Effect of N-fertilizer and inoculation on calcium, magnesium and chloride concentrations of pot cultured mature soybean seeds
2004
Achakzai, A.K.K. (Balochistan Univ., Quetta (Pakistan). Dept. of Botany)
A pot culture experiment on soybean cv. Williams-82 was conducted in clay loam soil with seven different levels (T1 to T7) of N fertilizer added at the rate of 0, 23, 25, 50, 75, 100 and 125 kg ha-1 plus a constant dose of P2O5 + K2O fertilizer at the rate of 60 + 30 kg 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 analyzed for their Ca2+ Mg2+ and Cl- concentration, showed that N-fertilizer treatments significantly (P less than 0.05) increased the Ca2+ and Mg2+, but a depressing effect was noted for Cl- concentration (except T2 and T3) as compared with control (T1). However, within N treatments the Ca2+ and Mg2+ concentrations were found to be inconsistent. Statistically significant concentration of Ca2+ and Cl- were recorded for T2 (477.3 and 500.06 mmol kg-1 seed), and Mg2+ for T7 (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 Mg2+ concentration. showed a significant positive relationship with grain yield (0.426), while Ca2+ 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, Ca2+ and Mg2+ concentrations could be used as a suitable selection criterion for predicting the quality and quantity in soybean cv. Williams-82 seeds, respectively.
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