Effect of Integrated Plant Nutrition System based Soil Test Crop Response Correlation Studies on the Potassium Fractions of Soil in a Vertisol of Chhattisgarh

Author: Jyoti Bala, L.K. Srivastava, Jagriti Patel, V.N. Mishra, R.K. Banwasi and Gourav Jatav

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Abstract

In an experiment conducted at the Indira Gandhi Krishi Vishwavidyalaya, Raipur (Chhattisgarh) with sweet corn as the main crop, various fractions of potassium in soil were analyzed, and their relationship with each other and with the potassium uptake and yield of sweet corn was studied. The experiment included 72 different treatment combinations as per the procedure for conducting a fertility gradient experiment under soil test crop response correlation approach, with four levels each of nitrogen, phosphorous and potassium fertilizers at varying levels of organic manure (farm yard manure). The results showed the order of dominance of the fractions in soil as: Lattice-K > Non-exchangeable K > Exchangeable K > Water soluble K. Exchangeable and non-exchangeable K showed the highest response due to the varying levels of fertilizer K in soil. It was observed that all the forms of K were positively and significantly correlated with each other, which supports well the dynamic equilibrium of K existing in soil. All the forms were significantly and positively correlated with the green cob yields and K uptake of sweet corn. However, non-exchangeable (r2 value of 0.62) and exchangeable K (r2 value of 0.63) showed highest correlations with the K uptake of sweet corn. This suggests that the non-exchangeable K and exchangeable K can be tested for fertilizer recommendation under soil test crop response correlation studies to determine the inherent supply of potassium by the soil.

Keywords

Exchangeable-K, non-exchangeable-K, lattice-K, soil test crop response correlation approach, farm yard manure

Conclusion

The order of dominance of the fractions of K in soil was: Lattice-K > Non-exchangeable K > Exchangeable K > Water soluble K. High correlation among all the forms of K indicates the existence of dynamic equilibrium in soil. Exchangeable and non-exchangeable K fractions of soil were significantly affected by different levels of soil K as compared to the other fractions. Further, they contributed highest towards the K uptake of sweet corn. This suggests that the requirement of K for sweet corn is not only met through available K, but also through soil reserves K. Therefore, non-exchangeable and exchangeable K can be used for soil test calibration methods to determine the soil inherent K status and thus, for fertilizer recommendations.

References

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How to cite this article

Jyoti Bala, L.K. Srivastava, Jagriti Patel, V.N. Mishra, R.K. Banwasi and Gourav Jatav (2023). Effect of Integrated Plant Nutrition System based Soil Test Crop Response Correlation Studies on the Potassium Fractions of Soil in a Vertisol of Chhattisgarh. Biological Forum – An International Journal, 15(5): 319-325.