绿肥根茬培肥增产效应的研究

在草甸白浆土上对草木樨、秣食豆、黑麦草根茬的培肥增产效应进行了5年的试验研究。结果表明,强大的绿肥根系,能够改善土壤理化性质,提高后作物产量。以5年粮豆总产量计,粮草轮作的产量较之粮豆轮作的产量相等或略低;但在粮草轮作中,绿肥地多收鲜草(饲料)1350～1500公斤/亩;总效益高于粮豆轮作。把绿肥全部翻压作肥料同只用绿肥根茬还田的对比中,后者的效益大于前者。

THE EFFECT OF GREEN MANURE AND ROOT STUBBLE ON CULTIVATING FERTILITY AND INCREASING YIELD

On the planosol of meadows,a five-year test and study was taken on the effect of yield increase of root stubble of Sweet clover,grain and soybean,rye and grass upon cultivating fertility.The test result showed that developmental root system could improve the physical and chemical nature of soil,increase yield of latter-crop.By grass yield of grain and soybean,yield of grain-grass rotation is equal to or less than yield of grain-soybean rotation.But in grain-grass rotation, the field of green manuring has grown grass(forrage) to 1350-1500 kg/mu,it gross economic benefit is higher than that of grain-soybean rotation. In the economic benefit of contrasting all green manure used as fertilizer with the returning only root stubble of green nature to field, the latter is larger than the former.