By B. Chandrasekaran; K. Annadurai; E.Somasundaram
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Extra resources for A Textbook of Agronomy
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. The backup of agricultural research and extension must be more oriented to the problem of developing country agriculture. 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.
The Cenozoic Era that followed the Mesozoic is continued up to the present. It began about 60 million years ago. II. Timeline of Cenozoic Era (~66 Ma to 10000 years) The Cenozoic Era is divided into two periods–the Tertiary and the Quaternary. The Tertiary is subdivided into five epochs. The name of each epoch ends with the suffix one (Greek, recent) and refers to the progress of life. , search for petroleum, of which more than 50 per cent of the world production comes from the Tertiary rocks. 1 PANGAEA, THE SUPER-CONTINENT The Earth is a dynamic or constantly changing planet.
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.