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• W1992088986 abstract "Abstract The necessity for precision nutrient management has arisen from a decline in agricultural commodity prices, the advent of new technology, and demographic changes resulting in increased urbanization. Community perceptions and attitudes to agriculture, food quality and the environment are often negative: thus management of essential and beneficial nutrients as well as agriculturally undesirable ions is progressing at a more rapid pace than would be dictated by economic and technological factors alone. Some of the main agronomic reasons for developing precision nutrient management are: the potential for ground water pollution particularly nitrate; heavy metal pollution; salinity including rising water tables; nutrient run‐off into streams and rivers from cropping, pastoral, intensive livestock and horticultural enterprises; suitable crop, pasture or other ground cover to minimize soil erosion; and the introduction of new cultivars of plants. Opportunities for developing more precise nutrient management abound but they need to be targeted to a particular industry or enterprise. These opportunities include soil‐less agriculture, inert matrix agriculture, timing of fertilizer applications, nutrient supply in relation to demand and nutrient availability, nutrient cycling, foliar fertilizers, development of compounds to promote translocation, exploiting nutrient interactions, location of agricultural enterprises, water management, decision support systems and selection of genotypes of a crop which are nutrient efficient and effective. Precise nutrient management in most situations can only be achieved with sound, regular soil and plant analyses. Theory can play a substantial role in improving nutrient management. Basic ion uptake studies can provide information on the genetic potential of a crop's nutrient quality and on nutrient limitations. They can also provide an means of calculating the nutrient requirements of a crop or pasture. Estimates of nutrient requirements can also be made from desired yields particularly, if growth rates are known for that environment. Nutrient balance (ratios) and interactions between nutrients also provide a basis for improved management procedures. Further developments are needed for translocation, demand functions for nutrients at particular times, and root/shoot ratios during crop growth. At a field level, development must occur on equipment to deliver and place nutrients precisely; rapid, effective scanning of soils to monitor the local nutrient status rather than relying on extensive sampling; plant responses in the field to single nutrient and multiple nutrient fertilizers to assess the interactive components of nutrition; and training of personnel who have excellent interpretative skills in plant and soil analyses. Notes Visiting Professor of Plant Nutrition, Department of Soil, Crop and Atmospheric Sciences, Cornell University, Ithaca, NY 14853." @default.
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• W1992088986 title "Beneficial impact of precision nutrient management on the environment and future needs" @default.
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