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PLOW LESS, GROW MOREScientists associated with Washington, D.C.-based Future Harvest have announced that a major agricultur al transformation is spreading across Asian breadbasket regions that could lead to higher-producing, ecologically friendlier, and more efficient agricul ture for farmers in the area. "Low-till" farming, which eliminates repeated plowing of fields, is increasing har vests, reducing water use by as much as 50 percent, and requiring less fuel for running tractors, according to researchers with the project. Because there are one-half to two-thirds fewer weeds, herbicide use is also reduced. Farmers in Bangladesh, India, Nepal, and Pakistan are practicing low-till agriculture in such numbers that scien tists say the impact in the region could be as great as that of the Green Revo lution of the 1970s. The success of the approach comes at an opportune time as water scarcity in Asia threat ens the region rice and wheat yields. The transformation is largely the result of pioneering agricul tural research begun in the region by the International Maize and Wheat Improvement Center (C3MMYT), based in Mexico. Low-till practices are currently being used in Asia to sow wheat after a rice harvest. Previously, farmers had to make as many as 6 to 12 tractor passes across a field to break up the muddy soil enough to plant wheat after rice. "Plowing significantly delays planting of wheat," says Peter Hobbs, a natural resource agronomist with CIMMYT and one of the lead scientists with these efforts in the region. "As a result, the crop often does not mature before the onset of the hot, dry season before the monsoon. The dry heat shrivels the grain and reduces harvests and incomes. " In addition, plowing exposes the soil to air, which oxidizes the soil and roots. Over time, nutrients and moisture in the soil are depleted, increasing the need for water through irrigation. Low-till agriculture, howev er, leaves much or all of the soil surface and existing ground cover undisturbed during the planting process. In one pass across a field, a "planter" or "seed drill" places seeds and fertilizer into the soil through the rice straw left standing from the previous harvest Because the leftover straw remains anchored into the soil, those roots provide channels for wheat roots to grow, a habitat for beneficial insects to prey on invasive insects, and, as it decomposes, a natural fertilizer of organic matter for the wheat crop The low till technology is designed to be accessible to farmers who may have no equipment, little cash, and often very little land "Low-till practices have caught on like wild fire among farmers, with the area being planted to low-till agriculture increas ing tenfold per year," says Hobbs.From
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