我省是古老的农业区,广大农民在早作农业生产实践中,总结出许多用地养地的经验。这些经验既各有特点,又都有不足。如增施有机肥料养地,要受肥源限制,不能如愿施足;苜麦轮作效果好,可惜周期过长,影响当年粮食总产;豆麦轮作虽然稳产,但 My province is an ancient agricultural area, the vast number of peasants in the early practice of agricultural production, summed up many of the experience of land-use. Both of these experiences have their own characteristics and they all have their own deficiencies. Such as increasing organic fertilizer to raise land, to be subject to fertilizer constraints, can not do so; full effect of alfalfa rotation, but the cycle is too long, affecting the total grain output;