A field experiment was conducted to understand the mechanism underlying the reduction in potato yield under continuous cropping. The results showed that the activity of root system, root active absorption area, and total root absorption area were reduced as the continuous cropping year inc reased. Compared with rotation cropping, the activity of root system under continuous cropping for 3, 4, and 5 years decreased by 53.71%, 66.84%, and 66.69%, r...

In arid areas of middle Ningxia, two years of field experiments were conducted to elucidate effect of timing, pattern, and film color of plastic mulching on soil moisture, potato yield, and water use efficiency. The results showed that compared with the bare land cultivation, mulching can improve the soil moisture. For early spring double ridges mulching, the water content of 0～100 cm soil were 18.10% and 19.73% for white film and black film, res...