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秸秆覆盖能有效地集节天然降水、抑制蒸发 ,改善土壤物理性状 ,实现农业高产稳产。据在辽西低山丘陵半干旱区 5°～ 8°农坡地上进行的试验 ,玉米秸覆盖 90 0 0kg/hm2 ,土壤容重比对照下降 2 0 6%,最大毛管持水量增加 3 3 9%。坡地玉米最佳的玉米秸覆盖量为 15 0 0 0kg/hm2 、小麦秸覆盖量为 75 0 0kg/hm2 。在小麦秸最佳覆盖量条件下 ,玉米产量提高 2 9 4 5 %。秸秆覆盖量过大 ,不利于作物生长 ,产量易受到影响。
Straw cover can effectively set the section of natural precipitation, inhibit evaporation, improve soil physical properties, to achieve high and stable agricultural output. According to the experiment carried out on the agricultural landslope of 5 ° ~8 ° in the semiarid area of western Liaoning hilly region, the corn straw covered 90 0 kg / hm2, the soil bulk density decreased by 20.6% and the maximum capillary water holding capacity increased by 339%. The optimum amount of corn stalks covered by slope corn was 15 0 0 kg / hm2 and that of wheat straw covered 75 0 0 kg / hm2. At the optimum coverage of wheat straw, maize yields increased by 295.5%. Straw cover is too large, is not conducive to crop growth, yield is easily affected.