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Wageningen University (1983)

Analysis and evaluation of tillage on an alfisol ina semi-arid tropical region of India

Klaij, M.C.

Titre : Analysis and evaluation of tillage on an alfisol ina semi-arid tropical region of India

Auteur : Klaij, M.C.

Université de soutenance : Wageningen University and Research center

Grade : Doctoral Thesis 1983

Résumé partiel
Tillage field experiments were conducted on Alfisols in a semi-arid tropical environment in India. The research was conducted within the framework of the Farming Systems Research Program of the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). To put the experiments into perspective, a general review is given in chapter 2 on the environment of the semi-arid tropics, its problems and the research related to agricultural production. Rainfed agriculture has failed to provide a stable and sufficient food supply for the populations of many developing countries. An important reason is the severe physical constraint to agricultural production imposed by the harsh climate. Water is the key factor and though the average total precipitation appears to be sufficient for cropping, its distribution is highly erratic. Much of the rain falls in high intensity storms, resulting in uncontrolled runoff and erosion. Thus a high proportion of the water is lost for crop use. The majority of as much as 500 million people living in the world’s semi-arid tropics, depend on agriculture for income, food and shelter. During the last three decades, populations have doubled in many of the 48 countries which are at least partly located in the semi-arid tropics. Since the indigenous production systems are characterised by stagnant yield levels, hitherto stable forms of agriculture came under immense pressure by the attempt to continue to provide sufficient amounts of food and fiber for the rapidly growing populations. The farmers were compelled increasingly to expand their agricultural activities to more marginal lands. Consequently, the production potential of the resource base is threatened seriously and vast areas already have been damaged permanently further destabilizing agricultural production. To improve a situation of recurrent food shortages, governments tended to concentrate their resources on improving agriculture in water- assured areas. With the advent of high yielding varieties of wheat and rice, this strategy proved succesfull.


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