What is the green manure value of arrow pea?

Arrow pea is a high-quality green manure crop. It can be decomposed after half a month, which can increase the nitrogen in the soil. According to the experiment, the content of available nitrogen in the 0 ~ 20 cm soil layer of fallow land after wheat harvest increased by 66.7% ~ 133.4%, which was 66.7% ~ 249.9% higher than that before multiple cropping. The dry land increased more than the paddy field, and its nitrogen fixation ability was stronger than that of peas. Pea nodules frequently and early. Therefore, the root nodules at seedling stage have certain nitrogen fixation ability, and the nitrogen fixation activity is continuously improved with the acceleration of vegetative growth. The amount of nitrogen fixation in vegetative growth period accounts for more than 95% of the whole growth period. Autumn sowing in the south is in the green period, and spring sowing in the north is the peak of nitrogen activity of rhizobia in the extension period. Now the buds begin to fall; The nodules of most varieties naturally decline after flowering, and the nitrogen fixation activity is very weak. The fertilizer content of broad beans varies with varieties, growth environment and growth stages, especially the nitrogen content varies greatly.

Fertilizer content of different varieties of broad beans (air-dried weight%)

Broad beans consume more phosphorus in the soil during their growth. After mowing, the stubble land is often short of phosphorus, and the green land is also short of nitrogen and phosphorus. Therefore, more phosphate fertilizer should be applied to balance nitrogen and phosphorus and promote crop yield. Sagittarius peas have dense stems and leaves and tangled plants. Cut it off with a disc harrow before rolling, and expose it to the sun for 1 ~ 2 days to make it wilt, reduce its volume and facilitate compaction and burial. In case of drought after rolling, it should be watered and decomposed in time.