棉花生长期较长,干旱是棉花生产中常遇到的灾害。特别是丘陵棉区,地瘦土薄,在无水灌溉的情况下,一般年景也有三分伏旱或秋旱。一般灾年产量损失20—30％,重灾年损失60％左右。皮棉亩产达80—90斤。为了抗御干旱,我县棉区广大群众有盖草防旱抗旱的习惯,全县每年盖草棉地都在一万五、六千亩,取得抗旱保丰收的效果。棉地盖草后,阻止了地面水分蒸发,增加了上壤含水量。白天阳光不能直射地面,土温比不盖草的低,夜间土表温度不易发散,故比不盖草的稍高,调节了地温。在雨后、灌水后骤晴时,棉地不会产生地裂。同时也抑制了杂草的生长,增加了有机肥料。群 Cotton grows longer and drought is a disaster often encountered in cotton production. Especially the hilly cotton area, thin to thin soil, in the case of anhydrous irrigation, the general year also has three points drought or autumn drought. General disaster annual output loss of 20-30%, heavy losses of about 60% loss. Lint yield of 80-90 pounds. In order to resist the drought, the vast masses of cotton in our county have the habit of fighting drought and drought. The county covers 15,000 and 6,000 mu of grassland each year and has achieved the effect of drought-resistant and good harvest. Covering the grass in the cotton area prevented evaporation of ground water and increased soil moisture content. During the daylight can not direct the ground, soil temperature than the grass is not low, the night surface temperature is not easy to diverge, so slightly higher than the grass, adjust the ground temperature. After the rain, when the water is clear and sunny, the ground will not crack. Also inhibited the growth of weeds, an increase of organic fertilizer. group