Effect of Nitrogen Fertilizer on Salinity Tolerance of Mungbean (Vigna radiata L. Wilczek)

概要

論文の詳細を見る
Salinity affects the growth, plant water relations as well as uptake of nutrient elements in mungbean (<I>Vigna radiata</I> L. Wilczek) . This study was initiated to examine whether the application of higher levels of nitrogen (N) would improve the salinity tolerance of this crop. Mungbean plants (var. BARImug 3) were grown in pots, each filled with 12 kg air-dried loamy soil, inside a plastic greenhouse under natural light conditions during the summer of 2001, with three levels of N, equivalent to 13.3 (low), 40 (medium) and 60 (high) kg ha<SUP>-1</SUP> with 0 and 75 mM NaCl. Salinity disturbed the plant water status seriously. Relative water content, xylem exudation rate and leaf water potential decreased by salinity. Application of higher levels of N improved the water status of the plants. Yield and yield components were also adversely affected by salinity, except for the number of seeds per pod. Grain yield and yield components were noticeably improved by the application of high levels of N. The concentrations of N, P, K and Ca markedly decreased by salinity, while that of Na remarkably increased. The concentrations of the nutrients tended to increase, while that of Na to decrease with the application of increased levels of N. It was concluded that the application of higher levels of N improved the water relations and accumulation of nutrient elements as well as yield in mungbean under saline conditions.
日本熱帯農業学会の論文