Abstract
This research work explores the productive performance of local paddy landraces under different fertility levels as well as the role of microbial inoculants in improving the yields of paddy landraces and reducing nutrient additions by increasing nutrient use efficiency under changing climatic scenarios in coastal areas. The landrace Padmarekha recorded taller plants, more tillers per hill, higher total dry matter accumulation other than grain and straw yields besides better uptake of N, P2O5, K2O, S and Zn. Further, nutrient management with the application of 100% of the recommended doses of fertilizers combined with biofertilizers including Azospirillum + Bacillus megatherium var. Phosphoticum + Frateuria quaratia + Thiobacillus thiooxidans + Vesicular Arbuscular Mycorrhiza recorded higher growth and yield traits in addition to improving the uptake of nutrients and partial factor productivity. Thus, it can be concluded that the application of 100% of the recommended dose of fertilizer, inoculated with biofertilizers, would be helpful in increasing the efficiency of applied nutrients in addition to improving yield and nutrient use efficiency.
Highlights
Rice (Oryza sativa L.) is a staple food crop of Asia that feeds more than half of the world’s population with high calorific value (78.2% carbohydrate, 6.8% protein, 0.5% fat and 0.6% mineral matter) [1]
The present study revealed that growth and yield of different local landraces were significantly influenced by the application of different biofertilizers under different fertility levels
Higher grain and straw yield was recorded with the landrace Padmarekha, with a mean yield of 6.62 t ha−1 and 7.47 t ha−1 respectively
Summary
Rice (Oryza sativa L.) is a staple food crop of Asia that feeds more than half of the world’s population with high calorific value (78.2% carbohydrate, 6.8% protein, 0.5% fat and 0.6% mineral matter) [1]. Further the other nutrients imbalances like phosphorus fixation due to soil acidity, micronutrient deficiencies lead to deteriorate soil fertility affecting the yield of rice These traditional landraces might have acted as a “selective filter” on the associated nutrient fixing/mobilizing bacterial population such that only more efficient genotype/bacteria interactions were established over the years. Technological innovation with respect to nutrient management by integrating different nutrient sources for improving nutrient use efficiency is essential to increase productivity of paddies in coastal areas Keeping these points in view, the present investigation was carried out in farmers’ fields in the coastal climate of Mirjan village of the Kumta Taluk, Uttara Kannada district of Karnataka, India to study the impact of biofertilizer and chemical fertilizer combinations on the growth and development of local paddy landraces
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