干旱区灌溉量对长绒棉蕾铃脱落的影响

通过对地面灌溉条件下不同灌溉量和灌水量下长绒棉蕾铃脱落情况的调查,研究了灌溉量、灌水量对长绒棉全生育期、不同生育时期、不同果枝节位蕾铃脱落的影响.结果显示灌溉量过少或过多,棉花蕾铃脱落都较严重,只有灌溉量达到适宜水平,同时能够及时补充水分,蕾铃脱落才相对较低.在南疆阿克苏地区灌溉量6 000～6 200 m3/hm2蕾铃脱落率最小.棉花蕾铃脱落在花铃期比较严重,所以应注意此时棉花对水分和养分的供应.棉花中部脱落比较严重,尤其是第7果节位达到8;～9;以上.

Effect of irrigation quantity in arid region on abscission of cotton buds and bolls of long-fibre cotton

The experiment was conducted to study the effect of irrigation quantity and irrigation water supply on the whole growing period,different growing periods and buds and bolls abscission of different fruit branch holes,based on the investigation of buds and bolls abscission of long-fibre cotton under condition of different irrigation quantity and irrigation water supply.The results indicated that the cotton buds and bolls abscised seriously when irrigation quantity was too less or too more.The cotton buds and bolls abscised relatively less,only when irrigation quantity was in proper level and water was supplied in time.In experimental zone of Aksy area in the south of Xinjiang,When the suitable irrigation quantity was between 6 000-6 200 m~3/hm~2,cotton buds and bolls abscission rate reached the least level.In normal conditions,the abscission rate of cotton buds and bolls was serious,at that time great attention should be paged to supplying cotton with water and nutrition.