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A pot experiment was designed for two consecutive years of (2018 and 2019) to investigate the effect of optimal use of potassium fertilizer by applying at different rates 0, 10, 20, 30, 40, and 50 mg K kg-1 10 kg pot-1 soil. Rice cv. HUR-36 (Malaviya Dhan-36)] crop was transplanted by maintaining four seedlings in each pot and potassium fertilization effect on plant growth and yield attributes of rice was recorded. The experiment was carried out in completely randomized design (CRD) with seven treatments viz., T1: absolute control (0:0:0), T2: 60:30:0 mg kg-1, T3: 60:30:10 mg kg-1, T4: 60:30:20 mg kg-1, T5: 60:30:30 mg kg-1, T6: 60:30:40 mg kg-1 and T6: 60:30:50 mg kg-1 corresponding to 120, 60, 60 (N:P2O5: K2O) kg ha-1. The experiment was conducted in triplicate. The data pertaining to experiment revealed that plant height, effective no. of tillers, chlorophyll content and grain and straw yield were significantly increased as the scheduled rates of potassium fertilizer application increases. In treatment T5 receiving 60:30:30 mg kg-1, potassium was general recommendation but due to intensive cropping of rice, mining of K was noticed. Therefore, increased dose of potassium should be recommended to maintain the replenishment of K in soil system and other side benefit cost ratio should not affect negatively. The treatment received extra doses of T6 to T7 (60:30:50 mg kg-1) showed highest growth in plant and yield of rice but in steady state which is not beneficial economically. Hence, in T7 benefit cost ratio will be poor. In the present experiment, T6 maintains all fulfillment of K whether in plant or soil system.
Zorb C, Senbayram M, Peiter E. Potassium in agriculture-status and perspectives. Journal of Plant Physiology. 2014;171 (9):656–69.
Marschner P. Mineral nutrition of higher plants. 3rd edition. London, UK: Academic Press. 2011;178–89.
Mardanluo S, Souri MK, Ahmadi M. Plant growth and fruit quality of two pepper cultivars under different potassium levels of nutrient solutions. Journal of Plant Nutrition. 2018;41(12):1604–14.
Zivdar S, Arzani K, Souri MK, Moallemi N, Seyyednejad SM. Physiological and biochemicals of olive (Olea europaea L.) cultivars to foliar potassium application. Journal of Agricultural Sciences and Technology. 2016;18:1897–908.
Norozi M, Kaji BV, Karimi R, Sedghi MN. Effects of foliar application of potassium and zinc on pistachio (Pistacia vera L.) fruit yield. International Journal of Horticultural Science and Technology. 2019;6(1):113–23.
Tohidloo G, Souri MK, Eskandarpour S. Growth and fruit biochemical characteristics of three strawberry genotypes under different potassium concentrations of nutrient solution. Open Agriculture. 2018;3(1):356–62.
Gomez KA, Gomez AA. Statistical procedures for agriculture research. Wiley Press, New York; 1984.
Kausar K, Akbar M, Rasul M, Ahmad AN. Physiological response of nitrogen, phosphorus and potassium on growth and yield of wheat. Pakistan Journal of Agricultural Research. 1993;14:126–130.
Bahmariar MA, Ranjbar GA, Ahamafian SH. Effect of N and K application on agronomic characteristics of two Iranian and landrace rice (Oryza sativa L.) cultivars. Pakistan Journal Biological Science. 2007;10(6):880-886.
Devasenamma V, Reddy MR, Rajan MSS. Effect of varying levels of nitrogen on growth and nitrogen uptake of rice hybrids. The Andhra Agricultural Journal. 1999;46:124-125.
Tabar SY. Effect of nitrogen and phosphorus fertilizer on growth and yield rice (Oryza sativa L). International journal of Agronomy and Plant Production. 2012;3(12):579-584.
Krishnappa M, Gowda KN, Shankarnarayan V, Maharudrappa K, Khan MM. Effect of graded levels and split application of potassium on its availability and yield of rice. Journal of Potassium Research. 2006;6(4):156-161.
Bama KS, Selvakumari G. Effect of humic acid and fertilisers on yield and nutrition of rice in Alfisol. Journal of Ecobiology. 2005;17(1):41-47.