Titlebook: Handbook on Environmental Aspects of Fertilizer Use; N Centre D’étude de L’Azote (CEA),P International Book 1983 Martinus Nijhoff / Dr W.

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Introduction, desirable standard — these standards must be raised. Both these requirements entail increasing agricultural production. Food sypply is not the only concern. The products of agriculture include many other necessities: raw materials for industry which contribute to economic welfare. This aspect is ve

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A Food, fibre and fertilizers,0” in 1979. In the past twenty years world population had increased from 3 billion to approximately 4 1/2; by the end of the century it would be more than 6 billion. Even to feed the people at present average standards, and we know that these standards are far from adequate in many parts of the worl

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Social and environmental benefits of fertilizers,ying fertilizer. An example from Denmark (Table B 1.1) shows the increases in production resulting from the use of optimum rates of N fertilizer, with costs and gross returns. No allowance is made for the extra value of the increased protein content of the crops.

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Crop quality,e not necessarily interrelated. Thus a product which is regarded as having good compositional qualities will not necessarily be of a high quality for processing, and so on. Equally, external factors such as soil, climate and methods of cultivation and postharvest handling will not necessarily affect

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The effect of fertilizers on forage crops and animal health,tions, as in the lowland areas of temperate zones, suit the socalled “agriculturally-valuable” species such as perennial ryegrass (Lolium perenne), Italian ryegrass (Lolium italicum), timothy (Phleum pratense), cocksfoot (Dactylis glomerata), meadow fescue (Festuca pratensis) and tall fescue (Festuc

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Fertilizers and the soil,ntent, its structure, its ability to supply water and its depth. It has been said that fertilizers, though they stimulate crop yield, do nothing to bring about improvement in soil fertility. A few have even said that using fertilizers may cause soil fertility to deteriorate. There are no grounds for

Inveterate

Water Quality,t from the soil/crop system by one or more of a number of mechanisms. The relative amounts following these different pathways, and in particular the amount reaching surface or underground water, vary between nutrients and also with soil, climatic and agricultural circumstances.

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Energy,fuels) and, in some cases, from developing nuclear sources. Traditional agriculture relies mainly on freely available and renewable energy sources, but more intensive agricultural systems consume increasing quantities of finite fossil fuels. As a result, land and declining labour resources are more