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Letteratura scientifica selezionata sul tema "Chókwè agricultural research station"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 febbraio 2022

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Articoli di riviste sul tema "Chókwè agricultural research station"

1

Debertin, David L., e Garnett L. Bradford. "Agricultural Economics Research and The Experiment Station System". Journal of Agricultural and Applied Economics 19, n. 2 (dicembre 1987): 195–201. http://dx.doi.org/10.1017/s0081305200025462.

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AbstractThis paper discusses the role of agricultural economics research within the land-grant university system. Fundamental differences between research in the biological sciences and the social sciences are delineated. Implications of these differences for experiment station research programs are discussed. Recommendations are made which have potential for enhancing the role of agricultural economics within colleges of agriculture.

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EISAWY, GAMAL I. "CONSTRAINTS OF AGRICULTURAL TECHNOLOGY TRANSFER AS PERCEIVED BY RESEARCHERS IN SAKHA AGRICULTURAL RESEARCH STATION". Egyptian Journal of Agricultural Research 98, n. 3 (1 dicembre 2020): 1189–215. http://dx.doi.org/10.21608/ejar.2020.177837.

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EISAWY, GAMAL I. "CONSTRAINTS OF AGRICULTURAL TECHNOLOGY TRANSFER AS PERCEIVED BY RESEARCHERS IN SAKHA AGRICULTURAL RESEARCH STATION". Egyptian Journal of Agricultural Research 89, n. 3 (1 settembre 2011): 1189–215. http://dx.doi.org/10.21608/ejar.2011.177858.

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4

Bhatt, Rajan, e Paramjit Singh. "Soil Fertility Status of Punjab Agricultural University Regional Research Station Kapurthala". Agricultural Research Journal 57, n. 2 (2020): 260. http://dx.doi.org/10.5958/2395-146x.2020.00039.3.

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Connor, Larry J. "A Case Study of Research Prioritization in an Agricultural Experiment Station". Journal of Production Agriculture 4, n. 4 (ottobre 1991): 635–39. http://dx.doi.org/10.2134/jpa1991.0635.

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6

Richards, G. E., e Martha Davis. "Scientist Involvement in Research Funding at the Arkansas Agricultural Experiment Station". Journal of Production Agriculture 3, n. 4 (ottobre 1990): 602–5. http://dx.doi.org/10.2134/jpa1990.0602.

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Ryan, John, Colin Norwood e Juergen Diekmann. "Features of an Experimental Station at an International Agricultural Research Center that Enhance Regional Impact". Sustainable Agriculture Research 1, n. 2 (15 luglio 2012): 88. http://dx.doi.org/10.5539/sar.v1n2p88.

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<p>Adequately equipped field stations are essential for any institution involved with applied agricultural research. The field station is particularly crucial to the functioning of the network of global international research centers. The International Center for Agricultural Research in the Dry Areas addresses issues mainly related to dryland cropping system of the West Asia and North Africa region. It extends its effectiveness in northern Syria through a range of sub-stations and on-farm sites across the rainfall transect (150-600 mm). This article describes the environment and management of the Center that backstops its applied and adaptive research. Particular strengths of the station are highlighted. Unique features of the station that further the technology generation and transfer are described. While some aspects of international research station management are generic, there are considerations described that are specific to an evolving dryland research center in a rapidly changing region.</p>

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COHN, JEFFREY P. "Biosphere 2: Turning an Experiment into a Research Station". BioScience 52, n. 3 (2002): 222. http://dx.doi.org/10.1641/0006-3568(2002)052[0218:btaeia]2.0.co;2.

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Clark, E. Ann, B. R. Christie e S. F. Weise. "The structure and function of agricultural research". Canadian Journal of Plant Science 76, n. 4 (1 ottobre 1996): 603–10. http://dx.doi.org/10.4141/cjps96-108.

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Contemporary agricultural research is founded upon short-term controlled studies to examine, screen, and rank performance of genetic improvements or managerial processes. This approach has performed admirably in support of the resource-intensive, high-yield paradigm which has guided agricultural development since the second World War. Changes to this paradigm, which may occur in response to economic, societal, or environmental issues, may require increased emphasis on farm-based, system-oriented research to complement the experiment-station-based research which has proven so successful to date. Corresponding changes to the form, structure, intent, and ultimately, the beneficiaries of agricultural research are discussed. Key words: Long-term research, perennial forages, high-yield agriculture, on-farm research, fanning systems research, profitability, genotype × environment interactions, stability, adaptability

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Swallow, Stephen K., e Marisa J. Mazzotta. "Assessing Public Priorities for Experiment Station Research: Contingent Value and Public Preferences for Agricultural Research". American Journal of Agricultural Economics 86, n. 4 (novembre 2004): 975–89. http://dx.doi.org/10.1111/j.0002-9092.2004.00647.x.

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Tesi sul tema "Chókwè agricultural research station"

1

McGinley, Susan. "The V Bar V Ranch: An Agricultural Experiment Station for Northern Arizona". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/622323.

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Patterson, R. G. "A study of the soils and agronomy of a high country catchment". Lincoln University, 1993. http://hdl.handle.net/10182/1315.

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This study was undertaken to research the principles and practices behind increased pasture productivity on Longslip Station, Omarama. A range of landscape - soil - climate - plant systems were identified, then analysed and the legume responses measured. By isolating cause and effect and appreciating the driving variables of each system, lessons learnt could be reliably and objectively transferred to the rest of the farm. Extrapolation to the balance of the property (15,150 ha) permitted immediate large-scale development and engendered confidence to lending institutions, Lands Department, catchment authorities and ourselves. Soil (land) cannot be well managed and conserved unless it is mapped reliably and its characteristics measured and interpreted by skilled observers (Cutler, 1977). Soil resource surveys, and their interpretation, are an essential ingredient of rational resource evaluation and planning. This thesis is a figurative and comparative survey and study of the soil catenary bodies, resident vegetation, legume establishment and pasture production characteristics of a 400 hectare catchment, in relation to, and as influenced by soil landscape unit, slope component, altitude, aspect and time. The inherent diversity in landform, soil properties and vegetation communities in a single catchment in the high country has not previously been fully studied or appreciated. This has lead to blanket recommendations for fertilizer, seed and management regimes both within and between properties and even regions. This study reports on the diversity of, yet predictable change in soil properties with slope position (upper, middle and lower) aspect and altitude in terms of both soil physical properties e.g. soil depth and water holding capacity and soil chemical properties such as pH, BS%, %P, %S, %N and %C. The composition of the resident vegetation and its differential response to oversowing and topdressing and subsequent change through time is reported and discussed. Finally an epilogue gives an insight into the problems and frustrations of farming practices in the high country from a motivation and personal perspective and political point of view that it is essential to come to terms with.

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Maculuve, Tomas Valente. "Improving dryland water productivity of maize through cultivar selection and planting date optimization in Mozambique". Diss., 2012. http://hdl.handle.net/2263/26450.

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Mozambique is a semi-arid area with unreliable rainfall distribution; therefore optimal planting dates are critical to ensure that maize is not stressed during critical stages. The objective of this research was to study the effect of sowing date and cultivar on maize (Zea mays L.) yields in Mozambique. A further objective was to establish whether the SWB model could be utilized to help select the optimum planting window for different maize cultivars and localities. An experiment was conducted during the 2007/08 season at the Chókwè Agricultural Research Station, Mozambique, in which a short (or early cultivar, Changalane) and long (or late) season maize cultivar (Tsangano) were sown on three different dates: 5 December 2007 (PD1), 25 December 2007 (PD2) and 15 January 2008 (PD3). Sowing date had a significant effect (p<0.05) on yield and yield components. The 25 December planting (PD2) out yielded (4.3 t ha-1) the 5 December (PD1) (2.5 t ha-1,) and 15 January (PD3) (1.5 t ha-1) plantings for cv. Changalane. However, for cv. Tsangano, PD1 (3.2 t ha-1) out yielded PD2 (2.3 t ha-1) and PD3 (0.7 t ha-1). Cultivars varied significantly in yield potential. The most responsive cultivar to water supply was Changalane, which when planted late in December (PD2), gave a water productivity (WP) of 17 kg ha-1 mm-1, while Tsangano, the late cultivar, performed better when planted early in December (PD1), with a WP of 8.5 kg ha-1 mm-1 The Soil Water Balance (SWB) model was calibrated on the data from one planting date per cultivar and successfully validated on independent data sets from the other two planting dates. Long-term historical weather data sets were obtained for Chókwè and Umbeluzi, two important dry land maize production areas in Mozambique. The calibrated SWB model was used to simulate maize yields for different planting dates to establish the best planting date for different cultivar x plant date x soil combinations. Simulation results for the two cultivars across three planting dates showed that the simulated grain yields per planting date varied substantially from year to year and between the two sites. The SWB scenario simulation results showed that for both Umbeluzii and Chókwè sites, in four out of five years, best yields can be achieved by planting Changalane late in December and Tsangano early in December. It can be concluded that the SWB model can be a very useful tool to help select the most suitable maize cultivars and planting dates for different localities, based on differences in plant water availability during the growing season. Copyright
Dissertation (MSc(Agric))--University of Pretoria, 2012.
Plant Production and Soil Science
unrestricted

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"2005 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006. http://hdl.handle.net/10150/622185.

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"2003 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004. http://hdl.handle.net/10150/622221.

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"2002 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/622236.

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"2000 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/622269.

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"1999 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/622286.

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"1998 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/622299.

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"1997 Agricultural Experiment Station Research Report". College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998. http://hdl.handle.net/10150/622313.

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Più fonti

Libri sul tema "Chókwè agricultural research station"

1

Station, Chitedze Agricultural Research. Chitedze Agricultural Research Station: Station guide, 1999. Lilongwe, Malawi: The Station, 1999.

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Station, Chitedze Agricultural Research. Highlights and guide to research activities at Chitedze Agricultural Research Station. Lilongwe, Malaŵi: The Station, 1988.

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McLean, Alastair. Kamloops Range Research Station, 1928-1985. [Ottawa]: Research Branch, Agriculture Canada, 1986.

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Trulove, Susan. 1886-1986, Virginia's Agricultural Experiment Station: 100 years of research. Blacksburg, Va: Virginia Agricultural Experiment Station, 1986.

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Trulove, Susan. 1886-1986, Virginia's Agricultural Experiment Station: 100 years of research. Blacksburg, Va: Virginia Agricultural Experiment Station, 1986.

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Freeman, Jack A. Agassiz Research Station, 1886-1986. [Ottawa]: Agriculture Canada, 1986.

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Summerland Research Station, 1914-1985. [Ottawa: Research Branch, Agriculture Canada], 1986.

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A history of the Ohio Agricultural Experiment Station, 1882-1997. Akron, Ohio: Midwest Press, 1997.

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9

Haney, Robert L. Milestones marking ten decades of research. [College Station]: Texas Agricultural Experiment Station, 1989.

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A century of research: Centennial history of the Arkansas Agricultural Experiment Station. Fayetteville, Ark: The Station, 1989.

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Capitoli di libri sul tema "Chókwè agricultural research station"

1

Holt, Donald A. "Agricultural Research Management in US Land-Grant Universities – The State Agricultural Experiment Station System". In Agricultural Research Management, 231–58. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6057-1_12.

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Majumdar, Kaushik, Robert M. Norton, T. Scott Murrell, Fernando García, Shamie Zingore, Luís Ignácio Prochnow, Mirasol Pampolino et al. "Assessing Potassium Mass Balances in Different Countries and Scales". In Improving Potassium Recommendations for Agricultural Crops, 283–340. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59197-7_11.

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AbstractEstimating nutrient mass balances using information on nutrient additions and removals generates useful, practical information on the nutrient status of a soil or area. A negative input–output balance of nutrients in the soil results when the crop nutrient removal and nutrient losses to other sinks become higher than the nutrient inputs into the system. Potassium (K) input–output balance varies among regions that have different climates, soil types, cropping systems, and cropping intensity. This chapter illustrates the farm-gate K balances in major production areas of the world and their impacts on native K fertility and crop yields. On-farm and on-station research examples show significant negative K balances in South Asia and Sub-Saharan Africa, while China, the USA, Brazil, and countries of the Latin America Southern Cone highlighted continued requirement of location-specific K application to maintain crop yields and soil K fertility status at optimum levels.

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"The Moray Agricultural Research Station Theory". In Moray, 94–113. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/9780784410790.ch08.

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Sauer, Richard J., e Carl E. Pray. "Mobilizing Support for Agricultural Research at the Minnesota Agricultural Experiment Station". In Policy for Agricultural Research, 211–33. CRC Press, 2019. http://dx.doi.org/10.1201/9780429301940-9.

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Flora, Jan L. "History of Wheat Research at the Kansas Agricultural Experiment Station". In The Agricultural Scientific Enterprise, 186–205. Routledge, 2019. http://dx.doi.org/10.4324/9780429308772-15.

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JAUHAR, PREM P. "Recent Cytogenetic Studies of the Festuca–Lolium Complex* *Cooperative investigations of the USD A-Agricultural Research Service and the Utah Agricultural Experiment Station, Logan, Utah 84322, USA. Approved as paper No. 3650." In Developments in Plant Genetics and Breeding, 325–62. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88260-8.50023-9.

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BECKETT, J. B. "Cytogenetic, Genetic and Plant Breeding Applications of B–A Translocations in Maize† †Cooperative investigation between the US Department of Agriculture, Agricultural Research Service, and the University of Missouri Agricultural Experiment Station; journal series no. 10487." In Chromosome Engineering in Plants: Genetics, Breeding, Evolution, Part A, 493–529. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88259-2.50029-1.

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Bondareva, Olga, e Vladimir Vashchenko. "SELECTION OF GRAINS IN CONDITIONS OF UNSTABLE HUMIDIFICATION OF THE NORTH-EASTERN STEPPE OF UKRAINE". In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-37.

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The purpose of the research is to develop a system of methods for assessing the adaptability of the selection material of spring barley and winter wheat, to create varieties with a high yield potential in conditions of unstable moisture. During 2016-2020, the Donetsk State Agricultural Science Station of the National Academy of Sciences of Ukraine conducted research in the direction of creating high-yielding varieties of soft winter wheat and spring barley, adapted to the conditions of the northeastern region of Ukraine. The research was carried out according to the method of field work by B. A. Dospekhov and the method of state variety testing of agricultural crops. Research methods: general scientific, field, laboratory, statistical. Based on the analysis of the biological potential of the productivity elements of spring barley, the parameters of the promising variety were determined. A method for assessing the adaptability of spring barley breeding material when grown in conditions of unstable moisture has been developed. The highest yield was formed by the varieties Stalyy, Bravyy and Repriz – 3,74 t/ha, 3,78 t/ha and 3,74 t/ha, respectively (standard variety Stalker – 3,12 t/ha). To obtain highly productive genotypes of winter wheat in drought-resistant conditions of the Donetsk region, the selection of forms was carried out, the selection of forms was carried out on the basis of early earing According to the results of competitive variety testing of winter wheat, the best hybrid combinations were gk784/1 x Povaha and gk94 / 117 x Dosvid, which formed the grain yield 7,52 and 7,77 t/ha, that is, they exceeded the standard Donetskaya 48 (6,78 t/ha) by 0,74 and 0,99 t/ha. Two samples were identified according to the indicator of early maturity gk491 (gk704 / 1 x Povaha) and gk598 (Lan25 x gk789/1), which vikoloshuyut 2-4 days earlier than the standard Donetskaya 48 and during three years of study stably showed this sign.

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Kopp, Peter A. "Hop Center of the World". In Hoptopia. University of California Press, 2016. http://dx.doi.org/10.1525/california/9780520277472.003.0006.

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In the first decade of the twentieth century, Oregon became the leading hop producer in the United States, with the Willamette Valley contributing millions of pounds of hops to the world’s brewers. The region claimed to be the Hop Center of the World. This chapter explains how those in the industry sought to professionalize by connecting with local and international brewers, including Ireland’s Guinness Brewery, and international hop distribution companies. Additionally, industry leaders championed the region’s hops as the finest in the world and benefitted from the emergence of a hop research program at the Agricultural Experiment Station in Corvallis.

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HAUNOLD, ALFRED. "Cytology and Cytogenetics of Hops* *Contribution of the U.S. Department of Agriculture, Agr. Research Service, in cooperation with the Agricultural Experiment Station, Oregon State University, Technical paper No. 8092." In Developments in Plant Genetics and Breeding, 551–63. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88260-8.50034-3.

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Atti di convegni sul tema "Chókwè agricultural research station"

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Mahmoudi, Ahmed El, Yousef Al-Molhem e Adel Hussein. "AGRICULTURAL GEOPHYSICAL IMPLICATIONS AT THE AGRICULTURAL AND RESEARCH STATION OF KFU, AL HASSA, KSA". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.4133/sageep.27-023.

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Mahmoudi, Ahmed El, Yousef Al-Molhem e Adel Hussein. "AGRICULTURAL GEOPHYSICAL IMPLICATIONS AT THE AGRICULTURAL AND RESEARCH STATION OF KFU, AL HASSA, KSA". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2014. Society of Exploration Geophysicists and Environment and Engineering Geophysical Society, 2014. http://dx.doi.org/10.1190/sageep.27-023.

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Martinez, Edda. "Agricultural experiment station research collection: A centenary legacy of biodiversity". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.95431.

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ASGHARIPOUR, MOHAMAD, e ALIREZA KOCHEKI. "USING ENTROPY FOR QUANTIFYING SUSTAINABILITY IN AGRICULTURAL SYSTEMS: A CASE STUDY IN TOROGH RESEARCH STATION". In Proceedings of the 3rd Dubrovnik Conference. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812771285_0006.

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El Mahmoudi, A., Y. Al-Dakheel, A. Hussein e M. Massoud. "Two Dimensional Geoelectrical Imaging of the Hardpan Layer at the Agricultural and Research Station of KFU, Al Hassa, KS". In First International Conference on Engineering Geophysics. Netherlands: EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20143979.

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El Mahmoudi, Ahmed S., Yosef Y. Al-Dakheel, Adel H. Hussein e Massoud A. Massoud. "TWO DIMENSIONAL GEOELECTRICAL IMAGING OF THE HARDPAN LAYER AT THE AGRICULTURAL AND VETERINARY TRAINING RESEARCH STATION OF KFU, AL HASSA, KSA". In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013. Environment and Engineering Geophysical Society, 2013. http://dx.doi.org/10.4133/sageep2013-180.1.

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Zeleňáková, Martina, Pavol Purcz e Helena Hlavatá. "Trend Detection in Precipitation Data in Climatic Station". In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.096.

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Trends and changes in precipitation extremes have been a focus of research over the past decade. Observations show that changes are occurring in the amount, intensity, frequency and type of precipitation. Climate variability has created the need to study subsequent changes in hydroclimatic variables (e.g. rainfall, streamflow and evapotranspira-tion) to understand the regional effects of climate change. Mainly agricultural activities and water management activi-ties – water supply, urban drainage, and hydraulic structures management are patterned according to rainfall seasonality. Trend detection in precipitation time series is crucial for water resources management. Many researchers all over the word have investigated hydrologic variables trends at various temporal scales. In this paper we investigate the trends in precipitation time series in climatic station Košice, Slovakia in the period 1981–2013. We address the topic of trend detection in precipitation time series combining novel and traditional tools in order to simultaneously tackle the issue of seasonality and interannual variability, which usually characterize natural processes. The analysis proves that, in the case study area, statistically significant trends in precipitation have been undergoing in the last decades, although they have no significant impacts on water resources.

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Kosolapov, Vladimir, Sergey Saprykin, Iosif Ivanov e Anna Chekmareva. "Voronezh experimental station for perennial herbs — 100 years: the main results and prospects of work". In Multifunctional adaptive fodder production23 (71). ru: Federal Williams Research Center of Forage Production and Agroecology, 2020. http://dx.doi.org/10.33814/mak-2020-23-71-9-21.

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In 2020, the Voronezh experimental station for perennial grasses will celebrate its 100th anniversary. The article presents the history of the station's creation, its achievements, and shows the role of well-known agricultural scientists who took part in the establishment of the station and the organization of scientific work. The stages and directions of scientific research in different periods are highlighted.

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Draghici, Reta, Iulian Draghici, Aurelia Diaconu, Mihaela Croitoru e Milica Dima. "SIGNIFICANT PROGRESS ACHIEVED IN COWPEA BREEDING IN ROMANIA". In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/42.

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Climate change has led to drought, the expansion of desertification, loss of wetlands, loss of biodiversity, declining agricultural output and productivity. In the area of sandy soils in the southwest of Romania, where, compared to the multiannual average, the average air temperature in the May-August period increased by 1.010C and the precipitations recorded insignificant increases (5.97 mm), being very low (227. 82 mm) and unevenly distributed in relation to plant requirements. In these conditions, it is necessary to cultivate some species of plants resistant to drought and to preserve and improve some genetic resources adapted to the arid climate. For the efficient use of the microclimate in the sandy soils areas at the Dabuleni Research & Development Station for Plant Culture on Sands, three genotypes of Aura 26, Ofelia, Doljana were developed, which were studied in a comparison comparative culture with Jiana variety. The production potential of the new varieties (2120-2706 kg / ha) was clearly superior to the control variety, the production differences being significant and very significant.

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Morris, Anthony Edward, C. S. Wei, Runar Unnthorsson e Robert Dell. "Heat Transfer Analysis of Shell-and-Helical-Coil Heat Exchangers". In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-68173.

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Abstract (sommario):

Since 2006, The Center for Innovation and Applied Technology (CIAT) at Cooper Union for the Advancement of Science and Art has been developing a system to use thermal pollution to heat the growth medium of green roofs. CIAT is researching various apparatus and techniques, including shell-and-tube and shell-and-coil heat exchangers, to improve its heated ground agricultural projects. There are limited recorded observations on shell-and-coil heat exchangers; therefore a laboratory work station was created of interchangeable components to test the efficiency of a variety of coil designs. This paper discusses the data collected on temperature, pressure, and flow rates for a straight tube and two different helical coils. The analysis of this data indicates the superiority of a helical coil design when compared to a straight tube design with respect to both rating and heat transfer rate. The same data analysis has lead to preliminary observations on how the contour properties of a helical coil influence the heat transfer rate through a coil. The authors intend to further this helical coil research to develop a useful mathematical model for determining efficient designs for shell-and-coil heat exchangers.

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