TECHNO-ECONOMIC EVALUATION OF SOLAR PUMP USING SURFACE AND SUBSURFACE DRIP FERTIGATION IN BRINJAL (Solanum melongena L.) CROP
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Date
2020-10
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Journal ISSN
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Publisher
JAU,JUANAGDH
Abstract
A field experiment was conducted to study the techno-economic evaluation of
solar pump using surface and subsurface drip fertigation in brinjal (Solanum
Melongena L.) crop during November 2019 to April 2020. The solar photovoltaic
pumping system was having solar panel area of 28.8 sqm, power capacity of 4.8 kw
and 3.73 kw AC submersible pump. The brinjal crop response to surface and
subsurface drip irrigation having fertigation level of 60%, 80% and 100% RDF were
assessed and compared with that of with farmers practices. The brinjal crop was
transplanted at 0.6 r/r x 1.2 pr/pr x 0.6 m p/p spacing. The drip system were having
inline lateral of 4 lph dripper at 0.6 m spacing. The each lateral was kept at 1.8 m
spacing, each one served a pair of rows. The irrigation was scheduled at IW/ETc of
1.0.
The maximum of monthly average WHP was produced as 2.20 hp at 01:00 pm
in April. Total input radiation was found varying from 378 W/m2
to 828 W/m2
during
a day time of 9 am to 5 pm. During the same interval, the discharge of solar pump was
found from 2.49 lps to 4.75 lps. The panel efficiency of the 4.8 kw solar photovoltaic
system was found varying from 10.19% to 17.95% while the system efficiency was
found in the range of 3.69% to 7.78%. Approximate area of 1.32 ha brinjal crop can
be cultivated under drip irrigation using solar photovoltaic pumping system (4.8 kw
having 28.8 sqm solar panel & 3.73 kw pump) with drip irrigation. The maximum
yield of brinjal was found to be 37940 kg/ha under subsurface drip irrigation with
80% RDF, while in surface drip irrigation it was found 33558 kg/ha with 100% RDF.
There was a saving in 29.53% irrigation water and 20% fertilizer through irrigation
and fertigation by sub surface drip system as compared to farmer’s practice. The
maximum benefit cost ratio of 9.07 was found under subsurface drip irrigation with
80% RDF