Journal
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volume 40, Issue 11-12, Pages 1803-1821Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00103620902896704
Keywords
Oryza sativa L; potassium influx rate; potassium-use efficiency; rice hybrids; root and shoot biomass
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Funding
- Ministry of Science and Technology, People's Republic of China [9600202012]
- China National Rice Research Institute, Hangzhou, China
- Hunan Academy of Agricultural Sciences, Changsha, China
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China imports most of its potassium (K) requirements for crop production. The objective of this study was to evaluate indica rice hybrids for K-use efficiency. Twenty-eight indica rice hybrids were evaluated in nutrient solution. The K influx rate was greatest in genotype Weiyou 64 (684.9nmol K(+) plant(-1) h(-1)) and least in genotype Xie A/909 (457.2nmol K(+) plant(-1) h(-1)). The K-use efficiency was greatest in genotype ShanA/909 [81.8mg dry matter (DM) produced per mg K taken up] and least in genotype Shanyou 64 (55.9mgmg-1). The maximum biomass was produced by genotype Shan A/4663-5 (100.8mg DM per plant), and the least biomass was produced by genotype Xie A/4663-4 (59.1 mg DM per plant). These results suggest that K shortage for rice production can be alleviated by using K-efficient rice genotypes.
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