紫云英是我县最主要的冬季绿肥。为了增加绿肥产量,一年来我们多点试验了苗圃法繁殖紫云英根瘤菌。证明苗圃法增产绿肥效果稳定,增产29.5％(见表1.2,图1),土法上马,成本低,菌体新鲜,活性较强,队队可搞。一苗圃的准备及播种在紫云英大面积播种前40—50天,即8月中下旬播种。苗圃的净面积约需大田播种紫云英面积的千分之一。选用土质疏松,排灌方便的旱地或桑地,先进行整地灭草,施基肥(最好多施些稻壳灰或草木灰),如果地力太差,可加施底肥。每分苗圃地再施过磷酸钙5—10斤(碾碎过筛)。要特别注意把肥料与2—3寸土层的土壤掺匀。然后做成宽4—5尺的畦,畦沟开深 Aspen is the most important winter green manure in our county. In order to increase the production of green manure, we have tested the nursery method for breeding Rhizobia species for many years in the past year. Prove nursery method of green manure production and stability, yield 29.5% (see Table 1.2, Figure 1), indigenous launched, low cost, fresh cell, strong activity, the team can engage in. The preparation and sowing of a nursery is sown 40 to 50 days before sowing the large area of ​​the vermilion, that is, sowing in late August. The net area of ​​the nursery sowed about one-thousandth of the area of ​​the sowing of the vermilion field. Use loose soil, irrigation and drainage to facilitate the dry land or mulberry, the first field weeding, base fertilizer (best to apply some rice hull ash or ash), if the poor soil, add base fertilizer. Every minute nursery and then applied calcium phosphate 5-10 kg (crushed sieved). Pay special attention to fertilize the soil with 2-3 inches of soil. Then make a width of 4-5 feet 畦, 畦 ditch deep