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Potassium (K) is the third most important major plant nutrient with numerous functions. The availability of K depends on concentration relative to that of Ca2+ and Mg2+ than on the total quantity of K present. The level of extraction of K by different extractants followed the order: boiling HNO3 (1 M) > Non- exchangeable K > Exchangeable K > Water soluble K. The amount of K extracted by different extractants was more in non- calcareous soil followed by calcareous soil. To know the K availability in both the soils, a pot culture experiment was conducted with the two soils (i.e., calcareous and non-calcareous) to know the response of maize to K application. Results showed that a significant higher value of available K in calcareous soil under potassium @ 120 kg K2O ha-1 treatment followed by 80 kg K2O ha-1 in non-calcareous soil irrespective of critical growth stages of hybrid maize. Among the K fractions, water soluble K was the least in magnitude and lattice K was found to be dominant one. Application of 120 kg K2O ha-1 recorded the highest potassium in all the K fractions (water soluble K, exchangeable K and nitric acid soluble K) in all stages of crop growth in calcareous soil whereas in non-calcareous soil 80 kg K2O ha-1 recorded high in all the fractions and the results emphasizing the importance of potassium in soil. Grain and straw yield of hybrid maize were significantly higher under 120 kg K2O ha-1in calcareous soil and 80 kg K2O ha-1 in non- calcareous soil which is well evidenced by a yield increase of 37.7 % over control. A significant and positive correlation was existing between all fractions of potassium viz., HNO3 soluble K, non- exchangeable K, exchangeable K, water soluble K and available K with grain and stover yield in calcareous soil and non- calcareous soil. It was found that calcareous soil showed comparatively better response to the application of potassium especially in water soluble K with an R2 value of 0.917** followed by HNO3 soluble K with a R2 value of 0.895**. Therefore, the present investigation stresses the vital importance of inclusion of higher dose of potassium in calcareous soil for maintaining soil K dynamics and enhancing yield of hybrid maize so as to sustain soil productivity.
Sarkar GK, Debnath A, Chattopadhyay AP, Sanyal SK. Depletion of soil potassium under exhaustive cropping in Inceptisols and Alfisols. Communication on Soil Science and Plant Analysis. 2014;45:61-72.
Mengel K, Kirkby EA. Research on potassium in agriculture: needs and prospects. Kluwer acad. Publishers. Plant and Soil. 2001;335(1-2):155-180.
Chaudhari AV, Mane SS, Chadar BR. Effect of graded levels of potassium on growth, yield and quality of black gram. International Journal of Current Microbiology and Applied Science. 2018;6: 1607-1612.
Lalitha M, Dhakshinamoorthy M. Forms of soil Potassium – A Review. Agri. Reviews. 2014: 35(1):64-68.
Ramamoorthy B, Velayutham M. Nitrogen, phosphorus and potassium in soils: Chemistry, forms and availability. In Soil Fertility – Theory and Practice (J.S. Kanwar, Ed.), Indian Council of Agricultural Research, New Delhi. 1976;156-201.
Sen U, Ghosh AK. Changes in potassium forms, clay and silt mineralogy brought about by intensive cropping. Clay Research. 2011;30:29-41.
Ravichandran M, Srirama Chandra Sekharan MV. Optimizing timing of potassium application in productivity enhancement of crops. Karnataka Journal of Agricultural Science. 2011;24:75-80.
M. C. LEAN, A. E. M. Intracellular potassium in dietary liver necrosis. Nature, London. 1960;185: 936-937.
Hanway JJ, Heidel H. Soil analyses methods as used in Iowa state college soil testing laboratory, Iowa Agriculture. 1952;57:1–31.
Wood LK, De turk EE. The adsorption of potassium in soil in non replaceable form. Soil Science Society and American Proceedings. 1941;5:152-161.
Afroz D, Abedin Mian MJ, Hossain MA, Rashid ES. Effects of split application of potassium on yield and potassium balance for boro rice (BRRI dhan 29). International Journal of Biological Research. 2009;7:73-79.
Rout PP, Chandrasekaran N, Arulmozhiselvan S. Effect of Long Term Fertilization on Soil K dynamics and uptake by Hybrid Maize in an Irrigated Inceptisol under Intensive Cropping. International Journal of Current Microbiology and Applied Science. 2017;6(10):1049-1061.
Thippeswamy HM, Shivakumar BG, Balloli SS. Potassium transformation studies in lowland rice (O. sativa L.) as influenced by levels and time of K application. Journal of Potassium Research. 2000;16:7-11.
Das K, Singh SK, Shyampura RL. Forms of potassium in relation to land form and soil properties of Basaltic Terrain. Journal of Indian Society of Soil Science. 1993: 41(2): 557-559.
Kalyani K, Sailaja V. Rao CP. Potassium Fractions in Soil and Response of Cauliflower (Brassica oleraceavar. Botrytis) in Coarse Textured Soils of Rangareddy District. Journal of Indian Society of Soil Science. 2015;63(1): 69-74.
Bansal SK, Trehan SP. Effect of potassium on yield and processing quality attributes of potato. Karnataka Journal of. Agricultural. Science. 2011;24(1):48-54.
Swetha P, Solanki D, Kumari S, Savalia SG. Effect of potassium and sulphur on yield and yield attributes of pop corn (Zea mays Var. Everta). International Journal of Current Microbiology and Applied Science. 2017; 6(8):646-655.
Balyan JK, Singh P, Kumpawat BS, Jain LK. Effect of integrated nutrient management on maize (Zea mays L.) growth and its nutrients uptake. Current agriculture. 2006;30(1-2):79-82.
Paramasivan M, Kumaresan KR, Malarvizhi P, Mahimairaja S, Velayudham K. Effect of different levels of NPK and Zn on yield and nutrient uptake of hybrid maize (COHM 5) (Zea mays L.) in Mayamankuruchi (Myk) series of soils of Tamil Nadu. An Asian Journal of Soil Science. 2010: (5)1:157-161.
Ujwala Ranade M. Interaction of micronutrients with major nutrients with special reference to potassium. Karnataka Journal of Agricultural Science. 2011;24(1):106-109.
Sanjeev Kumar, Shivadhar, Ashok Kumar., Dileep Kumar. Yield and nutrient uptake of maize (Zea mays)–wheat (Triticum aestivum) cropping system as influenced by integrated potassium management. Indian Journal of Agronomy. 2015;60(4):511-515.
Patil S, Basavaraja PK, Parama VRR, Chikkaramappa, Sheshadri T. Effect of Different Sources and Levels of K on Maize (Zea mays L.) Yield, Nutrient Content and Uptake by Maize Crop in Low K Soils of Eastern Dry Zone of Karnataka, India. International Journal of Current Microbiology and Applied Science. 2017;6(8):577- 587.
Anonymous. Annual progress report. AICRP on Long Term Fertilizer Experiments to study the changes in soil quality, crop productivity and sustainability. IISS, Bhopal; 2006.
Lungmunana Bose A., Ghosh I, Ghosh SK, Patra PK. Distribution and variation of potassium in rice growing soils of red and laterite zone of West Bengal. Journal of Indian Society of Soil Science. 2014;62(1):84-87.