田间涝渍对棉花产量的影响分析

根据棉田小区涝渍动态观测资料,计算了农田涝渍程度,分析了涝渍作用特点和涝渍作用强度对棉花产量的影响。分析表明,仅受渍的情况下,当受渍程度(SEW30)达到126 cm.d时会造成棉花明显减产(15%左右),当SEW30达到455 cm.d时可致棉花减产过半;针对涝渍相随发生情形,当涝渍综合作用强度(SFEW)达到70 cm.d时就会对棉花产量有明显影响(减产10%以上),SFEW100 cm.d左右时棉花减产20%以上,SFEW253 cm.d时致棉花减产近半。

Influence of Waterlogging on Cotton Output in Cropland

Based upon observed data of waterlogging occurred in cotton field,waterlogged degree of farmland was computed,influences of waterlogged feature and waterlogged degree on cotton output were analyzed.Analysis showed that: in case of subsurface waterlogging occurred only,the reduction of cotton output is evident(15% around) because of waterlogging as degree of subsurface waterlogging(SEW30) is 126 cm·d,the loss of cotton output is more than half of the total as SEW30 is up to 455 cm·d;for concomitance of surface waterlogging and subsurface waterlogging in a field,waterlogging results in an obvious impact on cotton when integrated degree of waterlogging(SFEW)is up to 70 cm·d,it causes reduction of output more than 10%,and more than 20% reduction of output as SFEW is about 100 cm·d,almost half of the output as SFEW is 253 cm·d.