Vol. 11, Issue 12 (2022)

Author(s):
Bharti Parmar, Ekta Joshi, RH Wanjari, Muneshwar Singh and Pragya Kurmi

Abstract:
The field experiment was conducted during Kharif season of 2018-19 to evaluate the effect of different doses of potassium (K) on performance of rice crop. The experiment was laid out in Randomized Block Design (RBD) comprised of 4 doses of K viz., K0 (0 kg K ha^-1) (control), K40 (40 kg K ha^-1), K80 (80 kg K ha^-1), KFP (10 kg K ha^-1) with 3 replication under ongoing Long-Term Fertilizer Experiments (AICRP-LTFE) project at ICAR-Indian Institute of Soil Science, Bhopal (M.P.). The soil of the experimental site was Vertisols with the pH of 7.4 and EC 2.3 dS m^-1 and organic carbon 0.77%. The data on nutrient content, uptake and economics of rice crop indicated significant influence of different doses of K treatments on crop viz., N (358.1 kg ha^-1), P (40.2 kg ha^-1), K (441.5 kg ha^-1) in soil. N (1.33 kg ha^-1), P (0.19 kg ha^-1), K (0.40 kg ha^-1) in grain and N (0.35 kg ha^-1), P (0.060 kg ha^-1), K (2.27 kg ha^-1) in stover with higher level of K dose (80 kg ha-1), similarly the maximum uptake by grain, stover and total uptake by rice was recorded with 80 kg ha-1 of K application and was statistically at par with the application of K @ 40 kg ha^-1. Maximum grain yield (5495 kg ha^-1) and stover yield (6223 kg ha^-1) of rice attain with application of K @ 80 kg ha^-1 and which was at par with 40 kg ha-1 K application. Therefore, the better growth and highest grain yield and stover yield of rice with application of K @ 80 kg ha^-1 had fetched significant gross returns, net returns and B: C ratio compared to plot where no K was applied and farmers practice. The investigation proved that higher levels of K @ 80 kg ha^-1 resulted in significant improvement in crop yield and also after reducing K dose from 80 to 40 kg ha^-1 there was no major effect on yield of rice crop.