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

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

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D. sounds daunting. To meet satisfactorily the food and agricultural demands of about 10 billion people, taking in to account the non-agricultural use of the land and seas, will require at least indicative global source use planning. It is clear that sustained rapid increase in crop and livestock yields must be the main stay of future output growth. A continuation to the middle of the 21st century of the expansion of arable land for the next 20 years would mean that virtually all of the potential arable land would be cultivated.

A – Maximum possible yield Y – Yield obtained for the given quantity of factor ‘x’ and C – Proportionality constant that depends on the nature of the growth factor. 17. 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.

Productivity and production in the technologically advanced agriculture of the developed countries rose to heights that would have been unbelievable half a century ago, mainly due to introduction of high yielding varieties (HYVs) responsive to inputs of fertilities and irrigation water, besides increase in area under cultivations. Developing countries presented a different picture. Only about a third of their population (excluding China) lived in countries with satisfactory performance in agricultural production.

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