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Development Of Site-Specific Fertilizer Management Systems For Sustainable Crop Production - TCP/SRL/3606









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    Book (stand-alone)
    Soil and plant testing and analysis as a basis of fertilizer recommendations
    FAO Soils Bulletin 38/2
    1980
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    General principles of plant nutrition don't furnish the concrete information, necessary for practical treatments in a given situation. Thus, the questions arise which parameters must be considered an how can they be determined. This leads to consider the concepts of nutrients diagnosis, as well as the methodology and the corresponding equipment and instrumentation, for putting it into practice. The question may arise whether plant or soil analysis should be used for diagnosis crop nutrient requ irements and making fertilizer recommendations.Both methods may be complementary, not competitive and the laboratories should be in the possibility to carry out both types analysis. It is recommendable to start soil analysis prior to plant testing.There are many possibilities and methods for testing soil chemical and nutrient properties. It is indeed highly recommended to agree on a minimum of uniformity of methodology.
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    Fertilizer use by crop in Egypt 2005
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    Agricultural land accounts for only 3.5 percent of the land area of Egypt. Two thirds of the agricultural land is alluvial soil, fertilized for thousands of years by the Nile floods, and one third is land recovered since the 1950s. Rainfall is minimal and almost all the agricultural land is irrigated. Soil salinity and water logging are important problems in the reclaimed areas. Sprinkler irrigation and drip irrigation are common on the recovered area and fertigation is used on 13 percent of the land. There are up to three harvests per year, the overall cropping intensity being 180 percent. Crop yields and rates of fertilizer use are relatively high. In order to provide for a large and increasing population, while economizing scarce resources and minimizing adverse environmental impacts, the efficiency of use of both fertilizers and water needs to be improved. Continuing efforts must be made to communicate information on the best practices to a generally receptive farmer audience. Farm ers’ Field Schools make an important contribution to the transfer of information.
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    Case studies on policies and strategies for sustainable soil fertility and fertilizer management in South Asia 2011
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    According to FAO's latest estimates, global food production needs to increase by 70 percent by 2050 to feed an additional 2.3 billion people. Projections indicate that about 80 percent of the gains in production will need to come from increased yield growth and cropping intensity on existing farmlands. Nutrient depletion of soils is a key constraint to boosting the productivity of small and marginal farmers in Asia and the Pacific, who are among the most food-insecure. Efficient fertilizer use i s vital to reversing this trend. Most soil fertility depletion is caused when disposable household income is too low for farmers to advance from low-input/low-output farming, resulting in nutrient mining. Serious efforts are required at national and regional levels to develop appropriate policies, technologies and capacities to address this challenge. Policies must ensure that soil fertility is not depleted in low-input systems while also helping to curb overuse of fertilizers that, in some case s, leads to serious damage to ecosystems. As part of FAO's mandate to develop a knowledge base in support of food security and rural livelihoods, the Regional Office for Asia and the Pacific commissioned national studies on fertilizer use in South Asia, which has the largest incidence of food insecurity in the region. The studies aim to identify gaps in prevailing strategies and policies, and make recommendations for improvement. This book contains four case studies from Bangladesh, Nepal, Pakis tan and Sri Lanka, and a chapter on guidelines for fertilizer demand assessment and forecasting.

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