BIOCHEMICAL AND RESIDUE STUDIES OF TEMBOTRIONE IN MAIZE
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Date
2020-01-31
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CSKHPKV. Palampur
Abstract
A field experiment was laid out in randomized block design (RBD) consisting of five
treatments viz. tembotrione 60g/ha, tembotrione 120g/ha, tembotrione 240g/ha,
atrazine 1.5kg/ha and control to study the “Biochemical and residue studies of
tembotrione in maize” in the Department of Agronomy, CSK Himachal Pradesh
Krishi Vishvavidyalaya, Palampur during kharif season, 2019. Maize plant samples
were collected at monthly intervals (i.e. zero (2 hrs), 30, 60 days after the herbicide
application) and at harvest for biochemical analysis and grain samples at maturity of
crop for quality indices and for residue studies. Soil samples were collected at zero (2
hrs), 1, 3, 5, 7, 10, 15, 30, 45, 60 days and at harvest for the residue studies. Protein
content in maize plant was not influenced very distinctly with applied
treatments, except at 30 days. However, a numerical increase in total protein
content was noticed in tembotrione treatments over control. Total chlorophyll,
total carotenoids and total carbohydrates content in maize leaves increased
significantly with applied tembotrione treatments and maximum increase was
noticed in treatment tembotrione 120g/ha. A significant increase in total
carbohydrates content in maize grain over control was observed in all the herbicide
applied treatments. The residue data of tembotrione generated in present investigation
indicated that tembotrione 60g/ha, tembotrione 120g/ha and tembotrione 240g/ha
persisted in soil up to 30, 45 and 45 days, respectively. Approximately 75 per cent of
applied herbicide in soil dissipated within 15 days after herbicide application. The
dissipation of tembotrione in the soil at three rates of application i.e tembotrione
60g/ha, tembotrione 120g/ha and tembotrione 240g/ha followed first order kinetics
and the half –lives ranged from 9 to 14 days. Residues of tembotrione were below
detectable levels i.e. ≤0.025µg/g in maize grain and maize stover