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Subject: Agronomy × Author: Baswana, Jagjit × End date: 2008 × Start date: 2005 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Persistence of sulfosulfuron in different soils
    (CCSHAU, 2005) Baswana, Jagjit; Malik, R.K.
    A pot culture study entitled “Persistence of sulfosulfuron in different soils” was undertaken during 1998 in the Department of Agronomy, Chaudhary Charan Singh Haryana Agricultural University, Hisar. Qualitative estimation of sulfosulfuron residues at different concentrations (0.39, 0.78, 1.56, 3.12, 6.25, 12.5, 25, 50 ppb) and incubation periods (0, 10, 20, 40, 80,160 days) in two soil media (Hisar and Karnal soil) was undertaken using moongbean as test plant. Hisar soil was sandy loam in texture, low in available N (158 kg ha-1), organic carbon (0.34 %), available P(15 kg ha-1) and high in available K (370 kg ha-1) with a pH of 8.1, whereas, Karnal soil was clay-loam in texture, medium in available N (188 kg ha-1), available P ( 21kg ha-1), organic carbon (0.41%), high in available K (389 kg ha-1) with a pH of 8.3. Residual impact of sulfosulfuron at different incubation periods and herbicide concentrations in the two soils was assessed by recording various growth indices of moongbean at 21st days after sowing. The data recorded on visual phytotoxicity at 21st days after sowing was subjected to probit analysis for computing GR50 values and curve fitting. The residual behaviour of sulfosulfuron reflected in terms of various growth indices was almost identical in Hisar and Karnal soils. Growth parameters of moongbean increased with increase in incubation periods from 0-160 days, while, reverse was true with the increase in herbicide concentrations from 0.0 to 50 ppb. After 160 days, on an average there was 15.4 and 21.5 % reduction in various growth indices of moongbean at 25 and 50 ppb, respectively. The GR 50 values at 160 days incubation were 4.75 and 5.75 times more than at 0 day incubation in Hisar and Karnal soils, respectively. The half-life of sulfosulfuron in Karnal soil was 70 days while it was 76 days in Hisar soil. Moongbean was found suitable test plant for quantitative estimation of sulfosulfuron residues in soil but more practicable, reliable and conclusive evidences can further be attained by comparing other sensitive plants like sorghum, maize, onion and cucurbits under actual field conditions.