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Slip on ring spraying devices for spot application of chemicals to control Eriophyid mite in coconut

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Title Slip on ring spraying devices for spot application of chemicals to control Eriophyid mite in coconut
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Creator Manian, R., K.Kathirvel, T.Senthilkumar and Binisam
 
Subject Coconut tree, sprayer, nozzle, height, discharge
 
Description Not Available
Recently the coconut farmers were faced with harrowing times due to minute pest attack on coconut. The sudden outbreak of Eirophyid mite in coconut plantations has threatened the very survival of the copra industry in Southern India. To control the mite attack, spot application of pesticides is recommended as one of the remedial measures for which a slip on ring spraying device has been developed. The unit consists of a clamp, flexible hoses and nozzles. The unit is adjustable to suit any size of the coconut tree trunk. Flexible hoses with commercially available plastic (broad cone nozzles) nozzles are fixed to the delivery hoses surrounding the periphery of the clamp with the help of ‘T’ connectors. From the clamp all the flexible hoses are connected with main delivery line, which extends up to the bottom of the tree so that it can be attached with the commercially available rocker sprayer for spraying the chemical. Any number of flexible hoses with nozzle can be attached to the clamp. The cost of the unit for covering four to six bunches was Rs. 200 to 300 without the spraying unit. One set of clamp with required number of flexible hoses and nozzles, delivery pipe from the bottom of the tree have to be permanently fitted to each tree. Two persons are required to operate and move the sprayer unit in the coconut gardens. With rocker sprayer 20 to 2 trees can be sprayed per hour and with engine operated sprayer 25 to 30trees can be sprayed in an hour. The discharge rate was measured at different pressure heads viz, 2.5, 5, 7.5 and 10 kg/cm2 for different heights ranging from 3 to 15 m by changing the nozzles from 1 to 4. The effect of spray height and operating pressure on the discharge of sprayer was investigated. The pressure coefficient is positive and significant indicating that if the pressure is increased by 1 kg/cm2, the discharge is increased by 7.5 time at a given height for single nozzle, 15 times for two and four nozzles. The interaction coefficient between height and pressure is positive and significant indicating that increase in height increased the discharge by 0.15 times for one nozzle, decreased by 0.33 times for two, three and four nozzles. The height of spray has a negative correlation with discharge indicating that 1 m increase in height reduced the discharge by 1.83 time at given operating pressure. The unit can be used for spraying 30 trees per hour. The slip-on-ring spraying device results in 80 and 75 per cent savings in cost and time when compared to conventional method of spraying.
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Date 2021-07-14T08:56:15Z
2021-07-14T08:56:15Z
2004-12
 
Type Research Paper
 
Identifier Manian, R., K.Kathirvel* T.Senthilkumar and Binisam, 2004. Slip on ring spraying devices for spot application of chemicals to control Eriophyid mite in coconut. Agricultural Mechanization in Asia, Africa and Latin America, 35(1): 23-27
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http://krishi.icar.gov.in/jspui/handle/123456789/47920
 
Language English
 
Relation Not Available;
 
Publisher Not Available