CONJUGATE ASSESSMENT OF DRIP SYSTEM CONFIGURATION AND IRRIGATION REGIMES ON PRODUCTIVITY OF CUMIN 1813
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Date
2013-12
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JAU, JUNAGADH
Abstract
A field experiment was undertaken during the year 2011-12 and 2012-13 to
analyze the conjugate assessment of drip system configuration and irrigation regimes
on productivity of cumin.
Three irrigation level mainly 0.6 IW/ETc (lo), 0.8 IW/ETc (Ii) and 1.0 IW/ETc
(I2), three lateral spacing i.e. 60 cm (Si), 70 cm (82) and 80 cm (S3) and two and two
emitter geometries mainly hexagonal(Gi) and triangular (G2) were analyzed in the
present study. Split-Split design was adopted with eighteen treatment combinations.
Each treatment was duplicated thrice. Irrigation regimes, lateral spacing and emitter
geometry were taken as first, second and third factors respectively. The effect of these
factors were analyzed on plant height at harvesting time, seed yield, dry matter, oil
content and water use efficiency. Economics of each configuration and irrigation
regimes was also calculated.
Irrigation with 0.8 IW/ETc resulted higher yield of 1255.78 kg/ha. More
application of water could not increase the yield of cumin and considered the wastage
of water. So in case of cumin 0.8 IW/ETc is considered ideal and economic. Higher
plant height at harvesting, seed yield per hectare, dry matter produced per hectare and
oil content have been observed in irrigating with 0.8 IW/ETc than 0.6 and 1.0
IW/ETc.
System configurations significantly affected in cumin crop. Increase in lateral
spacing decrease the yield attribute for all irrigation regimes and emitter geometry. So
60 cm lateral spacing found better than 70 cm and 80 cm lateral spacing.
Triangular emitter geometry configurations system found to be better than
hexagonal geometry for attaining sound morphological parameters and yield attributes
for all irrigation regimes and lateral spacing. More uniform water distribution was
observed between two laterals in triangular geometry. Triangular emitter
configuration is better suited in closed growing field crops because of low unwetted
area per square meter and less cost compared to the hexagonal emitter pattern
geometry.
Higher water use efficiency of 5.60 kg/ha.mm was observed in 0.6 IW/ETc
with triangular geometry and 60 cm lateral spacing. Highest gross income of Rs.
156108.7 /ha, net income of Rs. 90894.7 /ha and benefit; cost ratio of 2.39 were
found in irrigation application at 0.8 IW/ETc with triangular emitter geometry and 60
cm lateral spacing.
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SOIL AND WATER ENGINEERING