CSSRI Annual Report 2010-11 - Central Soil Salinity Research ...

Management of water logging/saline soils CSSRI Annual Report 2010-11
Fig. 18: Effect of Thickness of sand bed on removal efficiency for different particle size of filtering media
Fig.19 : Effect of particle size of coarse sand (CS) and sediment load on filtration rate
Performance Study of Subsurface Microirrigation
for Horticultural Crops (fruits) using
Domestic Wastewater (R.S. Pandey, Lalita
Batra, S.K. Gupta and Ali Qadar)
The research work on use of sewage water
with drip irrigation for fruit crops, initiated in
2006, was continued. The study was carried out
with two treatments i.e. drip irrigation with
(i) sewage water and (ii) good quality water.
Three fruit crops are being cultivated i.e. aonla
and guava as main fruit crops with inter crop
papaya. The pressure compensating drippers
were installed at 40 cm depth having discharge
rate of 4 L h -1 and four emitters were provided
for each guava and aonla plant. During the
year, the study was conducted on three basic
aspects. i.e. back pressure, clogging of emitters
and plant performance. In the back pressure
study, the emphasis was given on the effect of
backpressure on emitter performance and their
selection criteria. During backpressure, there
is a reduction in net pressure due to pressure
generated by the soil media. The manufacturing
coefficients of variation of the emitters, which
was non-pressure compensating and utilized
during vegetable production during 2003-06,
were analyzed for this purpose (Table 25). Data
revealed that these emitters are better suited for
the backpressure as manufacturing coefficient
of variation increased with the applied pressure.
Here, the nominal discharge rate pressure was
1.0 kg cm - ² and manufacturing coefficient of
variation was less at 0.60 kg cm - ² pressure having
value of 0.0514 compared to higher pressure i.e.
1.5 kg cm - ², having the value of 0.0928 above the
nominal discharge rate pressure.
In fruit crops, plant spacing is wide, which
require clubbing of the emitters to increase the
discharge rate. In the present case, the plant-to-
46