Impact Factor (2025): 6.9
DOI Prefix: 10.47001/IRJIET
A pilot scale gravity-centre pivot
sprinkler irrigation system (GCPSIS) was designed, constructed and evaluated at
two operating speeds on an Okra field at the experimental field of the
Department of Agricultural and Environmental Engineering of Joseph Sarwuan Tarka
University Makurdi, Analysis of variance (ANOVA)at P(0.05)from the data sets
showed mean Soil Wetting Depth (SWD) ranging between 7.75±0.35 to
13.75±035cm/hr and 5.90±0.14 to 3.15±0.49cm/hr at speeds 5 and 7 rpm
respectively and were not significantly different both in speeds, orientation
and distances from the pivot station. The mean Soil Moisture Content (SMC) was
15.95 ±6.30 and 11.78 ±1.81% at 21-40cm depth at 5rpm and 7rpm respectively.
The average Soil Bulk Density (SBD) at 0-20, and 21-40cm soil depth
was1.23+0.5g/cm3 and 1.23±0.13g/cm3 respectively at 5rpm
indicating a higher variability. At 7rpm mean values were 1,31±0.06 and
1.28+0.06g/cm3 at 0-20, and 21-40cm soil depth respectively
indicating similar variability at both depths. Both speed and depth were not
significant with respect to the SBD but speed was significant for SMC.
Application Efficiency (Ea), Coefficient of Uniformity (CU), Distribution
Uniformity (DU) along the pivot lateral complied with acceptable standards and
were 77.67, 45.35 and 85.80 % respectively at 5rpm and 86.83, 44.89 and 94.03%
at 7rpm respectively. The and Nozzles Discharge (ND) was highest (9.12 L/min)
at the nozzle closest to the pivot station, high (9.00 L/min) at the middle
nozzle and low (8.94 L/min) at the nozzle at the end of the lateral line in the
first week and decreased slightly up to week five due to clogging.
Country : Nigeria
IRJIET, Volume 8, Issue 9, September 2024 pp. 245-258