为什么在基本相同的生产方式和条件下,不同稻田的产量却有很大的差别呢?有的地方,这种差别每公顷可达十公担。苏联啥萨克共和国水利科学研究院对这个问题进行了研究并得出了这样的看法,在淹没的稻田里,如果水的垂直渗透力减弱了,或者渗透速度低于每昼夜2毫米,那末,那些对水稻生长有害的盐类就不能从土壤中排除出去。由于土壤中缺乏靠水的渗透带进新鲜氧气,水稻就会有被“闷死”的危险。 Why is there a big difference between the yields of different paddy fields under basically the same production methods and conditions? In some places, the difference is up to ten millibars per hectare. The Soviet Union, Gazza Republic, Institute of Hydraulic Research on this issue has been studied and came to the view that in submerged paddy fields, if the vertical infiltration of water weakened, or infiltration rate below 2 mm per day and night, then, Salts that are harmful to the growth of rice can not be excluded from the soil. Due to the lack of infiltration of fresh water by the infiltration of water in the soil, rice is at risk of being “suffocated.”