当前随着复种指数的提高,大部分农村复种指数已达200％左右。改春播为夏播,改单种为套种,搞一年多熟制等,如此连作赶茬,土壤肥力日渐低下。如果对土壤有机质再不作相应补充,单一的靠化肥是很难持续增产。对此,笔者作了大量调查,广大农村靠种植绿肥和秸秆还田是很难办到的。因此,必须广辟肥源。下面就将其措施介绍给读者,供生 At present, with the improvement of the multiple cropping index, most of the rural multiple cropping indices have reached about 200%. Change the spring sowing for the summer broadcast, change a single kind of intercropping, engaged in more than a year cooked, so even continuous cropping, soil fertility is getting lower. If the soil organic matter is not to be supplemented accordingly, a single fertilizers is difficult to continue to increase production. In this regard, I made a lot of investigation, the vast rural areas by planting green manure and straw is difficult to do. Therefore, we must broaden sources of fertilizer. The following measures will be introduced to the reader for the students