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

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

ISBN-10: 812242743X

ISBN-13: 9788122427431

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3. 4. 5. 6. 7. 8. R. ) Theodore-de-Saussure : : : : : : : : Found the water as nutrient of plants Salt peter (KNO3) as nutrient and not water Fine soil particle as plant nutrient Discovered the oxygen Water, air, salts, fire and oil from the plant nutrients Isolated and characterized Indole -3- Acetic Acid (IAA) Developed the mould board plough. Found that plants absorb CO2 from air and release O2; soil supply N2 and ash to plants 9. ) : A German chemist developed the concept called “Liebig’s law of minimum”.

This tells us that South America and Africa were connected at one time. Today these two continents are separated by the Atlantic Ocean, which is over 2000 miles wide. AGRICULTURAL HERITAGE B. 135 million years ago OF INDIA 25 26 A TEXTBOOK OF AGRONOMY In the Jurassic period about 135 million years ago, Laurasia was still moving, and as it moved it broke up into the continents of North America, Europe and Asia (Eurasian plate). In the second stage, the Gondwana period continents separated from each other during the Jurassic and Cretaceous period.

In the 30 A TEXTBOOK OF AGRONOMY Rig-Veda, there is reference to hundreds and thousands of cows; to horses yoked to chariots; to race courses where chariot races were held; to camels yoked to the chariots; to sheep and goats offered as sacrificial victims, and to the use of wool for clothing. The famous Cow Sukta (Rv. 28) indicates that the cow had already become the very basis of rural economy. In another Sukta, she is defined as the mother of the Vasus, the Rudras and the Adityas, as also the pivot of immortality.

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

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