麦秸还田对水稻生长的影响

EFFECT OF RETURNING OF WHEAT STALK TO FIELD ON GROWTH OF RICE

麦秸还田对稻谷成苗和稻苗分蘖有一定的影响 ,还田量越大 ,成苗率越低。麦秸还田对水稻产量的影响主要原因是分蘖成穗数少。麦秸还田的稻苗植株干重和N、P、K含量高于不还田 ,这就表明 ,麦秸适量还田或通过干湿交替 ,使群体变化不受影响 ,则可提高水稻产量。水稻拔节前测定的数据表明 ,土壤还原性物质的含量较高 ,Eh的变化范围在 - 94mV～ 54mV 。

The returning of wheat stalk to rice field has a certain effect on establishment and tillering of rice seedlings;the greater the amount of returned wheat stalk,the lower the rate of established seedlings.The main cause of the affection of field returned wheat stalk on rice yield consists in low rate of ear bearing tillers.The dry weight as well as N,P,K contents of rice seedlings and plants in rice field with returned wheat stalk are higher than those in CK rice field (without returned wheat stalk).This indicates that returning wheat stalk to rice field at an appropriate amount or using alternate irrigating and draining system may avoid affecting evolution of rice population and so increase rice yield.According to the data measured before rice jointing,the content of reducing matters in soil is rather high,the soil Eh value varies between -94mV and -54mV,so the soil is in a rather strong reducing state.