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以杂交稻天优998为材料,设置稻草覆盖还田和无稻草还田两种处理和4种氮肥处理,并进行了连续2年的田间试验。稻草覆盖还田可以显著提高晚稻产量,4个施氮处理表现一致。在产量构成因素中,有效穗数对产量的贡献最大。稻草覆盖还田促进水稻分蘖,最高茎蘖数和分蘖成穗率协同提高,最终使有效穗数显著增加。
The hybrid rice Tianyou 998 was used as material to set up straw-covered and non-straw-returning treatments and 4 kinds of nitrogenous fertilizer treatments. Field experiments were conducted for 2 consecutive years. Rice straw returning to the field can significantly increase the yield of late rice, and the four nitrogen treatments are consistent. Among the factors that make up the yield, the effective spikes contributed most to the yield. Returning rice straw to paddy field promoted the tillering of rice, synergistic increase of tiller number and tillering rate, and finally increased the effective spike number significantly.