Performance Evaluation of Laser Spray Irrigation System under Variable Rain Hose Pipe Lengths

Author: Kavita, Rajashekarappa K. S., Hanumanthappa, D. C. and Devappa

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Abstract

In order to standardize the rainhose pipe length, diameter and operating pressure under local topography the investigation is much needed at present water scarcity situation. Laser spray irrigation is an innovative alternative to conventional sprinkler irrigation, offering an easy-to-implement solution. The performance of laser spray irrigation system under lengths 20 m, 40 m and 60 m of rain hose pipe were analysed. The relationship between various lengths of rain pipes and their corresponding discharges, uniformity coefficient and throw distance were plotted. The decreasing pressure had a linear relationship with discharge. The results of the study ensure that the soil moisture content at higher pressure (at head reach of rain hose pipe) is more compared with lower pressure (at tail end of rain hose pipe) and could also found that water application rate was decreased with increasing rain pipe length. The top surface contains lower moisture content and it increased with depth. The water distribution was more uniform at 20 m rain hose pipe with higher pressure and the uniformity coefficient is approximately 97.8 and distribution efficiency of 97.10 % which is comparatively higher than 40 m and 60 m rain hose pipe. In case of multilateral system due to lesser spatial variation, the coefficient of uniformity is higher. But 20m rain hose pipe is not economical to use, so the response for radish crop at 40 m length rain hose pipe of 40 mm diameter with 4 m spacing was good at 0.75 kg cm-2 operating pressure and conclude that which is to be a highly effective water application method.

Keywords

Laser Spray, uniformity coefficient, Discharge rate, Distribution efficiency, Radish

Conclusion

Throw distance was found to be decreased with increasing rain pipe length which resulted in maximum distance of 4.14 m and 8.12 m away from the lateral for both 20 mm and 40 mm rain hose pipe. It observed that pressure loss was occurred along the rain pipe that resulted in decreased discharge rate at 60 m length of rain pipe. The discharge per unit length of the lateral was found to be decreased with increasing Rain pipe length. As the length of rain pipe increased coefficient of uniformity was found to be decreased. Uniformity coefficient is approximately 86 % at 60 m length. Overall, irrespective of rain hose pipe diameter the laser spray irrigation system performed well up to 40 m length hose rain pipe with uniformity coefficient of 93.29 and 94.81 %, distribution uniformity of 91 and 92.48 % and mean application rate of 8.31 and 10.1 cm hr-1 with operating pressure of 0.75 kg cm-² for 20mm and 40mm diameter rain hose pipes respectively, compared to 60 m length. The general trend considering the different parameters observed suggests that irrespective of diameter of ran pipe, 20 m length is not economical to use so 40 m length was found to be better to achieve higher yields and benefit from vegetable crops with 4m pipe spacing under 0.75 kg cm-2 operating pressure.

References

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How to cite this article

Kavita, Rajashekarappa K. S., Hanumanthappa, D. C. and Devappa (2023). Performance Evaluation of Laser Spray Irrigation System Under Variable Rain Hose Pipe Lengths. Biological Forum – An International Journal, 15(10): 322-327.