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Production Practices and Quality Assessment of Food Crops - Plant Mineral Nutrition and Pesticide Management (Hardcover, 2004 ed.)
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Production Practices and Quality Assessment of Food Crops - Plant Mineral Nutrition and Pesticide Management (Hardcover, 2004 ed.)
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Plants require nutrients in order to grow, develop and complete
their life cycle. Mineral fertilizers, and hence the fertilizer
industry, constitute one of the most imp- tant keys to the world
food supplies. There is growing concern about the safety and
quality of food. Carbon, hydrogen and oxygen, which, together with
nitrogen, form the structural matter in plants, are freely
available from air and water. Nitrogen, phosphorus and potassium,
on the other hand, may not be present in quantities or forms
sufficient to support plant growth. In this case, the absence of
these nut- ents constitutes a limiting factor. The supply of
nutrients to the plants should be balanced in order to maximise the
efficiency of the individual nutrients so that these meet the needs
of the particular crop and soil type. For example, it should be
noted that EU-wide regulations are not designed to govern the
specific details of mineral fertilizer use. Although plants receive
a natural supply of nitrogen, phosphorus and potassium from organic
matter and soil minerals, this is not usually sufficient to satisfy
the demands of crop plants. The supply of nutrients must therefore
be supplemented with fertilizers, both to meet the requirements of
crops during periods of plant growth and to replenish soil reserves
after the crop has been harvested. Pesticides are important in
modern farming and will remain indispensable for the foreseeable
future.
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