不同冬小麦品种对秸秆覆盖响应的差异

对6个冬小麦品种的秸秆覆盖试验结果表明,秸秆覆盖处理节水效应明显,但不同品种对秸秆覆盖的响应存在一定差异。在华北平原秸秆覆盖农田小气候条件下,8901和6365对春季低温效应不敏感。在节水的同时,可以增产,提高水分利用效率。水分利用效率高的品种总干物质累积以及干物质向穗、茎、叶的运转,与3种处理下品种产量水平水分利用效率的综合评价位次一致,即产量水平水分利用效率高的品种的总干物质累积,以及干物质在穗、茎、叶的累积在不覆盖充分灌溉处理、覆盖充分灌溉处理、和不覆盖亏缺灌溉处理情况下都较高,黄叶干物质累积规律与之相反。

Response of different varieties of winter wheat to straw mulching

The experiments during 2002-2003 indicated that the yields of 6 varieties of winter wheat responded differently to straw mulching due to the discrepancies of their physiological and ecological traits, and the straw mulching treatments showed an obvious water-saving effect. The varieties 8901 and 6365 were not sensitive to low temperature of straw mulching in spring, and their yield and WUE were increased under straw mulching. It was the accumulation effects of yield components that led to the difference of the yield. The integrated order of WUE of the 6 varieties, under mulch and full irrigation, nonmulch and full irrigation, and non-mulch and deficit irrigation, showed the same law as the total dry matter accumulation and its distribution to spike, stem and leaves, but the contrary law to its distribution to yellow leaves.