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

作  者:
Susumu S. Abe;Yuka Yamasaki;Toshiyuki Wakatsuk
单  位:
Africa Rice Center, 01 BP2031, Cotonou, Benin; Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japa; Faculty of Agriculture, Kinki University, Nara 631-8505, Japan;Faculty of Agriculture, Kinki University, Nara 631-8505, Japan
关键词:
Oryza sativa L.;silicon;upland field;lowland fiel
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 (R-2 = 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.

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