夏季光热资源较好,有利于植物生长,群众素有播种短期绿肥的习惯。为了进一步发展和提高这一工作,我们在岐山县马江公社进行了黑豆、绿豆等绿肥的夏播试验。该社地处关中西部原区,据1975年普查,土壤有效氮极缺面积占56.3％,较缺面积占35.2％,缺氮面积91.5％。80％的土壤有机质含量在1.2％以下,40％以上的土壤含量不足1％。肥力很低,急需培肥,发展短期绿肥有广阔的前途。全社1977年夏播绿肥3307亩,1978年达4200亩,实现了夏休闲地一片绿,保证了农业全面稳定增产。一、生长情况夏季短期豆科绿肥一般6月下旬播种,最迟不晚于7月上旬,生长期50—60天。翻压前,我们对其生长发育状况进行了调查。方法 Summer light and heat resources are good, is conducive to plant growth, the masses known as sowing short-term green manure habits. In order to further develop and enhance this work, we conducted a summer sowing test of green manure such as black bean and mung bean in Mjiang commune, Qishan County. According to the 1975 census, the area of ​​available nitrogen is 56.3% of the total available area, 35.2% of the area is short and 91.5% of the area of ​​nitrogen deficiency. 80% of the soil organic matter content below 1.2%, 40% above the soil content of less than 1%. Fertility is very low, urgent need to cultivate fertilizer, the development of short-term green manure has a bright future. The whole community in the summer of 1977 sowing 3307 acres of green manure, up to 4200 acres in 1978, summer to achieve a piece of green, to ensure a comprehensive and steady agricultural production. First, the growth of summer short-term leguminous manure generally sown in late June, the latest no later than early July, growing 50-60 days. Before turning over, we investigated its growth and development. method