Assessing Silicon Availability in Soils of Rice-Growing Lowlands and Neighboring Uplands in Benin and Nigeria  

作　　者：S. S. ABE Y. YAMASAKI T. WAKATSUKI 

机构地区：[1]Africa Rice Center, 01 BP2031, Cotonou, Benin [2]Faculty of Agriculture, Kinki University, Nara 631-8505, Japan [3]Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan

出　　处：《Rice science》2016年第4期196-202,共7页水稻科学（英文版）

基　　金：financial support by the Japan Society for the Promotion of Science (Grant No. 19002001);the Ministry of Agriculture, Forestry and Fisheries and the Ministry of Foreign Affairs, Japan

摘　　要：Silicon(Si) is known as a beneficial nutrient in the cultivation of rice, playing a key role in photosynthesis enhancement, lodging resistance and tolerance to various environmental stress. The present study aimed to examine available Si content in both lowland soils(n = 29) and neighboring upland soils(n = 21) collected from Benin and Nigeria and to evaluate the validity of the assessment results through a pot experiment. Our results revealed that the acetate-buffer method predicted Si concentration in rice straw at the harvest stage(R^2 = 0.68, P < 0.01) better than the anaerobic-incubation method(R2 = 0.31, P > 0.05), and 76% of the uplands and 38% of the lowlands were deficient(< 50 mg/kg) in acetate-buffer soluble Si. These findings suggest that the Si-deficiency soils prevail across the study area, making rice plants starved for Si and prone to environmental stress.Silicon(Si) is known as a beneficial nutrient in the cultivation of rice, playing a key role in photosynthesis enhancement, lodging resistance and tolerance to various environmental stress. The present study aimed to examine available Si content in both lowland soils(n = 29) and neighboring upland soils(n = 21) collected from Benin and Nigeria and to evaluate the validity of the assessment results through a pot experiment. Our results revealed that the acetate-buffer method predicted Si concentration in rice straw at the harvest stage(R^2 = 0.68, P < 0.01) better than the anaerobic-incubation method(R2 = 0.31, P > 0.05), and 76% of the uplands and 38% of the lowlands were deficient(< 50 mg/kg) in acetate-buffer soluble Si. These findings suggest that the Si-deficiency soils prevail across the study area, making rice plants starved for Si and prone to environmental stress.

关 键 词：Oryza sativa silicon UPLAND FIELD LOWLAND FIELD 

分 类 号：S511[农业科学—作物学]