Chemical tests for screening rice genotypes tolerant of Zn deficiency under calcareous fluvents [India]
1986
Singh, B.P. | Singh, B.N. | Sinha, M.K. (Indian Council of Agricultural Research, Bishnupur (India). Agronomy Div.)
In most varieties, visual symptoms of Zn deficiency developed 10-15 days after transplanting. Symptoms appeared first on the 3rd and 4th leaves and gradually extended to lower leaves. Light yellow spots at the base of leaves were early symptoms. They later coalesced to give a rusty brown appearance. Plants were stunted and affected foliage dried. Zn deficiency symptoms varied widely among varieties. Only RAU 4009-3 and RAU 4005-26 were tolerant. Shoot dry matter accumulation was markedly reduced by increasing Zn deficiency. Zn concentration was between 12.8 and 45.0 ppm and was positively and significantly correlated with shoot yield (r = 0.97** ). There was significant negative correlation with P:Zn (-0.95** ) and Fe:Zn (-0.97** ) concentration. Zn concentration was below the critical 19 ppm in highly susceptible varieties. Tolerant var1196ieties had P:Zn 192 and Fe:Zn 7.6. About 97% of the variability (R2 = 0.969** ) in Zn responses was attributed to Zn concentration and P:Zn and Fe:Zn. The contribution of Zn and P:Zn was shown in the multiple regression equation: Y = 4.375 + 0.05** X1 + 0.014 X2 + 6.286 X 10-3** X3 where Y = shoot yield; X1 = Xn content; X2 = Fe:Zn; and X3 = P:Zn (** denotes significance at 1%) Fe:Zn, however, did not contribute significantly to variability in Zn deficiency tolerance. The study showed that Zn concentration and P:Zn could be a reliable tool for screening Zn-efficient varie
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