RESEARCH PAPER
Response of some characteristics of selected beneficial soil microorganisms under different potassium fertilizer applications
 
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1
Department of Agro-environmental Chemistry and Plant Nutrition, Czech University of Life Sciences, rague, Kamýcká 129, Prague Suchdol, 165 00, Czech Republic
 
2
Sasya Shyamala Krishi Vigyan Kendra, Ramakrishna Mission Vivekananda and Educational Research Institute, Arapanch, Sonarpur, Kolkata-700150, West Bengal, India
 
 
Final revision date: 2021-10-24
 
 
Acceptance date: 2021-10-28
 
 
Publication date: 2021-11-19
 
 
Corresponding author
Jiřina Száková   

Department of Agro-environmental Chemistry and Plant Nutrition, Czech University of Life Sciences, rague, Kamýcká 129, Prague Suchdol, 165 00, Czech Republic
 
 
Int. Agrophys. 2021, 35(3): 289–299
 
HIGHLIGHTS
  • Increasing microbial population due to the potassium fertilizer application
  • Predominant importance of the incubation time and fertilizer rate than the fertilizer type
  • No adverse effect of K application on the beneficial microbial population of the soil
KEYWORDS
TOPICS
ABSTRACT
Among the three important nutrients of (NPK) for plants, potassium plays a vital role in increasing disease resistance capacity and also in the activation of over 80 different enzymes responsible for plant metabolism. This article presents changes in the population of some soil beneficial microorganisms responsible for the nutrient cycling process in the soil and in their respiration activity as related to the application of different potassium (K) fertilizers (KCl and K2SO4) at different doses in a model incubation experiment. The application of KCl and K2SO4 fertilizers increases soil acidity at higher doses. The parameters describing the soil microbial community, i.e. microbial respiration and colony forming unit counts of free living N2-fixing bacteria, Rhizobium sp., Pseudomonas sp., potassium-solubilizing bacteria, and phosphate-solubilizing bacteria increased with the application of fertilizers at lower doses, but a minor decrease was observed for higher doses of fertilizers. The level of microbial activity showed a positive correlation with the application of different amounts of fertilizer but no effect was observed due to the use of different fertilizer types, thereby indicating that a substantial improvement in soil biological activities can be achieved regardless of the K fertilizer type at optimized doses.
ACKNOWLEDGEMENTS
We are grateful to Swami Atmapriyanandaji Maharaj, Hon’ble Vice Chancellor of Ramakrishna Mission Vivekananda University (RKMVU) for his valuable encouragement. We also thank Dr. Indranil Das, Assistant Director of Agriculture, Fertilizer Control Laboratory, Govt. of West Bengal, Berhampore, Murshidabad for his contribution in the statistical calculations. Dr. Kathryn Wright, freelance editor and proofreader, UK, provided improvement of language.
FUNDING
The study was supported by European Regional Development Fund - NutRisk Centre No. CZ.02.1.01/0.0/0.0/16_019/0000845 (2018-2023).
CONFLICT OF INTEREST
The authors declare that they have no conflict of interest.
 
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