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2010 - 20172
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Author: Suman × End date: 2019 × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Residue dynamics and leaching potential of chlorantraniliprole in chilli crop
    (CCSHAU, 2017) Suman; Sushil
    The main objective of this study was to understand the persistence behaviour of new novel insecticide chlorantraniliprole (coragen 18.5 SC) in chilli fruit and its leaching behaviour in sandy loam soil. Recovery experiments were carried out at 0.01 and 0.05 μg/g fortification level in both chilli and soil samples for which average recoveries were found to be 85.23% and 87.46% in chilli samples and 85.92% and 87.11% in soil samples respectively. For dissipation / persistence study a field experiment was conducted following application of single dose (30 g a.i./ha) and double dose (60 g a.i./ha) on chilli crop. The initial residues of CAP at single and double doses were 3.16 and 4.68 mg/kg. Residues persisted upto 7th and 15th day in single and double doses respectively, after which BDL (0.01 mg/kg) comes. For single dose half-life value was of 1.18 days with degradation rate constant (k) value of 0.58 day -1. For double dose half-life was 2.05 days with degradation rate constant (k) value of 0.33 day-1. Leaching behavior of CAP in soil was studied at single (5.6 μg) and double dose (11.2 μg) respectively, for which soil plexi columns were packed and percolated with 35 ml of tap water after each 24 hours. Total amount of CAP recovered out of 5.6 and 11.2 μg were 82.40% and 81.42% from single and double doses respectively. Maximum retention of pesticide in both doses was in 0-5 cm soil core i.e. 79.82% in single dose and 79.11% in double dose. None of the leachate fractions from both the treatments showed the presence of chlorantraniliprole residue considering it safe for ground water table after field application.
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    Screening and characterization of Mesorhizobium ciceri isolates for antagonistic effect to Fusarium oxysporum f. sp. ciceri
    (CCSHAU, 2010) Suman; Yadav, A.S.
    Screening and characterization of Mesorhizobium ciceri isolates for antagonistic effect to Fusarium oxysporum f. sp. ciceri” was investigated on 207 isolates obtained from the nodules of chickpea plant. The growth of these 207 isolates was checked on YEMA Congo red medium. Out of 207 isolates, 117 were fast growing and 90 were slow growing rhizobia. These 207 isolates were screened for their anagonistic effect against Fusarium oxysporum. Out of 207 isolates, seven isolates were found to be antagonistic to F. oxysporum. Size of inhibition zone varied among the seven isolates from 5 mm to 15 mm. MC99 produced the largest inhibition zone. These seven isolates were further studied for antibiotic, siderophore, indole acetic acid (IAA) production and phosphate solubilization. None of the seven isolates was producing antibiotic. Out of these seven isolates, MC84, MC96, MC99 were producing siderophore and MC69, MC180, MC183 and MC190 were not producing siderophore. So, the mechanism of antagonism might be different in all these isolates. All the seven isolates were produing IAA, which varied among these isolates. The isolate MC99 was producing maximum indole acetic acid. None of the seven isolates was solubilizing tricalcium phosphate. In the present study, the isolate MC99 was found to be having maximum antagonistic activity against F. oxysporum, as it produced maximum zone of inhibition against this fungus. It had also the maximum amount of IAA and siderophore.