A Textbook of Agronomy by B. Chandrasekaran; K. Annadurai; E.Somasundaram

By B. Chandrasekaran; K. Annadurai; E.Somasundaram

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Wilcox (1929) proposed “Inverse Yield–Nitrogen law” states that, the growth and yielding ability of any crop plant is inversely proportional to the mean nitrogen content in the dry matter. 18. Macy (1936): Proposed a concept of “Critical Percentages of Plant Nutrients”. He suggested a relationship between the sufficiency of nutrients and plant response in terms of yield and nutrient concentration of plant tissues. Macy proposed critical percentages for each nutrient in each kind of plant. In the tissues minimum percentage range, an added increment of a nutrient increases the yield but not the nutrient percentage.

Like agriculture, agronomy is an integrated and applied aspect of different disciplines of pure sciences. Agronomy has three clear branches namely, (i) Crop Science, (ii) Soil Science, and (iii) Environmental Science that deals only with applied aspects. ,) Soil-Crop-Environmental relationship. , and environmental science which includes meteorology and crop ecology. Basic Principles • Planning, programming and executing measures for maximum utilization of land, labourer, capital and other factors of production.

The 21st century must inherit a food and agricultural system in the developing countries which is much more productive and equitable than it is now. By of continuously absorbing further innovations. The foundations for enormous increase in output needs in the first part of the 21st century must, therefore, be laid in what is left of this century. Attaining the targets proposed for this later period is a pre-requisite for improving the lives not only of those now living but also of further generations.

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