Grain sorghum [Sorghum bicolor Moench] growing with saline water in sandy soil, 2: Effect of various salts on vegetative growth and grain yield
1990
Yamane, M. (Tottori Univ. (Japan). Faculty of Agriculture)
Grain sorghum, Sorghum bicolor (L.) Moench, cv. NK262, was grown on a sand dune field irrigated with salinized waters to clarify the effect of salt composition on vegetative growth and grain yield. Common composition saline water consisted of fresh water salinized with CaCl2, MgCl2, and NaHCO3, in equal proportions, totaling 22.5 me/liter or 45.0 me/liter. Specified composition saline waters consisted of common composition saline water of lower concentration with 6 kinds of salts added. At harvest time electrical conductivity (EC) value and pH value were measured by soil suspension. In the NaHCO3 plot, EC value was low while pH value was particularly high. Regarding salinity injury, all plots were divided into three groups by degree of injury, high, low, and slight. In the highly injured group which comprised the MgCl2 plot and NaHCO3 plot, due to excessive absorption of specified cation, competitive inhibition of absorption of other elements occurred. As a result, vegetative growth and grain yields were severely depressed. In the low injured group which comprised the plots of CaCl2, NaCl, MgSO4, and Na2SO4, specified cation content increased, while competitive inhibition did not occur. In these plots, vegetative growth was moderately depressed, and grain yields were slightly depressed. In the slightly injured group which comprised the plots of common composition of 22.5 me/liter, and 45.0 me/liter, due to excessive Na absorption, the leaf weight was depressed, but vegetative growth and grain yield were the same as that of the fresh water plot
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