Microbial and nutrient dynamics as influenced by organic and inorganic inputs in rice grown in Inceptisols
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Date
2021-03
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigation entitled “Microbial and nutrient dynamics as influenced by organic and inorganic inputs in rice grown in Inceptisols” was carried out at Research Farm, SKUAST-Jammu, Main Campus, Chatha during the year 2018-19. The experiment was conducted on rice cultivar Basmati-370 under randomized block design (RBD) with eight treatments replicated thrice. The treatment comprised of organic and inorganic inputs at different application rates. Data was recorded on various parameters viz. physico-chemical and biological properties of soil. Results from our experiment revealed that, maximum azotobacter count at different crop growth stages viz. before tillering, tillering, panicle initiation and harvesting was recorded under T5 (50% Nitrogen through FYM + 50% Nitrogen through vermicompost) i.e. 9.33 cfu ml-1, 24.33 cfu ml-1, 24.66 cfu ml-1 and 12.66 cfu ml-1, respectively. Maximum phosphorous solubilizing bacterial count was also recorded under treatment T5 at different crop growth stages viz. before tillering, tillering, panicle initiation and harvesting i.e. 18.67 cfu ml-1, 31.33 cfu ml-1, 32.00 cfu ml-1 and 19.00 cfu ml-1, respectively. Among enzymes, four Bacillus species strains of urease (B2, B6, B7 and B8) from treatments T2 (100 % NPK), T6 (50% Nitrogen through FYM + 50% Nitrogen through inorganic fertilizer), T7 (50% Nitrogen through vermicompost + 50% Nitrogen through inorganic fertilizer) and T8 (25% Nitrogen through FYM + 25% Nitrogen through vermicompost + 50% Nitrogen through inorganic fertilizer) showed the colour change from yellow to pink (+). In amylase, three Bacillus isolates from T3 (FYM 9 t/ha) and T4 (Vermicompost 3 t/ha) showed the zone of clearance and in lipase only three isolates of Pseudomonas species from treatment T3 showed the zone of clearance. Among soil associated enzymes, maximum dehydrogenase activity was recorded under treatment T3 (before tillering), T8 (tillering and panicle initiation) and T4 (harvesting) i.e. 42.60 µg TPF g-1 soil 24 hr-1, 55.40 µg TPF g-1 soil 24 hr-1, 69.30 µg TPF g-1 soil 24 hr-1 and 33.93 µg TPF g-1 soil 24 hr-1, respectively. On the other hand, maximum acid phosphatase activity was recorded under T2 at (before tillering, tillering and panicle initiation) and T6 at (harvesting) i.e. 48.40 µg PNP g-1 soil hr-1, 36.20 µg PNP g-1 soil hr-1, 52.40 µg PNP g-1 soil hr-1 and 42.49 µg PNP g-1 soil hr-1, respectively. However, maximum microbial biomass carbon before tillering, tillering, panicle initiation and harvesting i.e. 33.15 mg kg-1, 35.47 mg kg-1, 36.71 mg kg-1 and 38.15 mg kg-1, respectively was recorded under T8. Different physico-chemical properties of soil viz. pH and electrical conductivity were not affected significantly by organic and inorganic inputs. At different crop growth stages viz. before tillering, tillering, panicle initiation and harvesting, soil pH range varied from 6.87 in T6 to 6.99 in T7, 6.83 in T6 to 6.94 in T2, 6.70 in T4 to 6.94 in T2 and 6.68 in T6 to 6.91 in T1, respectively. The maximum EC before tillering stage, 0.16 dS m-1 was recorded under treatments T2 and T7, at tillering stage, maximum EC (0.17 dS m-1) was recorded under T2, at panicle initiation stage, maximum EC (0.16 dS m-1) was recorded under T1 and T2 and at harvesting stage, maximum EC was recorded under T1 (0.16 dS m-1). However, at different crop growth stages viz. before tillering, tillering, panicle initiation and harvesting, maximum organic carbon was recorded under T3 i.e. 0.56 %, 0.54 %, 0.56 % and 0.55 %, respectively. Maximum available nitrogen was recorded under T8 at (before tillering, tillering and panicle initiation) and T3 (harvesting) i.e. 217.73 kg ha-1, 215.95 kg ha-1, 211.15 kg ha-1 and 210.00 kg ha-1, respectively. Maximum available phosphorous i.e. 15.33 kg ha-1, 12.49 kg ha-1, 10.99 kg ha-1 and 10.35 kg ha-1 was recorded under T2 (before tillering, tillering, panicle initiation) and T8 at (harvesting), respectively. However, maximum available potassium at different crop growth stages viz. before tillering, tillering, panicle initiation and harvesting was recorded under T2 (160.13 kg ha-1), and T3 (150.24 kg ha-1), (149.04 kg ha-1) and (148.21 kg ha-1), respectively. Grain yield and total nutrient uptake (N, P and K) was significantly influenced by both organic as well as inorganic amendments. Maximum grain yield (3.36 t ha-1) was recorded under T8 (25% Nitrogen through FYM + 25% Nitrogen through vermicompost + 50% Nitrogen through inorganic fertilizer). The maximum uptake of nitrogen, phosphorous and potassium was also recorded under T8 i.e. 75.27 kg ha-1, 17.98 kg ha-1 and 60.70 kg ha-1, respectively
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Preferred for your work: Divyansh. 2021. Microbial and Nutrient Status as influenced by Organic and Inorganic inputs under Rice grown in inceptisols.