二、高产稳产田应该具有良好的环境条件 1.无跑水、跑肥、跑土的“三跑”现象我省的耕地中有三分之一以上是坡耕地。降雨时,特别是降大雨,雨水来不及渗入土壤,常常有一部分沿地表从坡上向坡下流动,从而把肥沃的表土带走,造成了跑水、跑肥、跑土的“三跑”现象,也就是土壤侵蚀。据测定,我省坡耕地每年一般能流失1厘米表土,以1亩地表土约有8吨重计算。由于都是肥沃表土,相当于每亩地每年流失15斤氮,15斤磷和300斤钾。因此,在坡 Second, high and stable yield field should have a good environmental conditions 1. No running water, run fertilizer, soil running “three run” phenomenon in our province more than a third of the cultivated land is sloping land. When it rains, especially heavy rains, it is too late for the rainwater to seep into the soil and often part of it flows down the slope from the slope to the slope, thus carrying fertile topsoil and causing “three runs” of running water, running fertilizer and running soil , That is, soil erosion. According to the determination of slope farmland in our province can generally lose 1 cm of topsoil each year to 1 mu of surface soil about 8 tons weight calculation. Because they are all over the topsoil, which is equivalent to losing 15 kg of nitrogen, 15 kg of phosphorus and 300 kg of potassium per mu every year. So on the slope