Effects of soil permeability on root growth and nitrogen utilization in rice

The effects of soil permeability (0mm/d,10mm/d,20mm/d and 40mm/d) on root growth and nitrogen utilization in rice(IIYOU7954) was studied under pot experiment conditions. Results show the existence of a form of correlation in soil permeability and rice root growth. Appropriate soil water leakage can promote root growth and improve nitrogen utilization. At a permeability of 10mm/d, deep-root to total root number ratio is higher than the control at early growth stage, while white-root to total root number ratio is higher at flowering stage. Nitrogen recovery rate can attain 77.05%，outweighing that of the control. Grain yield is improved when rice is planted in soils with a leakage volume of 10mm/d. Grain yield, root growth and plant growth decrease if soil permeability exceeds 20mm/d. Appropriate volume of soil leakage improves the 1000-grain weight. However, the reverse effect is observed when soil permeability surpasses 20mm/d.