<div><br></div><div><section class="_135editor" data-role="paragraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">山东棉区常年“立秋”后即进入旱季，自然降水一般满足不了棉花对水分的需求。此时如果缺水，一方面棉铃发育迟缓，纤维和种子不能正常成熟；另一方面土壤养分也不能发挥作用，缺墒就等于缺肥。棉花生长发育后期，由于营养生长接近停止，最不耐旱，一旦缺水，就会引起早衰，上部幼铃脱落，铃重减轻。后期棉田板结较重，水分不易下渗，常常出现“水过地皮湿”的现象，必须注意浇匀。一般棉田通常在８月下旬干旱时浇一次水即可。但如果秋后持续干旱，９月上旬土壤湿度降到田间最大持水量的５５％～６０％时，也要及时浇水。丰产棉田浇水时间要坚持到９月中下旬。</span></p></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, &quot;Microsoft YaHei&quot;, sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section></div>