DESIGN OF MICROSPRINKLER SYSTEM BASED ON NON-UNIFORMITY IN SPRINKLING
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Date
1993
Authors
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The laboratory studies on microsprinkler were under
taken in the year 1992-93 to study the discharge, moisture
distribution pattern, non-uniformity in sprinkling, wetted
diameter and an average depth of precipitation as influenced by
operating pressures for a fixed stake height of 30 cm. An
attempt was also made to study the resultant wetting pattern in
respect of non-uniformity, average depth of precipitation, cost
of system for various microsprinkler spacings.
A non-uniform distribution of water affects the yield
of crop. The data generated at All India Co-ordinated Research
Project on Water Management, Mahatma Phule Krishi Vidyapeeth,
Rahuri on yield of watermelon as influenced by depth of
irrigation water applied was used to develop the yield
function. An effect of non-uniformity in sprinkling on yield of
watermelon was studied for the resultant wetting patterns
obtained for various spacings and operating pressures. The
optimal microsprinkler spacings were worked nut. An attempt
has also been made to provide graphical solution by which for
any given operating pressure, the values of optimal spacing,
the cost of system, the yield and coefficient of variation can
directly be read.
The wetting patterns of microsprinklers for all
operating pressures showed a triangular shape. An increase in
operating pressure (P) resulted in a corresponding increase in
discharge (Q) of microsprinkler. The discharge was in the
range of 24 to 34.2 lph for operating pressure in the range of
9
1.2 to 1.8 kg/cm . An increase in operating presssure
decreased the average depth of precipitation upto 1.6 kg/cm
operating pressure and further increase in operating pressure
increased the average depth of precipitation. An average depth
of precipitation was found in the range of 4.23 to 5.74 mm.
And increase in operating pressure from 1.2 to 1.8 kg/cm"
increased the wetted throw from 4.68 to 5.77 m. and the
coefficient of uniformity from 40.7 to 60.9 per cent
respectively.
The resultant wetting pattern obtained by overlapping
the wetting pattern for microsprinkler spacings in the range
of lx In to 2,5 x 2,5 n indicated that the lower spacing and
lower operating pressure of microsprinkler minimized the variation and thus the more uniform depth of precipitation.
For the same operating pressure, the increase in
microsprinkler spacing reduced the average depth of
preciptation. The coefficient of uniformity and coefficient of
variation values were observed in the range of 57.42 to 95.17
dper cent and 0.06 to 0.49 respectively, for the range of
operating pressure and microsprinkler spacing under study.
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