【摘要】 <正> 在灌溉和非灌溉农业中,作物的生长与土壤水分关系极为密切,研究土壤水分的衰减规律及预报方法对做好蓄水保墒,减少水分的非生产消耗,合理制定灌溉计划,提高农业生产水平具有重要的经济和现实意义。 在我区一年生大田作物,整个耕耙、整地、播种出苗及幼苗生长初期的时段内,土壤表面大部分是裸露的,而且旱象严重。这个时期表层土壤蒸发强烈,土壤干燥层很深,从而在幼苗最为脆弱的阶段影响其生长。为了准确预报在无降雨时段的土壤墒情,做到因时制宜地采取有效的保墒防旱措施,保证更多还原

【Abstract】 Advertisements of farm and forest products, machinery, appliances and instruments for use in water conservancy, soil and water conservation, hydrometry and sediment observation, animal products,seeds etc, may be put into the journal of "Soil and Water Conservation in China"from now. The periodical is published regularly at home and abroad,with up-to-the-minute information issued in due time. priority rate is given to ads to be placed in the journal.The editors "Soil and Water Conservatian in China更多还原