Abstract:
Field experiments were conducted for two seasons in 1980-'81 at the College
of Agriculture, Vellayani for assessing the optimum volumes of insecticide suspension
required for treating rice crop at different growth stages of the crop using a pneumatic knapsack sprayer and mist blower. The results showed that the optimum
volumesof 0.2",, carbaryl suspension required to give highest deposits on leaves
were 200, 300, 500 and 500 I/ha in the case of a pneumatic knapsack sprayer and
90, 1 20, 1 80 and 1 80 I/ha in the case of a mist blower at 30, 45, 60 and 75 days
after sowing respectively. The optimum volumes thus obtained were correlated
with the leaf area indices of the respective stages of growth and relevant statistical
models were fitted for both the type of sprayers.
