Himachal Journal of Agricultural Research

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Microbiological Properties of Soil Influenced by Weed Control Methods in Maize-Pea Cropping System under Mid Hill Conditions of Himachal Pradesh


Affiliations
1 Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India
 

The present investigation was undertaken in an ongoing experiment on maize-pea cropping system to study the effect of weed control methods on population of soil beneficial bacteria such as Azotobacter, Phosphate solublising microorganisms, basal soil respiration and microbial biomass carbon after the harvest of maize crop over a period of three years from 2010 to 2012. In maize, there were five weed control treatments viz. weedy check; mechanical weedings; atrazine 0.75 kg/ha pre-emergence; atrazine 1.5 kg/ha pre-emergence; atrazine 0.75 kg/ha fb. 2,4-D 0.5 kg/ha) and in pea there were four treatments viz, weedy check; mechanical weeding; pendimethalin 1.0/1.25 kg/ha pre- emergence; pedimethalin 0.75 kg/ha fb mechanical weeding. Weed control treatments in maize resulted in significant variation in the count of Azotobacter and phosphate solublizing microorganisms. Population of Azotobacter was significantly higher under pre-emergence application of atrazine 1.50 kg/ha (14.93x104 cfu/g dry soil), mechanical weeding (14.46x104 cfu/g dry soil), and atrazine 1.0 kg/ha fb. 2,4-D 0.5 kg/ha (13.70x104 cfu/g dry soil) over atrazine 1.0 kg/ha fb hand weeding. Atrazine 1.50 kg/ha and atrazine 1.0 kg/ha fb. 2,4-D resulted in significantly higher count of phosphate solublizing microorganisms over mechanical weeding. Weed control in maize also did not show any significant influence in soil pH, soil organic carbon, microbial biomass carbon and basal soil respiration. Weed control treatment in pea gave significant variation in count of Azotobacter, phosphate solublising microorganisms, basal soil respiration and microbial biomass carbon. Population of Azotobacter was highest under mechanical weeding. Pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding had lower population than mechanical weeding. The population of phosphate solublizing microorganisms was significantly higher under pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding over mechanical weeding alone. Weed control treatments applied in pea did not significantly influence the count of Azospirillum, pH, and organic carbon after the harvest of maize. Pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding had higher microbial biomass carbon over mechanical weeding alone. Pendimethalin had significant decrease in soil respiration after the harvest of maize which is an important indicator of soil biological health.

Keywords

Azotobacter, Maize-Pea Cropping System, Microbiological Properties, Weed Control Methods.
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  • Microbiological Properties of Soil Influenced by Weed Control Methods in Maize-Pea Cropping System under Mid Hill Conditions of Himachal Pradesh

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Authors

Rajinder Kumar
Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India
Dinesh Badiyala
Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India
Neelam Sharma
Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India
S. S. Rana
Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India
Pawan Pathania
Department of Agronomy, Forages and Grassland Management, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, India

Abstract


The present investigation was undertaken in an ongoing experiment on maize-pea cropping system to study the effect of weed control methods on population of soil beneficial bacteria such as Azotobacter, Phosphate solublising microorganisms, basal soil respiration and microbial biomass carbon after the harvest of maize crop over a period of three years from 2010 to 2012. In maize, there were five weed control treatments viz. weedy check; mechanical weedings; atrazine 0.75 kg/ha pre-emergence; atrazine 1.5 kg/ha pre-emergence; atrazine 0.75 kg/ha fb. 2,4-D 0.5 kg/ha) and in pea there were four treatments viz, weedy check; mechanical weeding; pendimethalin 1.0/1.25 kg/ha pre- emergence; pedimethalin 0.75 kg/ha fb mechanical weeding. Weed control treatments in maize resulted in significant variation in the count of Azotobacter and phosphate solublizing microorganisms. Population of Azotobacter was significantly higher under pre-emergence application of atrazine 1.50 kg/ha (14.93x104 cfu/g dry soil), mechanical weeding (14.46x104 cfu/g dry soil), and atrazine 1.0 kg/ha fb. 2,4-D 0.5 kg/ha (13.70x104 cfu/g dry soil) over atrazine 1.0 kg/ha fb hand weeding. Atrazine 1.50 kg/ha and atrazine 1.0 kg/ha fb. 2,4-D resulted in significantly higher count of phosphate solublizing microorganisms over mechanical weeding. Weed control in maize also did not show any significant influence in soil pH, soil organic carbon, microbial biomass carbon and basal soil respiration. Weed control treatment in pea gave significant variation in count of Azotobacter, phosphate solublising microorganisms, basal soil respiration and microbial biomass carbon. Population of Azotobacter was highest under mechanical weeding. Pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding had lower population than mechanical weeding. The population of phosphate solublizing microorganisms was significantly higher under pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding over mechanical weeding alone. Weed control treatments applied in pea did not significantly influence the count of Azospirillum, pH, and organic carbon after the harvest of maize. Pendimethalin 1.20 kg/ha and pendimethalin 0.75 kg/ha fb mechanical weeding had higher microbial biomass carbon over mechanical weeding alone. Pendimethalin had significant decrease in soil respiration after the harvest of maize which is an important indicator of soil biological health.

Keywords


Azotobacter, Maize-Pea Cropping System, Microbiological Properties, Weed Control Methods.

References