• G Chopra

      Articles written in Proceedings – Animal Sciences

    • Effects of ecological factors on the performance of rodenticides in sugar cane

      V R Parshad Nafis Ahmad G Chopra

      More Details Abstract Fulltext PDF

      The sugar cane fields located near river Sutlej at Ladhowal (Lat. 30° 56’N, Long. 75° 52’E) were found infested with 4 rodent species namely,Bandicota bengalensis, Rattus meltada, Tatera indica andMus spp. Of these,B. bengalensis was most predominant. Compared to the adjoining wheat, paddy and mung crops the sugar cane fields at growth and maturity stages harboured high rodent population due to frequent waves of rodent immigration as a result of heavy rainfall and flooding of paddy fields in August and September and agronomic operations related to paddy-wheat rotation in most of the fields. Multiple poison baiting of rodents with brodifacoum (0·005%) and zinc phosphide (2·4%) in different fields of sugar cane resulted in significant differences in their performance within and between the fields. With these poisons the rodent control success ranged from 23·0–45·6% in the months of August and September and 68·1–93·4% in October to December. Overall reduction in post-control activity of rodents ranged from 47·2–96·1% in different fields with different poison combinations. The rodent control success seemed to be related to the differences in rodent populations, post-control reinfestation rates, timings of poison baiting, stage of crop development, weather conditions and sowing and harvesting operations in the adjoining crop fields. The environmental factors particularly affected the post-control reinfestation of rodents which as compared to the reference fields (0·35 rodents/100 traps/day) was significantly higher in the treated fields (0·56–2·33 rodents/100 traps/day).

    • Role of soil fauna in decomposition of rice and sorghum straw

      Arun Lekha G Chopra S R Gupta

      More Details Abstract Fulltext PDF

      This study examines the mass loss patterns and meso-invertebrate populations during rice and sorghum straw decomposition, using litter-bag technique, in an agricultural system at Kurukshetra (29°58’N, 76°51’E, 250 m above mean sea level). The decomposition rates were influenced by litter quality, soil and litter moisture, leaching of water soluble substances, and colonization by the meso-invertebrates. During the cropping season, wet soil conditions favoured rapid decomposition rates. For the total sampling period of 285 days, the mass loss of rice and sorghum straw was 78·2 and 82% respectively. The single exponential model described the pattern of decomposition over time (r2=0·88,Ps0·001). Meso-invertebrate populations were higher during rapid phase of decomposition and influenced by soil and litter moisture. Maximum meso-invertebrate density per litter bag was 77·4±6·12, for rice straw and 78·4±3·05 for sorghum straw. Collembola and mites were the dominant groups of fauna in litter bags. Enchytraeids formed 2·45% of the total meso-invertebrates extracted from litter bags.

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