Differential susceptibility of soybean (Glycine Max. L.) cultivars to zinc stress
1986
Gupta, V.K. | Singh, B. (Haryana Agricultural Univ., Hisar (India). Dept. of Soils)
Six soybean (Glycine Max L.) cultivars were evaluated for their differential susceptibility under green house conditions at 0,5 and 10 ppm Zn. Shoot and root yield improved significantly with Zn application. Cultivar Black Tur produced 30% lower dry matter yield than other cultivars, while Monetta produced highest under Zn stress conditions. Black Tur and PK 71-6 were more susceptible as well as responsive to Zn. Zinc fertilization narrowed shoot-root ratio in all the cultivars. The cultivars PK 71-6 and PK 71-21 were less tolerant to excess Zn. Black Tur and Pk 71-6 had lowest Zn content under Zn stress. The Mn content was also influenced due to cultivars. Copper content of Black Tur and Pk 71-6 was higher than other cultivars under Zn-deficiency. Phosphorus content and P/Zn ratio in Black Tur and PK 71-6 was higher than other cultivars. P/Zn ratio in Black Tur and Pk 71-6 was 661 and 799 respectively, under Zn stress. The optimum P/Zn ratio for soybean growth is suggested as 61:138
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