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

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The movement is caused by the convection currents that roll over in the upper zone of the mantle. This movement in the mantle causes the plates to move slowly across the surface of the Earth. Pangea broke up in four stages. In the first stage during the Triassic period about 200 million years ago, rifting occurred between Laurasia and Gondwanaland. Laurasia was made of the present day continents of North America (Greenland), Europe, Angara land comprising Russia, Siberia and China in the north.

These classics testify the knowledge and wisdom of the people of ancient period. D. ). Ancient Tamil and Kannada works contain lot of useful information on agriculture in ancient India. Agriculture in India made tremendous progress in the rearing of sheep and goats, cows and buffaloes, trees and shrubs, spices and condiments, food and non-food crops, fruits and vegetables and developed nature friendly farming practices. These practices had social and religious undertones and became the way of life for the people.

The method may vary according to the germination period and depending upon the crop establishment and what should be the optimum plant population. , for long duration rice (150-100–50 kg), for pulses N2, P and K. If the method of cultivation varies the nutrient content also varies. The time and method of applying nutrients must also be taken into account. ) foliage. 20 A TEXTBOOK OF AGRONOMY • Agronomist must select a better weed management practice. ; 2–4-D or cultural (by having wide space it may increase weed growth by using inter space crops).

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