STANDARDIZATION OF PRECISION IRRIGATION MANAGEMENT TECHNIQUES FOR BABY CORN-CAPSICUM SEQUENCE UNDER POLYHOUSE CONDITION
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Date
2015-09-23
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
A field experiment entitled “Precision irrigation management techniques for baby
corn-capsicum sequence under polyhouse condition” was conducted at Zonal
Agricultural Research Station, University of Agricultural Sciences, Bengaluru in kharif
and rabi seasons during 2013-14 and 2014-15 in polyhouse and open field conditions.
The experiment was laid out in split-plot design and replicated thrice with irrigation
methods of surface and subsurface drip irrigation under polyhouse and open field
condition as main plots and scheduling of irrigation based on Epan ratios at 0.6, 0.8 and
1.0 as sub plots. Climatic parameters recorded at the experimental site indicated that
temperature (38-42 oC) and relative humidity (61-75 %) regimes were higher inside the
polyhouse as compared to open field (28-32 oC and 58-65 %, respectively). Among the
main treatments, subsurface drip fertigation in open field condition recorded higher cob
yield in baby corn (12.28 t ha-1) and water use efficiency (WUE) (47.03 kg ha-mm-1).
Whereas, quality parameters were slightly higher under polyhouse condition. In
capsicum, the fruit yield (124.03 t ha-1) and WUE (144.90 kg ha-mm-1) were significantly
higher in subsurface drip fertigation under polyhouse condition than in other treatments.
In polyhouse with congenial environmental condition, growth of capsicum (C3 plant) was
better than under open field. But in baby corn (C4 plant) lanky growth was observed due
to reduction in light. Among irrigation levels, gravimetric soil moisture and relative water
contents were significantly higher at 1.0 Epan. Canopy temperature recorded was lower
at 1.0 Epan that resulted in significantly higher green cob (11.25 t ha-1), fodder yield
(57.18 t ha-1) and capsicum fruit yield (100.24 t ha-1). The WUE was higher at 0.6 Epan
in baby corn (46.20 kg ha-mm-1) and capsicum (139.30 kg ha-mm-1). Higher B:C ratio for
baby corn-capsicum sequence was recorded in subsurface drip at 1.0 Epan under
polyhouse (13.29).
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