Effect of crop establishment practices and microbial inoculation on nutrient uptake and productivity of summer green gram [Vigna radiata (L.) Wilczek]
Y p Singh
2019
M.Sc
A field experiment was carried out during summer season in 2018 at ICAR-Indian Agricultural Research Institute, New Delhi to study “Effect of crop establishment practices and microbial inoculation on nutrient uptake and productivity of summer green gram [Vigna radiata (L.) Wilczek]”. The experiment was laid out in split plot design and treatments replicated thrice. The experiment included nine treatment combinations including three crop establishment practices viz., conventional tillage, zero tillage and zero tillage with chick pea residue @ 2.5 t/ha in main plot and three microbial inoculation treatment viz., control (no inoculation), inoculation of Rhizobium + PSB and inoculation of Rhizobium + Phosphate Solubilizing Bacteria (PSB)+ Arbuscular Mycorrhizal (AM) Fungi in sub-plots. The soil of the experimental field was sandy loam in texture. Soil was low in organic carbon, low in N and medium in available phosphorus and medium in available potassium. Results showed that the growth parameters of green gram (plant height, number of plants/m2, dry matter accumulation, leaf area index, no. of branches/ plant, no. of root nodules/plant and root nodule weight/ plant), yield attributes (No of plants/ m2 , no. of pods/ plant, pod length, no. of grains/ pod and 1000- grain weight) and yield (grain and stover) were significantly influenced due to methods of crop establishment and microbial inoculants. Among treatments having three method of crop establishment, the highest values of all these parameters were recorded in treatment having zero tillage with residue. The highest grain yield was recorded in zero tillage with residue (968.8 kg/ha), which was significantly higher than conventional tillage (920.6 kg/ha) and zero tillage (674.7 kg/ha). Treatments having microbial inoculation treatments showed significant differences in plant growth, yield attributes and yield of grain and stover. The highest seed yield was recorded with combined inoculation of Rhizobium+ PSB + AM Fungi (906.7 kg/ha) and it was significantly higher than Rhizobium+ PSB (940.7 kg/ha) and control (813.5 kg/ha). Green gram crop gave highest gross return ( 75083.8) and net returns ( 47432.5) under zero tillage with residue but benefit cost ratio was highest under conventional tillage. Among microbial inoculation treatment highest gross returns, net returns and net B: C were recorded in combined inoculation of Rhizobium+ PSB + AM Fungi. N, P, K and micronutrients (Fe, Zn, Mn and Cu) concentrations and uptake in grain and stover of green gram were significantly increased by the zero tillage with residue over conventional tillage and zero tillage. Among the microbial inoculation treatments, maximum N, P, K and micronutrients (Fe, Zn, Mn and Cu) concentrations and uptake were recorded with combined inoculation of Rhizobium+ PSB + AM Fungi followed by Rhizobium+ PSB and control. There was slight built up in available N, P, K and micronutrients (Fe, Zn, Mn and Cu) in soil at crop harvest due to method of crop establishment method and microbial inoculation. Soil microbial parameters viz., dehydrogenase activity, alkaline phosphatase and microbial biomass carbon were greater in zero tillage with residue and Rhizobium+ PSB + AM Fungi, respectively over other treatments. It may be concluded that Rhizobium+ PSB + AM Fungi be inoculated with summer green gram grown under zero tillage with residue to get higher crop growth, productivity and profitability. Besides productivity this combination can improve the grain quality and soil health. 115 Keywords:
en_US
DIVISION OF AGRONOMY ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Agronomy
Effect of crop establishment practices and microbial inoculation on nutrient uptake and productivity of summer green gram [Vigna radiata (L.) Wilczek]
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