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Download e-book for iPad: A Textbook of Agronomy by B. Chandrasekaran; K. Annadurai; E.Somasundaram

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

ISBN-10: 812242743X

ISBN-13: 9788122427431

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16. A. Mitsherlich (1909) proposed a theory of “Law of diminishing returns” states that, ‘The increase in any crop produce by a unit increment of a deficient factor is proportional to the decrement of that factor from the maximum and the response is curvilinear instead of linear’. Mitscherlich equation is dy/dx = C (A-Y) where, d – increment or change dy – amount of increase in yield dx – amount of increment of the growth factor x. 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.

3048 metre The uplift of the Himalayan system of mountain ranges was due to movements of two solid continental masses on two sides of the Tethys ocean, directed towards one another. The Central Asian 28 A TEXTBOOK OF AGRONOMY continental mass, Angaraland, slowly moved from the north to the south under pressure from the floor of the Arctic Ocean, and the northern edge of the Indian continental mass, the Gondwanaland, became down warped by the northward compressive force from the Indian Ocean. The Himalayan portion of the Tethys gradually shifted southward and became narrower, assuming its present trend in the early Eocene time.

8 per cent per annum. 3 per cent per annum due to high population growth rate. The FAO estimates clearly indicate the increasing shortage of cereals in 90 developing countries. Increase in food all over world during the decades of 1972–92 was remarkable. 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.

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

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