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Performance of a Hand Operated Rotary Sprayer

M. Alam
Associate Profssor
Dept. of Farm Power & Machinery, Bangladesh Agricultural University, Mymensingh

M.D. Hussain
Professor
Dept. of Farm Power & Machinery, Bangladesh Agricultural University, Mymensingh

M.M. Huq
Associate Profssor
Dept. of Farm Power & Machinery, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

A hand operated rotary sprayer was fabricated by using locally available materials such as G.I. sheet, wood, rope .and,plastic,tube. Performance studies were carried out at different throughputs and spraying heights at normal walking speed. The field capacity of the sprayer was 0.49 ha/hr or 16.6L/ha at spraying height of 50 cm, nozzle speed of 2000 rpm, working speed of 2 km/hr, and spray discharge was 133.5 ml/min. The lateral distributions of the spray liquid from the rotary sprayer were measured. It was observed that about 65 oh of the total spray output was deposited within the radius of 50 cm of the rotary nozzle. The spray deposition in different heights on paddy plants was measured. The maximum deposition was found at the top of the plant. During spraying operation:pulse and respiration rate of operator were recorded. The spraying cost was about US$ 3.5/acre.

Keywords: Performance, Hand operated rotary sprayer

Location: Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Farm Mechanization

Non-commodity: Performance

Objectives:

(i) To test and evaluate the sprayers at laboratory and field condition.

(ii) To carry out the ergonomic studies.

Methodology:

A wheel made of wood was used to provide rotational speed to the shaft of the disc with the help of a ropb. The rpm of the wheel was recorded by counting the number of the turn per minute during operation. The disc speed was calculated by using the following equation. N_N = (N_WD_W/D_N).Lateral distribution of spray deposit over the filter papers having 5 x 5 cm in size was measured. The filter papers were placed side by side up to a length of 200 cm on a table for receiving the spray deposit. The field capacity of the sprayer was recorded for different spraying heights. discharges and working speed. The spraying time was recorded by a digital stop watch. Some filter papers were placed from top to bottom of the plant.After spraying, the filter papers were collected and washed them by distilled water containing 0.3%o methanol. A self balancing turner fluorometer was used to quantify, the target deposition.The relative humidity, dry bulb temperature were measured by a digital hygrothermometer. Some ergonomic studies were carried out for the hand operated rotary sprayer. The effect of spraying time on forward speed, heart bit, rpm of nozzle and respiration rate were studied. The weight of the operator was measured by weighing machine. The age of the operator was also recorded during field work. The forward speed of the operator, nozzle speed, heart bit and respiration rate were recorded at an interval of 30 minutes. The pulse rate was recorded by crude method normally by hand touch procedure. The respiration rate was found out by counting the movement of hair placed in front of the nose. The linear distance was measured by a meter tape.

Source of Information: J. Agril. Mach. & Mech. 2(l),1995: 65-69 ISSN 1024-6290

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Both the pulse rate and respiration rate were increased with increasing the operating time. It was observed that the forward speed decreased with increasing the working period.

Knowledge Management: Journal