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WATER AND NITRATE DYNAMICS UNDER DRIP FERTIGATED CABBAGE

KrishiKosh

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Title WATER AND NITRATE DYNAMICS UNDER DRIP FERTIGATED CABBAGE
 
Creator RAJURKAR GAJANAN BABASAHEB
 
Contributor Neelam Patel
 
Description T-8460
India is one of the largest producers of cabbage (Brassica oleracea L.capitata) which is widely
planted during winter season. Nitrogen is one of the main macro nutrient require for the vegetables
production. Nitrate form of nitrogen is mainly available for plant growth. So to increase the vegetable
production, nitrogenous fertilizers are applied in large quantity which may lead to environmental
degradation. A proper design and management of a drip irrigation and fertigation system is, dependent
upon the understanding of water and nutrient distribution through the soil. An experiment was carried
out during October to March 2010-11 at PFDC, Water Technology Centre, Indian Agricultural Research
Institute, New Delhi to study the system performance, soil water and nitrate distribution and effect of
irrigation levels and fertigation frequency on yield and growth of cabbage crop. The experiment
included three levels of irrigation (100, 80 and 60% of crop evapotranspiration) and three fertigation
frequencies (biweekly, weekly and fortnightly). Drip irrigation system consisted with Pressure
compensating drippers (PC) and Non-pressure compensating drippers (NPC). Under NPC system soil
water content was found higher at different depth of soil at irrigation level of 60 % of ETc, while the soil
water content was found to be higher at irrigation level of 100 % of ETc under PC system which
indicates higher surface water losses under NPC system. NO3-N was observed in all soil layers (0.0-15.0
cm, 15.0-30.0 cm, 30.0-45.0 cm and 45.0-60.0 cm) for all three-fertigation frequencies i.e. biweekly,
weekly and fortnightly. NO3-N concentration was found more (22.4 mg Kg-1
of soil) in the soil depth
0.0-15.0 cm in the treatment with fortnightly fertigation frequency at the end of mid-season stage. At the
end of harvesting stage maximum NO3-N concentration was found at 15.0-30.0 cm and 30.0-45.0 cm
soil depth in fortnightly fertigation.The yield was higher in case of PC system as compared to yield in
NPC system. The maximum and minimum yields obtained in the plot with pressure compensating
drippers were 91.19 t ha-1
and 56.67 t ha-1 whereas in the plot with non pressure compensating drippers
were 73.33 t ha-1
and 43.7 t ha-1
. Biweekly and weekly fertigation frequency showed no significant
difference in yield of cabbage, both in PC and NPC systems. There was no significant difference in
yield between treatment with irrigation levels of 100 and 80% of ETc when tested statistically. The
highest yield was recorded in weekly fertigation (91.19 t ha-1
) followed by bi-weekly fertigation (90.37 t
ha-1
) under pressure compensating drippers, whereas the highest yield was recorded in biweekly
fertigation (73.33 t ha-1
) followed by weekly fertigation (61.48 t ha-1
) under non-pressure compensating
drippers. But statistically it was found that there was no significant difference in the yield of weekly and
biweekly fertigation. So it is concluded that irrigation levels of 80% of ETc was best irrigation level
which saves the water without compromising the yield and weekly fertigation frequency was best
frequency which saves the time in fertigation of field without compromising the yield.
 
Date 2016-11-23T09:16:29Z
2016-11-23T09:16:29Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/87153
 
Format application/pdf
 
Publisher IARI, DIVISION OF AGRICULTURAL ENGINEERING