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Journal articles on the topic 'Photoselective nets'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Arthurs, Steven P., Robert H. Stamps, and Frank F. Giglia. "Environmental Modification Inside Photoselective Shadehouses." HortScience 48, no. 8 (August 2013): 975–79. http://dx.doi.org/10.21273/hortsci.48.8.975.

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Shade nets are widely used to protect floricultural crops from excessive radiation, wind, hail, and birds. Although black nets are most frequently used, growers are experimenting with colored, gray, and white dispersive netting to impact vegetative vigor, dwarfing, branching, leaf variegation, and timing of flowering. We monitored environmental data inside replicated shadehouse structures (10 × 10 × 3 m high) with full covering of red, blue, pearl, and black nets (all 50% nominal shading factor) in central Florida over 12 months. Actual photosynthetically active radiation (PAR, μmol·m−2·s−1) was reduced most by black nets (55% to 60% shading factor depending on the season) and least under red nets (41% to 51%) with blue and pearl nets intermediate. Spectral analysis revealed blue nets had distinctive peaks at the blue (450 to 495 nm) and far-red beyond 750 nm. Red nets had a minor peak ≈400 nm and major transmittance beyond 590 nm. Pearl nets transmitted more light above 400 nm compared with black nets but did not otherwise alter spectral composition in the visible range. No nets had red/far-red (R/FR) ratios (600 to 700/700 to 800 nm) significantly greater than ambient (close to 1), whereas blue nets had a consistently lowest R/FR ratio of ≈0.8. Both ultraviolet-B and ultraviolet-A (280 to 400 nm) were reduced most by pearl nets and least by red nets. We also noted elevated temperatures and wind resistance (but not relative humidity) under colored and pearl nets compared with black, probably as a result of the different net porosities. Our study documents the different environmental modifications inside structures covered with black, colored, and photoneutral translucent nets, which will help predict or interpret specific plant responses.

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2

Serra, Sara, Stefano Borghi, Giverson Mupambi, Hector Camargo-Alvarez, Desmond Layne, Tory Schmidt, Lee Kalcsits, and Stefano Musacchi. "Photoselective Protective Netting Improves “Honeycrisp” Fruit Quality." Plants 9, no. 12 (December 4, 2020): 1708. http://dx.doi.org/10.3390/plants9121708.

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High temperatures, wind, and excessive sunlight can negatively impact yield and fruit quality in semi-arid apple production regions. Netting was originally designed for hail protection, but it can modify the light spectrum and affect fruit quality. Here, pearl, blue, and red photoselective netting (≈20% shading factor) was installed in 2015 over a commercial “Cameron Select® Honeycrisp” orchard. Our research objectives were to (1) describe the light quantity and quality under the colored nets compared to an uncovered control and (2) investigate the effect of Photoselective nets on “Honeycrisp” apple quality for two growing seasons. Light transmittance and scattering for each treatment were measured with a spectroradiometer, and samples for fruit quality analyses were collected at harvest. PAR (photosynthetic active radiation), UV, blue, red, and far-red light were lower underneath all netting treatments compared to an uncovered control. The scattered light was higher under the pearl net compared to other colors, while red and far-red light were lower under the blue net. For two consecutive years, trees grown under the photoselective nets intercepted more incoming light than the uncovered trees with no differences among the three colors. In both years, trees under red and blue nets had more sunburn-free (clean) apples than pearl and control. Red color development for fruit was lower when nets were used. Interestingly, bitter pit incidence was lower underneath red nets for both years. Other than red color development, “Honeycrisp” fruit quality was not appreciably affected by the use of netting. These results highlight the beneficial effect of nets in improving light quality in orchards and mitigating physiological disorders such as bitter pit in “Honeycrisp” apple.

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3

Boini, A., K. Bresilla, G. D. Perulli, L. Manfrini, B. Morandi, and L. Corelli Grappadelli. "Photoselective nets impact on apple fruit development." Acta Horticulturae, no. 1271 (February 2020): 321–26. http://dx.doi.org/10.17660/actahortic.2020.1271.44.

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4

Mudau, Ambani R., Puffy Soundy, and Fhatuwani N. Mudau. "Response of Baby Spinach (Spinacia oleracea L.) to Photoselective Nettings on Growth and Postharvest Quality." HortScience 52, no. 5 (May 2017): 719–24. http://dx.doi.org/10.21273/hortsci11875-17.

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Manipulation of microenvironments by means of photoselective nettings is widely used to improve the productivity and quality of high-value vegetables. The aim of this study was to investigate the effect of photoselective nettings on growth, productivity, and postharvest quality attributes of baby spinach. Baby spinach cv. Ohio was grown from seeds, and the trial was repeated. Plants were planted in an open field (control) and under closed nets, viz., black, pearl, yellow, and red nets. At harvest, baby spinach leaves were subjected to 4, 10, and 20 °C storage temperatures for 12 days. Crops grown under black nets and stored at 4 °C retained higher level of antioxidant activity (0.23 g·kg−1), whereas the least level of antioxidant activity was observed in baby spinach grown under red and yellow shade nets (0.01 g·kg−1). Similar trend was evident with flavonoid content where baby spinach leaves grown under black nets maintained high level of flavonoids at 4, 10, and 20 °C during storage period compared with other shade nets and the control. The study control showed a better potential in retaining antioxidant activity over red and yellow shade nets. Results showed that black shade nettings have the potential to reduce water loss, decay incidents, and maintain flavonoid content and antioxidant activity followed by pearl and yellow nets.

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5

Amorós-Jiménez, Rocco, María Plaza, Marta Montserrat, M. Ángeles Marcos-García, and Alberto Fereres. "Effect of UV-Absorbing Nets on the Performance of the Aphid Predator Sphaerophoria rueppellii (Diptera: Syrphidae)." Insects 11, no. 3 (March 5, 2020): 166. http://dx.doi.org/10.3390/insects11030166.

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Photoselective nets have proven to be effective for aphid pest control as they limit their dispersal ability. However, little is known on the impact of such nets on natural enemies of aphids. In this work, we study the effect of UV-absorbing nets on the syrphid fly Sphaerophoria rueppellii Wiedemann (Diptera: Syrphidae), a commercially available aphid biocontrol agent in Mediterranean horticultural crops. First, we released mature syrphid adults and evaluated density and dispersal of the resulting immatures in a turnip crop grown under either UV-blocking (Bionet) or standard net. Second, we assessed, under controlled conditions, the impact of UV radiation on fitness-related parameters, and on flight behavior of S. rueppellii adults. Results showed that, while syprhid immature density was higher, their dispersion was reduced under Bionet. UV-absorbing nets are known to influence the dispersion pattern of aphids, which may have indirectly conditioned the distribution of their predator S. rueppellii. On the other hand, the type of net had no influence on the performance of adults. We conclude that the use of photoselective nets and the release of syrphid predators such S. rueppellii are compatible strategies to be used in IPM aphid-control programs.

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6

Lopez-Marín, J., A. Galvez, G. Otalora, and F. M. del Amor. "Photoselective shade nets for pepper cultivation in southeastern Spain." Acta Horticulturae, no. 1252 (September 2019): 183–90. http://dx.doi.org/10.17660/actahortic.2019.1252.24.

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7

Boini, A., K. Bresilla, G. D. Perulli, L. Manfrini, L. Corelli Grappadelli, and B. Morandi. "Photoselective nets impact apple sap flow and fruit growth." Agricultural Water Management 226 (December 2019): 105738. http://dx.doi.org/10.1016/j.agwat.2019.105738.

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8

Bastías, R. M., P. Losciale, C. Chieco, F. Rossi, and L. Corelli-Grappadelli. "PHYSIOLOGICAL ASPECTS AFFECTED BY PHOTOSELECTIVE NETS IN APPLES: PRELIMINARY STUDIES." Acta Horticulturae, no. 907 (September 2011): 217–20. http://dx.doi.org/10.17660/actahortic.2011.907.32.

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9

Takeda, Fumiomi, D. M. Glenn, Ann Callahan, Janet Slovin, and Gary W. Stutte. "Delaying Flowering in Short-Day Strawberry Transplants with Photoselective Nets." International Journal of Fruit Science 10, no. 2 (June 11, 2010): 134–42. http://dx.doi.org/10.1080/15538362.2010.492331.

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10

Bastías, R. M., K. Ruíz, L. Manfrini, E. Pierpaoli, M. Zibordi, B. Morandi, P. Losciale, P. Torrigiani, and L. Corelli-Grappadelli. "EFFECTS OF PHOTOSELECTIVE NETS ON PHENOLIC COMPOSITION IN APPLE FRUITS." Acta Horticulturae, no. 939 (November 2012): 77–83. http://dx.doi.org/10.17660/actahortic.2012.939.9.

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11

Cordeiro Júnior, José J. F., Sávio D. L. Cavalcanti, Rayanne T. de A. Souza, Pedro H. D. Batista, and Cristiane Guiselini. "EFFECTS OF PHOTOSELECTIVE SHADE NETS ON EARLY GROWTH OF SUGARCANE SEEDLINGS." Engenharia Agrícola 40, no. 1 (February 2020): 10–15. http://dx.doi.org/10.1590/1809-4430-eng.agric.v40n1p10-15/2020.

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12

Corvalán, N., R. M. Bastías, C. Umanzor, and I. Serra. "Grapevine root and shoot growth responses to photoselective nets: preliminary results." Acta Horticulturae, no. 1136 (July 2016): 89–94. http://dx.doi.org/10.17660/actahortic.2016.1136.12.

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13

Legarrea, S., P. G. Weintraub, M. Plaza, E. Viñuela, and A. Fereres. "Dispersal of aphids, whiteflies and their natural enemies under photoselective nets." BioControl 57, no. 4 (December 2, 2011): 523–32. http://dx.doi.org/10.1007/s10526-011-9430-2.

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14

RT, Patil, Patil BC, Seetharamu GK, Mukund Shiragur, Sandhyarani Nishani, Ramanagoda SH, and Mahantesha NBN. "Influence of photoselective shade nets on growth and yield of Asparagus." International Journal of Chemical Studies 8, no. 6 (November 1, 2020): 2525–28. http://dx.doi.org/10.22271/chemi.2020.v8.i6aj.11151.

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15

Jokar, Ali, Hamid Zare, Abdolrasool Zakerin, and Abdolhossein Aboutalebi Jahromi. "Effects of Shade Net Colors on Mineral Elements and Postharvest Shelf Life and Quality of Fresh Fig (Ficus carica L.) under Rain-Fed Condition." Horticulturae 7, no. 5 (May 1, 2021): 93. http://dx.doi.org/10.3390/horticulturae7050093.

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Photoselective netting is well known for filtering the intercepted solar radiation, thus affecting light quality. While its effects on leaf mineral elements have been well investigated, how color netting affects fruit mineral nutrients remains elusive. This study was conducted to evaluate the effects of shade provided by blue and yellow nets on mineral nutrients of fig trees under rain-fed conditions. The experiment was arranged as a split-plot treatment in a randomized complete block design with three replications. Cultivars “Sabz” and “Siah” were covered with color nets or left uncovered (as the control group). The highest nitrogen content (8710 ppm) was recorded for cultivar “Sabz” covered with blue net. Color nets enhanced calcium concentration in cultivar “Siah”. Covering fig trees with yellow net increased magnesium content in cultivar “Siah” and phosphorus content in cultivar “Sabz”. Our observation showed the significant positive effect of photo selective nets on postharvest quality, by decreasing fig fruit weight loss and extending shelf life of fruits. In general, color nets as a new agro-technological approach can maintain fruit nutrition under rain-fed conditions and increase postharvest shelf life and quality of fresh fig.

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16

Ben-Yakir, D., Y. Antignus, Y. Offir, and Y. Shahak. "PHOTOSELECTIVE NETS AND SCREENS CAN REDUCE INSECT PESTS AND DISEASES IN AGRICULTURAL CROPS." Acta Horticulturae, no. 1015 (January 2014): 95–102. http://dx.doi.org/10.17660/actahortic.2014.1015.10.

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17

Mauta, D. S., F. J. Hawerroth, C. V. T. Amarante, C. S. Mota, and J. C. Vilvert. "Photosynthetic response of ‘Maxi Gala’ apple trees covered with photoselective anti-hail nets." Acta Horticulturae, no. 1268 (January 2020): 327–34. http://dx.doi.org/10.17660/actahortic.2020.1268.44.

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18

del Amor, F. M., A. Gálvez, M. Romero, G. Otalora, and J. López-Marín. "Preliminary study of the behavior of a courgette crop grown under photoselective shade nets." Acta Horticulturae, no. 1268 (January 2020): 341–45. http://dx.doi.org/10.17660/actahortic.2020.1268.46.

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19

Aoun, M., and K. Manja. "Impact of the use of photoselective nets on two apple cultivars in a Mediterranean orchard." Acta Horticulturae, no. 1286 (July 2020): 205–10. http://dx.doi.org/10.17660/actahortic.2020.1286.29.

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20

Nissim-Levi, Ada, Rinat Ovadia, Sima Kagan, and Michal Oren-Shamir. "Shading stock plants with photoselective nets affects the yield and rooting quality of their cuttings." Journal of Horticultural Science and Biotechnology 89, no. 6 (January 2014): 693–99. http://dx.doi.org/10.1080/14620316.2014.11513139.

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21

Ilić, Zoran S., Lidija Milenković, Ljubomir Šunić, and Maja Manojlović. "Color Shade Nets Improve Vegetables Quality at Harvest and Maintain Quality During Storage." Contemporary Agriculture 67, no. 1 (March 1, 2018): 9–19. http://dx.doi.org/10.2478/contagri-2018-0002.

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Summary The photoselective, light-dispersive shade nets can be used as an alternative to protect crops from adverse environmental conditions such as; excessive solar radiation, heat and drought stress, wind and hail, birds, flying pests, thus improving crop’s production, yield and quality. The physiological parameters discussed in the review include: vegetable growth parameters (leaf area, leaf chlorophyll), tissue structure, fruit ripening, physiological disorders, pest and disease incidence, fruit quality parameters (soluble solids content and titratable acidity), bioactive compounds (antioxidant activity, ascorbic acid, carotenoid and flavonoid contents) and aroma volatile compounds at harvest. Also, it is evident in the reviewed literature that light quality influences the biosynthesis, accumulation and retention of vegetable phytochemicals, as well as the decay development during storage. These new strategies to modulate light quality should be conveyed to vegetable producing farmers, thus allowing them to preserve the freshness and post-harvest quality of vegetables for an extended period of time, and to meet the consumers demand for vegetables with high nutritional value all year round. Research on light manipulation in horticultural systems is necessary for a sustainable and market-oriented open field and greenhouse vegetable production in the future.

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22

Kong, Y., L. Avraham, K. Ratner, and Y. Shahak. "RESPONSE OF PHOTOSYNTHETIC PARAMETERS OF SWEET PEPPER LEAVES TO LIGHT QUALITY MANIPULATION BY PHOTOSELECTIVE SHADE NETS." Acta Horticulturae, no. 956 (October 2012): 501–6. http://dx.doi.org/10.17660/actahortic.2012.956.59.

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23

Gálvez, Amparo, Alfonso Albacete, Francisco M. del Amor, and Josefa López-Marín. "The Use of Red Shade Nets Improves Growth in Salinized Pepper (Capsicum annuum L.) Plants by Regulating Their Ion Homeostasis and Hormone Balance." Agronomy 10, no. 11 (November 12, 2020): 1766. http://dx.doi.org/10.3390/agronomy10111766.

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The actual climate crisis scenario is aggravating the abiotic stress episodes that crop plants have to face. Salinity is one of the most important abiotic stresses directly impairing plant growth and productivity. Several strategies have been developed to minimize the negative effects of salinity in agricultural industry, mainly at the plant level, while management strategies, such us the control of microclimate conditions and light quality over plant canopy, have also been used. Indeed, shading plants with photoselective nets has been considered an efficient management strategy to modulate solar radiation to improve crop productivity. The aim of this work was to gain insights about the physiological factors underlying the salinity-alleviating effect of using red shading nets. For that, pepper plants (Capsicum annuum L.) were grown under control (0 mM NaCl) and moderate salinity (35 mM NaCl) conditions, with half of the plants covered with a red net (30% shading). The shoot growth impairment provoked by salinity was in part minimized by shading plants with red nets, which can be explained by their higher capacity to exclude Na+, control of K+ homeostasis and regulation of hormonal balance. Indeed, the concentrations of the most active cytokinin in pepper, trans-zeatin, as well as its metabolic precursor, zeatin riboside, increased in shaded plants, associated to shoot growth recovery and photosynthetic rate maintenance under salinity. Furthermore, the stress-related hormone abscisic acid (ABA) increased with salinity but in a lower extend in the plants shaded with red nets, suggesting a fine tune of stomata opening by ABA which, in crosstalk with salicylic acid increment, improved plant water relations. Likewise, the concentrations of gibberellins and the ethylene precursor, 1-aminocyclopropane-1-carboxylic acid, also changed during salinity stress in shaded plants but those changes were uncoupled of growth responses as indicated by the principal component analysis and thus they seem to play a minor role. Our data demonstrate that shading pepper plants with red nets is an efficient management strategy to modulate microclimate conditions at crop level thus controlling the ion homeostasis and hormonal balance of the plant to cope with salinity stress. This is especially important due to the actual and expected changes of the global climatic conditions.

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Giaccone, M., M. Forlani, and B. Basile. "TREE VIGOR, FRUIT YIELD AND QUALITY OF NECTARINE TREES GROWN UNDER RED PHOTOSELECTIVE ANTI-HAIL NETS IN SOUTHERN ITALY." Acta Horticulturae, no. 962 (October 2012): 287–93. http://dx.doi.org/10.17660/actahortic.2012.962.53.

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25

Candian, Valentina, Marco Giuseppe Pansa, Karin Santoro, Davide Spadaro, Rossella Briano, Cristiana Peano, Luciana Tavella, and Rosemarie Tedeschi. "First Multi-Target Application of Exclusion Net in Nectarine Orchards: Effectiveness against Pests and Impact on Beneficial Arthropods, Postharvest Rots and Fruit Quality." Insects 12, no. 3 (March 2, 2021): 210. http://dx.doi.org/10.3390/insects12030210.

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Over the past few years, there has been an increasing interest in the development of alternative pest control strategies to reduce environmental impact. In this contest, exclusion nets have been evaluated as a sustainable alternative to pesticides. In this study, the use of a photoselective exclusion net was investigated in semi-field conditions as a potential strategy to protect nectarine orchards from different pests (i.e., fruit moths, Halyomorpha halys and Drosophila suzukii) in NW Italy. The presence and abundance of pest populations inside and outside the net, as well as the damage they caused on fruits, were evaluated. Moreover, any possible effects of the net on beneficial arthropods, postharvest rots and fruit quality and nutraceutical parameters were considered. The exclusion net significantly reduced pest populations. At harvest, fruit damage caused by Grapholita molesta and H. halys in netted plots was reduced up to 90% and to 78%, respectively, compared with insecticide-treated plots. The exclusion net allowed the production of healthier fruits with a strong reduction of insecticide treatments (up to seven less) and of their related costs without any negative impact on postharvest rots, neither fruit quality nor nutraceutical properties.

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Stagnari, Fabio, Gabriele Campanelli, Angelica Galieni, Cristiano Platani, Aldo Bertone, and Nadia Ficcadenti. "Adaptive Responses to Nitrogen and Light Supplies of a Local Varieties of Sweet Pepper from the Abruzzo Region, Southern Italy." Agronomy 11, no. 7 (June 30, 2021): 1343. http://dx.doi.org/10.3390/agronomy11071343.

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Local varieties represent a heritage for plant biodiversity and, thanks to their resilience, are characterized by a better adaptation and rusticity to environmental variables. This work reports the morphological and physiological responses of a local ecotype of sweet pepper grown in Southern Italy, i.e., Altino, to N and light supplied at optimal and sub-optimal levels. In 2017, two open-field experiments were set up, comparing increasing N rates (0, 100 and 200 kg N ha−1, 0_N, 100_N and 200_N, respectively) and different percentages of shading and/or manipulations of the transmitted solar radiation, obtained through photoselective nets (red net, RN; black net, BN; unshaded Control). The unfertilized plants reduced growth (by 32% on average, at 83 days after transplanting, DAT), especially in terms of number of leaves, leaf area and effectiveness (chlorophyll content) of photosynthetic apparatus; no differences were recorded among fertilization treatments. On the other hand, the shading avoidance mechanisms resulted in higher biomass partitioned to leaves at the expense of sink organs, the building of more expanse (higher total leaf area) and thinner (higher specific leaf area and lower leaf-cuticular waxes) photosynthetic apparatus, and in a greater concentration of leaf pigments. The effects on yield and fruit quality of Altino ecotype deserve to be further explored.

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Nissim-Levi, A., R. Ovadia, I. Forrer, and M. Oren-Shamir. "SHADING ORNAMENTALS WITH PHOTOSELECTIVE NETS: AN ENVIRONMENTALLY FRIENDLY METHOD FOR INCREASING THE YIELD AND IMPROVING THE ROOTING OF CUTTINGS FROM MOTHER PLANTS." Acta Horticulturae, no. 1015 (January 2014): 163–68. http://dx.doi.org/10.17660/actahortic.2014.1015.18.

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28

Bonora, Alessandro, Enrico Muzzi, Cristiano Franceschini, Alexandra Boini, Gianmarco Bortolotti, Kushtrim Bresilla, Giulio Demetrio Perulli, Melissa Venturi, Luigi Manfrini, and Luca Corelli Grappadelli. "Preharvest Factors Affecting Quality on “Abate Fetel” Pears: Study of Superficial Scald with Multivariate Statistical Approach." Journal of Food Quality 2021 (June 1, 2021): 1–11. http://dx.doi.org/10.1155/2021/9921834.

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Although superficial scald (SS) is well characterized on apples, there are only a few insights concerning the influence that agronomic and management variability may have on the occurrence of this physiological disorder on pears. In this study, we aimed to improve our understanding of the effect of different preharvest factors on SS development using a multivariate statistical approach. Pears (Pyrus communis L.) cv “Abate Fetel” were picked during two consecutive seasons (2018-2019 and 2019-2020) from twenty-three commercial orchards from three growing areas (Modena, Ferrara, and Ravenna provinces) in the Emilia-Romagna region of Italy. Bioclimatic indices such as weather and soil, agronomic management such fertilization and irrigation, orchard features such as rootstock and training systems, and SS incidence were carried out at harvest and periodically postharvest in all producers. Two different storage scenarios (regular atmosphere and use of 1-MCP) were also evaluated. Our data in both seasons showed high heterogeneity between farms for SS symptoms after cold storage either in the regular atmosphere or with 1-MCP treatment. Nevertheless, in 2018, all the producers showed SS at the end of the storage season, but in 2019 some of them did not exhibit SS for up to 5 months. In fact, some preharvest factors changed considerably between the two seasons such as yield and weather conditions. Indeed, some factors seem to affect SS in both growing seasons. Some can increase its occurrences such as physiological and agronomical factors: high yields, late date of blooming, heavy downpours, improper irrigation management (low watering frequency and high volumes), nitrogen (included that deriving from organic matter), soil texture (presence of clay), orchard age, and canopy volume in relation to training system and rootstock. Others can decrease SS such as climatic and management factors: late harvest dates, rain, gibberellins, calcium, manure, absence of antihail nets or use of photoselective nets, and site (probably related to better soils toward the Adriatic coast). Initial preharvest variability is an important factor that modulates physiological plant stress and, subsequently, the SS after cold storage in “Abate Fetel” pears. Multivariate techniques could represent useful tools to identify reliable multiyear preharvest variables for SS control in pear fruit different batches.

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Abbasnia Zare, Seyedeh Khadijeh, Shahram Sedaghathoor, Mohammad-Naghi Padasht Dahkaei, Davood Hashemabadi, and Manuel Tejada Moral. "The effect of light variations by photoselective shade nets on pigments, antioxidant capacity, and growth of two ornamental plant species: Marigold (Calendula officinalis L.) and violet (Viola tricolor)." Cogent Food & Agriculture 5, no. 1 (January 1, 2019): 1650415. http://dx.doi.org/10.1080/23311932.2019.1650415.

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30

Gullo, Gregorio, Antonio Dattola, Vincenzo Vonella, and Rocco Zappia. "Effects of photoselective colour nets on the vegetative, productive, and qualitative behaviour of kiwifruit, jintao cultivar." Journal of Berry Research, January 5, 2021, 1–19. http://dx.doi.org/10.3233/jbr-200530.

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BACKGROUND: In the Mediterranean basin, the solar radiation received is very high for many tree species over several hours of the day during the summer. Using a photoselective net can improve the climatic conditions and also modify the quality of light received. OBJECTIVE: This study aimed to evaluate the influence of the colour of photoselective nets on the yield and quality of Actinidia chinensis. MATERIALS: The experiment was carried out in Southern Italy on an orchard of Jintao kiwifruit. Photoselective nets of different colours were used: black, red, yellow, white, and grey. The resulting fruits were compared to those of plants in the open field. A randomised block design was adopted. Environmental, vegetative, and leaf gas exchange parameters; yield; and fruit quality were defined. All data were analysed using the Variance Analysis (ANOVA) and the Principal Component Analysis (PCA). RESULTS: Photoselectivity influenced production. The best results were obtained under the red net in terms of production and fertility indices. Fruit size, maturation indices, and nutraceutical parameters were also higher under the red net. Among the nets, the grey net induced the worst tree productivity results and the worst fruit quality parameters. However, all nets showed better results compared to the open field. CONCLUSION: The photoselective net strongly influenced the yield and quality of Jintao kiwifruit and the better results compared to the open field. The red net proved to be the best performer for the environment where the experiment was carried out.

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Boini, Alexandra, Enrico Muzzi, Aude Tixier, Maciej Zwieniecki, Luigi Manfrini, and Luca Corelli Grappadelli. "Photoselective Nets Alter Apple Canopy Air Temperature and Carbon Translocation during Dormancy and Budbreak." HortScience, September 23, 2021, 1–9. http://dx.doi.org/10.21273/hortsci15545-20.

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Abstract:

Photoselective nets were used to examine apple shoot physiology during dormancy and budbreak. Two trials were conducted: one in the field and one in controlled conditions. In the first, three colored nets (red, blue, and white, shading 20%) covered sections of single trees, leaving an empty portion as control, from December to April. The white net increased canopy air temperature compared with the blue one. Differences were found in carbohydrate seasonal patterns; however, it appeared that soil temperature had higher impacts on sugar movement in the trees. No differences were found in bud phenology. In the second trial, cuttings were placed in boxes constructed with the same-colored nets and monitored from the end of February to April. Results showed differences in phenology and carbohydrate translocation. The white box hastened bloom and its cuttings had higher amounts of carbohydrates at the end of the trial. On the contrary, the blue box delayed bloom while resources were still being consumed and its cuttings had the lowest amounts of reserves at the end of the trial. These results add new insights on apple physiology under different light spectra and commercial applications should not be excluded for improving crop management.

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