Nitrogen Nutrition In The Intercropping System Of Peanut With Rice Cultivated In Aerobic Soil

Rice plants could be cultivated in aerobic soil and reach yields of 7500-8500 kg ha'1, similar to those of rice cultivated in waterlogged soil. The successful practice of rice cultivation in aerobic condition could saves substantive irrigating water and also makes it possible to intercrop rice with legumes. Peanut is often used as a component crop in intercropping systems, and rice crops consume almost 30% of the chemical nitrogen fertilizers in China. Therefore, a new intercropping system of peanut with rice is of great significance in development of sustainable agriculture in China.The novel cultivation of paddy rice variety in aerobic soil reveals a great potential not only for water-saving agriculture but also for the rice intercropping with legumes, both of which are closely related to sustainable development of agriculture. In this study, root partition experiments were carried out to investigate yield advantages in intercropping system of peanut with rice crop cultivated in aerobic soil and the effects of intercropping system on soil N fertility and interspecific competition on root distribution were also studied in field condition. Sand sulture and solution culture experiments were then done to examine the excretion of nitrogenous compounds by the root of peanut intercropped with rice at different growth stages such as seedling, flowering and pod-filling stage of peanut crop, and a field experiment was conducted to investigated the interaction between rice and peanut in mixed cropping and peanut crop was inoculated with rihzobium. The main results were as follows:1. Using root partition technique to investigate the biomass and yield advantage in rice and peanut intercropping system. The results showed that 1) yield advantage and nitrogen...