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建平县小塘公社黑山嘴大队小北沟生产队有4300亩土地,分布在13个山头和5条大沟里。每年种地1700亩,一般年景打7、8万斤粮食,人缺口粮,畜缺饲料。1958年开始植树造林,现有林地1580亩,复被率达到37%;1965年开始大种牧草绿肥,现在每年保持1000亩左右。植树种草,改善了农业生态环境,基本上控制了水土流失,提高了地力,1979年粮食总产达到30万斤。60%的绿肥茎叶用于养猪、羊、兔和大牲畜,促进了畜牧业发展。全队190口人、养猪200口,240只羊和51头大牲畜。分析小北沟生产队农田生态系统的氮素循环证明:该队能够摆脱贫困落后而貌,实现粮
Xiaoping Village, Xiaopingtang Brigade, Xiaopingtang Brigade, Xiaopingtang Commune, Jianping County There are 4,300 mu of land in Xiaobeigou Production Team, distributed in 13 hills and 5 ditches. 1700 acres of land every year, the general annual playing 7,800 kg of grain, people gap grain, livestock shortage of feed. In 1958, afforestation began. The existing 1580 mu of woodland was rehabilitated at a rate of 37%. Large-scale grass green manure was started in 1965 and is now maintaining at about 1,000 mu per year. Planting trees and grasses improved the agricultural ecological environment, basically controlled the soil and water loss and improved the soil fertility. In 1979, the total grain output reached 300,000 kg. 60% of green manure stems and leaves for pigs, sheep, rabbits and livestock, promoted the development of animal husbandry. The team of 190 people, 200 pigs, 240 sheep and 51 large livestock. Analysis of Nitrogen Cycle in Farmland Ecosystem in Xiaobeigou Production Team Proves that the team can get rid of poverty and backwardness and achieve food