覆盖大豆绿肥腐解规律及其对土壤养分的影响

The decomposition rule of covered soybean green manure and its effect on soil nutrient content

田间条件下采用覆盖尼龙袋的方法,研究了大豆绿肥的腐解规律及其对土壤养分的影响。结果表明,覆盖大豆绿肥随时间的延长逐渐腐解,在整个腐解过程中,前4周腐解得较快,以后腐解减慢,并且在种植玉米条件下比不种植玉米条件下腐解得快,但差异不显著。覆盖大豆绿肥经过玉米整个生长季(8周)的腐解,在种植玉米、不种植玉米的条件下的腐解率分别为54.2%和52.4%,其中前4周的腐解量分别占8周总腐解量的79.5%(种植玉米的条件下)和77.1%(不种植玉米的条件下)。覆盖大豆绿肥能明显提高土壤养分含量。

With the nylon bag covered in a corn field, a field experiment was carried out to study the decomposition rule of covered soybean green manure and its effect on soil nutrient content. Results showed that the covered soybean green manure was mineralized gradually with the extension of time. The covered soybean green manure was mineralized more quickly in the first four weeks. After four weeks, the covered soybean green manure was mineralized more slowly; The covered soybean green manure in a corn field was mineralized more quickly than that in a free field. But it was insignificant between them. About 54. 2% of the covered green manure in a corn field and about 52. 4% of the covered green manure in a free field was mineral- ized throughout the growth period of corn （eight weeks）. However, 79.5% of the mineralized green manure in a corn field and 77. 1% of the mineralized green manure in a free field were released in the first four weeks after they were ineorporaed into the soil. Besides, results showed that the covered soybean green manure could increase the soil nutrient content obviously.