【摘要】 对稻萍结合系统细绿萍共生固Ｎ量研究表明，萍的固Ｎ力在整个生长季不同时期有所变化．最高固Ｎ率出现在６月初，萍固Ｎ量随其接种量和水稻行距增加而增加．５０～１０ｃｍ宽窄行交替的水稻行距和１５００ｋｇ·ｈｍ－２的萍接种量的稻萍结合系统的总固Ｎ量为１０７．１ｋｇ·ｈｍ－２，而３０ｃｍ等行距的３２５ｋｇ·ｈｍ－２的萍接种量的稻－萍结合系统的总固Ｎ量仅为３６．０ｋｇ·ｈｍ－２更多还原

【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 10 cm 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 30 cm and an Azolla inoculation rate of 325 kg·hm-2.更多还原