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Vol. 10, Issue 9 (2021)

Impact of various nutrient sources on soil microbial population under pearl millet-wheat cropping system

Author(s):
Babli, Pawan Kumar and Mohinder Singh
Abstract:
Background: Soil quality, availability of nutrients, biological health of soil and environmental conditions are important criteria for improving crop yield to achieve food security. In North-Western region of India, pearl millet [Pennisetum glaucum (L.)] and wheat (Triticum aestivum L.) is one of the vital cropping systems. Due to low organic matter content of soil in this region, fertility of soil is very important for obtaining optimum crop production. The quality of soil organic matter and carbon and nitrogen inputs are the overriding controls to obtain sufficient soil microbial biomass for efficient biogeochemical functioning. Various organisms present in the soil play vital roles in biological nitrogen fixation and solubilization of phosphorus leading to enhanced plant growth. The current study was aimed to evaluate the impact of various nutrient sources on the population of nitrogen- fixing (diazotrophs) bacteria and phosphorus solubilizing bacteria (PSB) under pearl millet-wheat cropping system.
Methods: The experiment was conducted at the permanent plots of integrated nutrient management on cereal based cropping system, which has been started from Kharif 1985. The current experiment was conducted for two years (2015-16 to 2016-17) on permanent plots to evaluate the effect of various nutrient sources on the population of diazotrophs and PSB at Agronomy Research Farm, CCS Haryana Agricultural University, Hisar (India). Surface soil samples (0-15 cm) were collected from the different treatments at two stages of plant growth i.e., one sample before sowing of the crop and another sample at the time of flowering of crop. Soil samples were processed and analyzed for population of nitrogen-fixing Azotobacter and phosphorus solubilizing bacteria.
Result: During the first year of pearl millet cultivation, the population of Azotobacter was 34% higher in T6 than T5 at the time of flowering, whereas the population of Azotobacter was 28% higher in T6 during the second year than T5. Similarly, the population of PSB was found 17% and 15% higher in T6 than T5 during first and second year, respectively at the time of flowering in pearl millet crop. The bacterial count analysis in case of wheat crop showed that total bacterial population increased from 19.5 × 107 (cfu/g soil) to 19.6 × 107 (cfu/g soil) during first and second year, respectively at the flowering time. It was observed that the population of Azotobacter, PSB and total bacteria was higher in the treatment T6 among all the treatments. Results suggested that the quality of soil organic matter and inputs of carbon and nitrogen are the important factors, which affect soil microbial biomass and microbial beneficial functions.
Pages: 1137-1141  |  318 Views  143 Downloads


The Pharma Innovation Journal
How to cite this article:
Babli, Pawan Kumar, Mohinder Singh. Impact of various nutrient sources on soil microbial population under pearl millet-wheat cropping system. Pharma Innovation 2021;10(9):1137-1141.

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