混合固氮菌剂-水稻联合体系的固氮特性  

CHARACTERISTICS OF NITROGEN FIXATION OF MIXED DIAZOTROPHS ASSOCIATED WITH RICE PLANT

作　　者：林凡[1] 王正芳[1] 王耀东[2] 宋未[2] 

机构地区：[1]江苏省农业科学院原子能农业利用研究所 [2]中国农业科学院原子能农业利用研究所

出　　处：《核农学报》1997年第3期179-183,共5页Journal of Nuclear Agricultural Sciences

摘　　要：应用１５Ｎ示踪技术研究了南京土壤条件下混合固氮菌剂水稻联合体系的固氮特性。结果表明，紫香糯稻接种混合菌剂后，稻株利用的固氮量为１０３ｋｇ／６６６．７ｍ２，固氮率６．７％；拔节期—齐穗期是固氮高峰期，日平均固氮量达２４３１ｍｇ／ｍ２·ｄ，这阶段固氮量占整个生育期固氮量的４０９％；拔节期—成熟期的固氮量占整个生育期固氮量的７０％以上；节肥能力为每６６６７ｍ２１３．３ｋｇ硫铵；稻谷产量增加４１４％。Characteristics of N 2 fixation of diazotrophs associated with rice plant in paddy soils in Nanjing was studied by 15 N tracing technique. The results showed that amount of N fixed by rice plant was 1.03kg/666.7m 2 and the rate of fixed N was 6.7%. The maximum N fixed was occured during jointing—complete heading stage. The daily average amount of N fixed reached to 24.31mg/miniplot·day. The fixed N of jointing—complete heading stage was 40.9% of that whole rice growth stage. The amount of fixed N during jointing—maturing stage was over 70% of whole rice growth stage. The economic benefits for fertilizer saving was 13.3kg/666.7m 2 of ammounium sulphate. The yield of rice grain was increased by 4.14% after inoculation with the mixed diazotrophs. \ \

关 键 词：固氮 固氮菌 水稻 

分 类 号：S511.01[农业科学—作物学]