Changes of Soil Potassium as Affected by Different Rice (Oryza Sativa L.)Genotypes Growth
The differences of uptake and utilization of soil K by two lowland rice genotypes differed in low-K tolerance and were studied by rhizobox cultivation.The results showed that the depletion ratios of all soil K fractions in the rhizosphere of 81,394,a genotype sensitive to low-K stress,were more serious than those of Fujiandao when K was sufficiently supplied.Under low-K stress,the depletion ratio of the available K in the rhizosphere (＜2mm) of Fujiandao was 91.3%,while it was 82.6% in that of 81,394.The depletion ratio of this K fraction in the soil 10mm far from root surface for Fujiandao was still as high as 83.0%,but it decreased to 53% for 81,394.There were no significant differences between the depletion of readily-released K of two genotypes.The average depletion ratio of slowly-released K in the rhizosphere (＜3mm) of Fujiandao was 56.6%,which was significantly higher than that of 8,139,441.7%.More visible desc.ending of soil pH in the rhizosphere of Fujiandao was found compared to that of 81,394,which might be the result of the more proton secretion adapting to low-K stress,and the reason of stronger transformation of slowly-released K into available K for Fujiandao than 81,394.
rice genotype low-K stress slowly-released K
Wang Weimu Chantal Kwizera Liu Hui
Department of Agricultural Engineering,Hohai University,Nanjing,210098,China
国际会议
南京
英文
619-623
2006-08-16（万方平台首次上网日期，不代表论文的发表时间）