A novel premix formulation of Chlormequat chloride and Tebuconazole for lodging prone crops: Development and evaluation in wheat crop
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Date
2020
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DIVISION OF AGRICULTURAL CHEMICALS ICAR-INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Abstract
Amongst the various physiological stresses faced by wheat, lodging is one
major limiting factor in wheat production. One approach to induce lodging
resistance is through application of plant growth retardants. Chlormequat chloride
and azole group of fungicides like Tebuconazole have been reported effective
individually or together in reduction of plant height during early stages in gibberellic
acid production. So far, the tank mix composition has been registered in European
countries but there is no report on premix formulation. Present work reports
preparation, evaluation and physicochemical analysis of a novel premix suspension
concentrate formulation of CCC and Tebuconazole. Micronization process through
dry milling was standardized to achieve Tebuconazole microparticles in 2-5 µm
range. Auxiliaries to be used in formulation namely dispersing and wetting agent
(surfactant) and suspending agent (thickener) were identified and standardized w.r.t
their stability parameter, suspensibility (CIPAC MT 161). Concentration levels of
both the auxiliaries found effective in making a stable formulation were 5.1-5.8% for
surfactant B and 0.28-0.5% for thickener type C respectively. The active ingredient
load in the final SC formulation was (CCC+ Tebuconazole, 40-60%+7.5-15%) SC.
The formulation passed all the physicochemical tests prescribed by CIPAC for SC
formulation and was found stable under accelerated storage conditions for 14 days
and at 0 C for 7 days. The prepared formulation registered superior bio efficacy
results in pot (50% and 19.7% reduction in plant height over control and tank mix,
respectively) and field conditions (37% and 29.5% height reduction over control and
tank mix, respectively). Study on CCC and Tebuconazole residues and persistence in
grain and soil showed that after 60 days, ~98% dissipation was there for both the
active ingredients. Half-life of CCC ranged from 10.56-12.33 days and that of
Tebuconazole from 9.8-11.58 days.
Keywords: Premix, suspension concentrate, CCC, growth retardant, lodging
Description
T-10350