Question

semidwarf wheat and rice varieties??

Answer 1

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Semi - dwarf wheat is the dominant variety of wheat grown today, accounting for about 99....later, similar strains for rice and other cereals were developed in Asia...

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Answer 2

 Particular attention is given to the important role played by foreign varieties, especially those generated by international agricultural research centres, in the improvement of wheat and rice in the United States. Neither crop is indigenous to the United States, present varieties have been "immigrants". The genetic source of semi-dwarfism is usually the same for both the US varieties and those in developing nations. The report covers the following: history of production and varietal improvement, development and use of semi-dwarf wheat, development and use of semi-dwarf rice, associated technological factors, changes in yields, evaluation of the economic impact, and institutional linkages. By 1979, 147 semi-dwarf varieties of wheat and 6 of rice had been released. Many of these included varieties developed in the international centres. Semi-dwarf wheat was planted on about 22% of the US wheat area in 1974 and roughly 29% in 1979. Semi-dwarf rice varieties represented about 9% of the US rice area in 1979. The semi-dwarfs have represented an evolutionary rather than revolutionary change. Their use is likely to expand. It is difficult to assess the general economic impact of semi-dwarfs. The cost of production per acre may well increase because of the use of additional fertilizer, but the cost per unit of product should decrease. Because of the tendency for overproduction of both crops and the inelastic demand for each, the benefits may fall much more to consumers than to producers depending on the extent to which the crop is exported. The overall benefits should mean a substantial return to investment in research.<new para>ADDITIONAL ABSTRACT:<new para>The development and use of semidwarf cv. of wheat and rice in the USA are discussed. Semidwarf rice and wheat were sown in 9 and 29% of the potential growing areas resp.