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Book (stand-alone)Plant nutrition for food security - A guide for integrated nutrient management 2006
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No results found.Of the essential material needs of humankind, the basic requirement is for an adequate supply of air, water and food. People have free access to the air they breathe. However, access to drinking-water and food, while easily obtained for some, is difficult for many. In addition to being physically available, these materials should also be of acceptable quality and continuously so. Hunger and diseases have affected humankind since the dawn of history. Throughout time, there have been p eriods of famine leading to suffering and starvation, making the fight against hunger and the diseases caused by malnutrition a permanent challenge. For many centuries until about 1800, the average grain yield was about 800 kg/ha, providing food only for a few people. The main problems were the low fertility of most soils (mainly caused by the depletion of nutrients) and the great yield losses from crop diseases and pests. -
Book (stand-alone)Integrated plant nutrition systems 1995
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No results found.The increasing pressure on the land of a fast-growing world population has made it necessary to intensify agricultural production. Efficient use of mineral fertilizers has proved to be a quick way of boosting crop yields per unit area of land; however, it must be realized that cost and other constraints frequently deter farmers from using them in adequate quantities and balanced proportions. -
Book (stand-alone)Soil and plant testing and analysis as a basis of fertilizer recommendations
FAO Soils Bulletin 38/2
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No results found.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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