Vol. 12, Special Issue 11 (2023)

Author(s):
Puspanjli Shukla, Priyanka Jadon, Sonali Kamle, Rinku Kamle and Yashwant Gehlot

Abstract:
The potassium fixation and release was studied under nine long term fertilizer treatments viz.,T₁- unfertilized control, T₂- 20 kg N + 13 kg P ha^-1, T₃- 30 kg N + 20 kg P ha^-1, T₄- 40 kg N + 26 kg P ha^-1, T₅- 60 kg N + 35 kg P ha^-1, T₆- 6 t ha^-1 FYM + 20 kg N + 13 kg P, T₇- 5 t ha^-1 crop residues + 20 kg N + 13 kg P, T₈- 6 t ha^-1 FYM and T₉- 5 t ha^-1 crop residues (CR). The K fixing capacity of soil was determined by conducting an incubation study with additions of various concentrations of K (0, 50, 100, 150, 200, 300 and 400 ppm) to soil. The incubations were carried out for different period of intervals viz. 1, 2, 4, 7, 14 and 30 days and the K was extracted and fixed K was determined. Similarly, the K releasing pattern of soil was evaluated by successive extraction with 0.01 N HCl. The results of present study revealed that the percentage K fixed showed decreasing trend with the increment in added K irrespective of the treatment. Further, the K release showed decreasing trend with increasing number of extractions and all the treatments continued to release K up to 13th extraction. Among the different treatments studied the treatments involving the application of FYM either alone or in combination with chemical fertilizers (T₆ and T₈) showed superior performance with respect to K fixation and release as compared to the other treatments.