The Na-K ratio as index of salt stress in rice cultures [India]
1986
Roman, S. | Desai, N.D. | Solanki, J.B. (Gujarat Agriculture Univ., Navsari District (India))
Sixteen rices for salt tolerance in coastal soils in South Gujarat were screened. SLR51214 was the check variety. Twelve entries performed uniformly and at par with SLR51214. Grains were analyzed for nutrient content and Na:K was calculated. K content varied from 0.32 to 0.57. IR2031-729-2 had highest K and lowest Na and yielded highest. Na:K for most varieties was above 2.5. However, IR2031-729-2 had 1.19 and IET7588 had 1.90, indicating a preferential absorption of K over Na. Yield and K content were highly and positively correlated (r=0.96). The relation between yield and Na content was not significant. Na:K, however, was significantly and negatively correlated with yield (r=-0.82)
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