关键词: 小麦, 小麦, 灰色关联度, 新品种(系), 综合表现

Abstract: Experiment was carried out to compare effect of different mulch ways on soil character and tobacco leaf quality, the results showed that high C/N ratio straw and plastic film double mulches could harmonize soil temperature at all the stages of growth and development of flue-cured tobacco, decrease daily variations of soil temperature, significantly increase and retain the moisture capacity of soil. Single high C/N ratio straw mulch was similar to straw and plastic film double mulches in soil improvement and tobacco leaf quality. Because single straw mulch decreased soil temperature at the prophase of flue-cured tobacco growth and development, growth speed was relatively slow that resulted in the decrease of yield. However, single plastic film mulch increased tobacco leaf yield, the output was still higher than the single straw mulch and lower than the double mulches. Soil moisture of the 0~20cm arable layer of applying the high C/N straw and plastic film double mulches was respectively higher than no mulch, single straw mulch and plastic film mulch, which increased respectively 16.82%, 6.45%and 5.43%, and which harmonize relatively tobacco leaf chemical compositions. However, the yield and the output of tobacco leaf in the straw and film double mulch were also higher than the single straw mulch and the single plastic film mulch.