近两年,我们对绿肥老区已接种过根瘤菌的土壤,种植绿肥是否还要接种根瘤菌的问题进行了研究.现将结果报道如下:一、苕子根瘤菌连年接种的效果在江苏溧阳县板浆白土上做了连年接种的田间试验.土壤性质、播种量及接种方法同前报.第一年接种后第二年又继续接种,重复4次,接种量每亩1斤菌剂(每克含菌量1亿个细胞),还配合施过磷酸钙20斤作基肥.结果如表1. In the past two years, we have studied the problem of rhizobia inoculated with the old green manure and whether rhizobium should be inoculated with green manure. The results are reported as follows: First, the effect of Rhizobium japonicum inoculation year after year in Liyang County, Jiangsu Mortar white clay to do year after year inoculated field trials. Soil properties, seeding rates and inoculation methods with the previous report. The first year after inoculation and continue inoculation, repeat 4 times, the inoculation amount of 1 kg per acre agent (per Grams of bacteria containing 100 million cells), but also with the application of 20 kg of calcium phosphate as a base fertilizer results in Table 1.