Investigation of the Efficiency of Two Kinds of Sprayers Based on Electrostatic Charge and Spinning Disc in Comparison with Hydraulic Motorized Sprayer Carried on Trolley in the Control of Rice Blast

Document Type : Research Paper

Authors

1 Assistant professor, Iranian Reseach Institute of Plant Protection

2 Assistant professor, Agriculture and Natural Resources Research Center of Mazandaran

3 Senior Expert, Iranian Reseach Institute of Plant Protection

4 Senior Expert, Agricultural Engineering Research Institute

Abstract

Rice blast caused by Pyricularia grisea (Cooke) Sacc. is one of the most serious diseases of rice throughout  the world, which is generally controlled by fungicides. Appropriate  selection of sprayers with respect to the field conditions, increases the efficiency of pesticide application and reduces the environmental pollution. In this study the efficiency of five different types of sprayers namely: two types of  knapsack micronair sprayers ( Model: KP 4000-N10, and SKN-3000) as well as two types of electrostatic sprayers ( Model: motorized knapsack mist blower sprayer equipped with electrostatic head and Model: GPS-5 TM) were compared with hydraulic motorized sprayer carried on trolley using two doses (1 and 0/75 kg/ha of tricyclazole (Beam® WP 75%) applied on rice blast disease. The factorial experiment was carried out based upon a Randomized Complete Block Design (RCBD) of 3 replications. The results demonstrated that motorized knapsack mist blower sprayer equipped with electrostatic head, hydraulic motorized sprayer on trolley (conventional sprayer) as well as knapsack micronair sprayer ( Model: KP 4000-N10) were of  the highest efficiencies. The mean severities were estimated 1.67±0.13, 2±0.12 and 3.5±0.33 respectively. The pesticide solution taken up by the 3 sprayers were recorded as 48, 450 and 65 L/ha. respectively. This shows considerable reduction in the level of fungicide applied in the motorized knapsack mist blower sprayer equipped with electrostatic head and in knapsack micronair sprayer, leading to an increase in efficiency and decrease in operating costs. Evaluation through water-sensitive cards indicated that motorized knapsack mist blower sprayer (with electrostatic head) and knapsack micronair sprayer (Model: KP 4000-N10) led to a better distribution of droplets than hydraulic motorized sprayer carried on trolley did. It is recommended that the above mentioned technique be only applied to leaf rice blast, since it can not be beneficial to the crop when it is at its panicle stage and tall.

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History

  • Receive Date: 06 February 2011
  • Revise Date: 25 November 2013
  • Accept Date: 26 April 2012

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