EFFECT OF N-FERTILIZER AND INOCULATION ON CALCIUM, MAGNESIUM AND CHLORIDE CONCENTRATIONS OFPOT CULTURED MATURE SOYBEAN SEEDS

摘要

A pot culture experiment on soybean cv Wiiliains-82 was conducted in clay loam soil w ith seven different levels (T_1 to T_7) of N fertilizer added @ 0, 23,25, 50, 75,100 and 125 kg ha~(-1) plus a constant dose of P_2O_5 + K_2O fertilizer (a) 60 + 30kg ha~(-1), respectively. A constant dose of FYM was also mixed with soil (1:3). These seven fertilizer treatments were applied to both non-inoculated (non-inoc) and inoculated (inoc) pot cultured soybean crops. Physiologically matured seeds analysed fortheir Ca~(2+) Mg~(2+) and Cl~- concentration, showed that N-fertilizer treatments significantly (P < 0.05) increased the Ca~(2+) and Mg~(2+), but a depressing effect was noted for Cl~- concentration (except T_2 and T_3) as compared with control (T_1). However, within N treatments the Ca~(2+) and Mg~(2+) concentrations were found to be inconsistent Statistically significant concentration of Ca~(2+) and Cl ~-were recorded for T_2 (477.3 and 500.06 mmol kg~(-1) seed), and Mg~(2+) for T_7 (173.8 mmol kg~(-1) seed), respectively. Results further indicated that when averaged across the N levels, inoculation significantly increased the aforementioned nutrients by 5.2, 16.0 and 114.1 mmol kg~(-1) seed: respectively. The simple correlation coefficient (r) revealed that Mg~(2+) concentration showed a significant positive relationship with grain yield (0.426), while Ca~(2+) concentration exhibited significant positive relationship with soluble protein (0.442) and oil contents (0.429) without having any concomitant loss in their grain yield. Therefore, Ca~(2+) and Mg~(2+) concentrations could be used as a suitable selection criterion for predicting the quality and quantity in soybean cv. Williams-82 seeds, respectively.