Rice field ecosystems in northern China Ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems

Abstract

Abstract: The study on the quantities of symbiotic nitrogen fixation of Azolla filiculoides in rice-Azolla combination systems shows that the nitrogen fixation ability of Azolla varied with different periods of growing season. The highest nitrogen fixation rate is occured in early June.Its total quantity of nitrogen fixation is increased with increasing Azolla inoculation rates and rice row distances. Total quantity of nitrogen fixation of Azolla is 107.1 kg·hm^-2 in the system with alternating row rice planting of 50 and 10cm and an Azolla inoculation rate of 1500 kg·hm^-2, and is 36.0 kg·hm^-2 in the system with equal row riceplanting of 30cm and an Azolla inoculation rate of 325 kg·hm^-2.

Key words: Single-cropping rice, Rice field ecosystem, Rice-Azolla combination, wheat, soil porosity, intercropping, walnut tree, agroforestry system, soil bulk density

Su Fengyan, Li Weiguang, Wen Dazhong, Xu Qingde, Lin Jianqun. Rice field ecosystems in northern China Ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems[J]. Chinese Journal of Applied Ecology, 1996, 7(s1): 83-87.

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Rice field ecosystems in northern China Ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems

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