Book of Extended summaries ISDA
Book of Extended summaries ISDA Book of Extended summaries ISDA
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad T4-32P-1310 Soil Microbial Dynamics as Influenced By Crop Residue Management Practices In Legume-Cereal Sequence Ammaji Pydi Acharya N.G. Ranga Agricultural University Agricultural College, Rajamahendravaram India has a long history of agricultural activitiesand produces a vast amount of crop residues, the annual production of crop residues in India is estimated over 500 million tons (Mt). There exists a large variability among the crops with regard to the production of crop residues. Furthermore, residueproductionhasalsoincreasedsubstantiallywith intensive agricultural practicesTheseinclude organic matter decomposition and nutrient cycling, including carbon(C) and nitrogen (N) cycling and soil aggregate formation and maintenance. Furthermore, the size of the microbial population in agricultural soils can be affected bythe availabilityof organic matter and managementpractices. The legume-Maize sequence is animportant cropping system followed in a large extent of area in Andhra Pradesh and Telangana states. Grain legumes were cultivated during the Kharifseason and after harvesting the economic yield the harvested remnants are either used as animal feed or else burned to clear the succeeding crop. Maize is an exhaustive crop for nutrients and responds positively toan increase in the level of nitrogen fertilizers. Furthermore, Intensive agricultural practices ignorethe addition of organicnutrient sourcesresulting in the manifestation of nutrient deficiencies. Toformulate an ideal nutrient management strategy to increase the yields and sustain soil health, an attempt was made to know the soil microbial dynamics ofwith incorporation of crop residues in the legume- Maize sequence Methodology A field experiments were conducted at Agricultural College farm, Aswaraopet, Khammam (Dist.) Telangana state for two consecutive years. The investigation was carried out with an objective to find out microbial dynamics as influenced by the crop residue incorporation of kharif legumes, residue management practices and the treatments consisted of three legumes, viz., cowpea, (M1) field bean (M2) and greengram (M3) as main plot treatments during the kharif season and two residue management practices viz., residue removal (I1) and residue incorporation (I2) as sub- plot treatments. Four nitrogen levels 75 kg ha -1 (N1), 150 kg ha -1 (N2), 225 kg ha -1 (N3) and 300 kg ha -1 (N4) as sub- sub plot treatments allocated to maize during rabi season. Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming, INM, soil-microorganisms-plant interactions 517 | Page
International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad The yield of kharif legumes, growth parameters, yield and yield attributes of rabi maize were recorded. The soil samples were collected from the experimental plots for enumerating the microbial population before sowing and after harvest of different legumes, after incorporation of the crop residues, before sowing of maize and after harvest of maize was estimated by following the standard dilution plate count technique by pour plate technique Nutrient agar (NA) for bacteria, Martin’s rose bengal with streptomycin sulphate agar (MRBA) for fungi, Ashby’s agar for Azotobacter, Yeast Extract Mannitol agar (YEMA) with congo red for Rhizobium were used for enumeration. The petri plates were incubated after plating at 30 0 C for two to four days and population was counted and expressed as number of cells per gram on dry weight basis for bacteria,Azotobacter and Rhizobium and cfu g -1 of soil for fungi. Results Soil microbial population as affected by different management practices Soil microbial population was assessed at three stages viz., initial, after the harvest of the kharif legumes as well as after the incorporation of legumes and after the harvest of the rabi maize. On perusal of the data presented in the figure below revealed that there was an increase in microbial population compared to the initial population during both the years of study. Improvement in soil microbial population viz., total bacteria, rhizobium, azotobacter, actinomycetes and fungi was observed over the initial population when legumes were grown in kharif. Among the legumes, maximum number of soil micro flora was observed after the harvest of cowpea followed by field bean and greengram. The increase in number of soil microorganisms might be due to the abundance of the native bacteria in the soil. Similar results were also reported by George et al. (2007). 518 | Page Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming, INM, soilmicroorganisms-plant interactions
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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities<br />
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad<br />
T4-32P-1310<br />
Soil Microbial Dynamics as Influenced By Crop Residue Management<br />
Practices In Legume-Cereal Sequence<br />
Ammaji Pydi<br />
Acharya N.G. Ranga Agricultural University<br />
Agricultural College, Rajamahendravaram<br />
India has a long history <strong>of</strong> agricultural activitiesand produces a vast amount <strong>of</strong> crop residues, the<br />
annual production <strong>of</strong> crop residues in India is estimated over 500 million tons (Mt). There exists<br />
a large variability among the crops with regard to the production <strong>of</strong> crop residues. Furthermore,<br />
residueproductionhasalsoincreasedsubstantiallywith intensive agricultural practicesTheseinclude<br />
organic matter decomposition and nutrient cycling, including carbon(C) and nitrogen (N) cycling<br />
and soil aggregate formation and maintenance. Furthermore, the size <strong>of</strong> the microbial population<br />
in agricultural soils can be affected bythe availability<strong>of</strong> organic matter and<br />
managementpractices.<br />
The legume-Maize sequence is animportant cropping system followed in a large extent <strong>of</strong> area<br />
in Andhra Pradesh and Telangana states. Grain legumes were cultivated during the<br />
Kharifseason and after harvesting the economic yield the harvested remnants are either used as<br />
animal feed or else burned to clear the succeeding crop. Maize is an exhaustive crop for<br />
nutrients and responds positively toan increase in the level <strong>of</strong> nitrogen fertilizers. Furthermore,<br />
Intensive agricultural practices ignorethe addition <strong>of</strong> organicnutrient sourcesresulting in the<br />
manifestation <strong>of</strong> nutrient deficiencies. T<strong>of</strong>ormulate an ideal nutrient management strategy to<br />
increase the yields and sustain soil health, an attempt was made to know the soil microbial<br />
dynamics <strong>of</strong>with incorporation <strong>of</strong> crop residues in the legume- Maize sequence<br />
Methodology<br />
A field experiments were conducted at Agricultural College farm, Aswaraopet, Khammam<br />
(Dist.) Telangana state for two consecutive years. The investigation was carried out with an<br />
objective to find out microbial dynamics as influenced by the crop residue incorporation <strong>of</strong><br />
kharif legumes, residue management practices and the treatments consisted <strong>of</strong> three legumes,<br />
viz., cowpea, (M1) field bean (M2) and greengram (M3) as main plot treatments during the kharif<br />
season and two residue management practices viz., residue removal (I1) and residue<br />
incorporation (I2) as sub- plot treatments. Four nitrogen levels 75 kg ha -1 (N1), 150 kg ha -1 (N2), 225<br />
kg ha -1 (N3) and 300 kg ha -1 (N4) as sub- sub plot treatments allocated to maize during rabi season.<br />
Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming,<br />
INM, soil-microorganisms-plant interactions<br />
517 | Page