摘要
１９９１～１９９５年在人工控制水分的条件下，研究不同生育阶段土壤水分对棉花蕾铃脱落与纤维品质的影响。研究发现，土壤水分不足或过大，均易造成蕾铃脱落增加和品质下降。有利于增蕾保铃和提高纤维品质的土壤湿度，约相当于田间持水量的５５％～７５％。不同生育阶段的棉花蕾铃脱落率和对水分的敏感系数不同。蕾铃脱落对水分的敏感系数以开花盛期－吐絮期最大，蕾期相对较小。脱落率以开花盛期－吐絮期最大，开花－开花盛期次之，吐絮期居第三位，现蕾－开花期最小。这些阶段有利于增蕾保铃的土壤湿度分别为６０％、６６％、６４％和６３％。有利于增加纤维长度、改善纤维细度和增加纤维强度的土壤相对湿度为６５％～７５％。
he effects of soil moisture on abscission of squares and bolls in different stages and on fibre quality of cotton were studied in 1991~1995 under the conditions of water control. It was found that deficient or excessive soil moisture led to increase in abscission of squares and bolls and decrease in fiber quality. The soil moisture favorable to increasing squares and bolls and improving fibre qualities was 60~70 percent of field capacity. The abscission rate and its sensitivity to soil moisture are different at different stages. The sensitivity of abscission to soil moisture was more noticeable in fullflowering to beginning of bollopening stage than in other stages, especially in squaring stage. The maximum abscission rate was in the fullflowering to beginning of bollopening stage, then in the flowering to fullflowering stage, the third was in squaring to flowering and the minimum was in bollopening stage. The soil moisture favorable to increasing squares and bolls in these stages was 54, 68, 64 and 63 percent of field capacity respectively. The favorable soil moisture to increasing fibre length, improving fibre fineness and increasing fibre intensity was 65 to 75 percent of field capacity.
出处
《中国农业气象》
CSCD
1998年第3期8-13,共6页
Chinese Journal of Agrometeorology
关键词
土壤水分
棉花
蕾铃脱落
纤维品质
Soil moisture
Abscission rate of squares and bolls
Fibre quality
Cotton
