Summary
Out of various soil and plant test methods tested for predicting response of rice to K application in soils of a rice growing valley region the Hanway and Heidal extractant neutralN NH4 OAc turned out to be the best. The critical limit of extractable K was 160 ppm by the Hanway and Heidal extractant, and by the Bray's reagent 175 ppm. Critical K level in the rice plant is 0.4%. Correlations between the extractable K and K uptake were highly positive for various extractants: Hanway and Heidal, Morgan, Hunter and Pratt No. 2, Blanchet and Perigand and MacLean. Although majority of the soils of the region was Inceptisols followed by Alfisols and Vertisols, all soil types had a similar available nutrient status and a similar pattern in relative grain yields. K response was noticeable in Alfisols with respect to grain and straw yields. The grain P concentration in Vertisols, and straw K in Alfisols indicated the contribution of K towards the productivity of two soil groups.
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Bansal, K.N., Bhadoria, U.P.S. & Dube, J.N. Effect of applied potassium on nutrient contents of rice grown in three soils. Plant Soil 84, 275–278 (1985). https://doi.org/10.1007/BF02143190
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DOI: https://doi.org/10.1007/BF02143190