By J. F. Parr, B. A. Stewart, S. B. Hornick, R. P. Singh (auth.), R. P. Singh, J. F. Parr, B. A. Stewart (eds.)
From the start of agriculture till approximately 1950, elevated nutrition creation got here virtually completely from increasing the cropland base. on account that 1950, even though, the yield in step with unit of land sector for significant plants has elevated dramatically. a lot of the rise in yields was once as a result of elevated inputs of strength. among 1950 and 1985, the farm tractor fleet quadrupled, international irrigated zone tripled, and use of fertilizer elevated ninefold. among 1950 and 1985, the full power utilized in international agriculture elevated 6. nine occasions. Irrigation performed a very vital position within the swift bring up in nutrients creation among 1950 and 1985. The world's irrigated land in 1950 totaled ninety four million hectares yet elevated to a hundred and forty million through 1960, to 198 million via 1970, and to 271 million hectares in 1985. although, the present expense of growth has slowed to below 1 % in step with 12 months. the realm inhabitants maintains to extend and agricultural creation through the yr 2000 must be 50 to 60% more than in 1980 to satisfy calls for. This persevered call for for foodstuff and fiber, coupled with the pointy decline within the development price of irrigation improvement, signifies that a lot of the extra agricultural creation in years to come needs to come from cultivated land that's not irrigated. Agricultural creation could be accelerated within the arid and semiarid areas simply because those areas make up titanic parts in constructing nations the place populations are speedily rising.
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Extra info for Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability
III. Weed Control ............................................. A. Weed Control with Tillage . . . . . . . . . . . . . . . . B. Weed Control with Herbicides. . . . . . . . . . . . . . . C. Weed Control with Crop Rotations ......................... IV. Water Infiltration, Evaporation, and Conservation ............... A. Infiltration and Runoff . . . . . . . . . . . . . . . . . . B. Evaporation. . . . . . . . . . . . . . . . . . .
These refinements are in the area of improved understanding of the crop-climate interaction, particularly when this information is used to evaluate alternative crop selection or management practices. There are no set guidelines or fully successful studies that allow for a complete analysis of the agroclimatological resources of an area. These studies are beginning to emerge as the ease in data base manipulation becomes more advanced. V. Limitations It is often assumed that the primary limitation to agroclimatological research is data, however, the limit is high-quality data.
O. Drawer 10, Bushland, TX 79012. 1990 by Springer-Verlag New York Inc. w. Unger 28 X. Summary and Conclusions. . . . . . . . . . . . . . . . . . A. Accomplishments ....................................... B. Needs............................................. References .................................................... 59 59 60 61 I. Introduction "Conservation tillage is not a panacea, but it is one of the best ways yet found to meet our national priorities of soil and water conservation" (Meyers, 1983).
Advances in Soil Science: Dryland Agriculture: Strategies for Sustainability by J. F. Parr, B. A. Stewart, S. B. Hornick, R. P. Singh (auth.), R. P. Singh, J. F. Parr, B. A. Stewart (eds.)