The microbial activities of soil in rice agroecosystem are influenced by agro-practices and nutrient regime. The levels of various macronutrients and their ratios determine the plant production. At the same time the soil microbial activities determine the nutrient mobilization and their availability to the rhizosphere. The current work was done at different combinations of nitrogen (N), phosphorus (P), potassium (K) to study the growth and production rate of rice (Oryza sativa L.) and the associated changes in soil microbial activity. During 120 days of observation (at 30 days interval), the shoot length showed continuous and significant increase up to 90 days and that of root showed significant increase up to 60 days. The biomass, on the other hand, showed continuous and significant increase with prolongation of cultivation. Each growth parameter showed the highest performance in the plot supplemented with NPK while the lowest was with the plot supplemented with K only. P supplementation was also found to be the most effective in enhancing the growth performance of the crop in the plots. Corresponding values of F0 and FM were also observed. As expected the maximum fluorescence yield was recorded in P amended plots, with or without other nutrients. The activities of invertase and amylase were the highest in the plot with manure (3 kg) and the lowest was observed in the unamended plots. No significant difference in the activities of these enzymes was observed among other nutrient amended plots during the period of observation.
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