STUDIES ON INTEGRATED NUTRIENT MANAGEMENT AND INTERCROPPING IN RICE (Oryza sativa L.) CULTIVARS UNDER AEROBIC CONDITION
Loading...
Date
2009-06-14
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Agricultural Sciences GKVK, Bangalore
Abstract
Experiments on “Studies on integrated nutrient management and intercropping
system in rice (Oryza sativa L.) cultivars under aerobic condition” were carried out
during Kharif 2006 and 2007 in farmer’s field at Marakadadoddi village, Maddur taluk,
Mandya district. Experiment – I was conducted to study the performance of rice cultivars
as influenced by integrated nutrient management practices under aerobic condition in
Cauvery command area and was laid out in a split plot design with three cultivars as
main plot i.e., (KRH-2, BR-2655 and IR-30864) and five integrated nutrient
management practices including both organic sources and inorganic sources and
replicated thrice. Among the different rice cultivars, KRH-2 recorded significantly higher
mean grain yield of rice (60.2 q ha-1) as compared to other rice cultivars like BR-2655
(55.5 q ha-) and IR-30864 (50.8 q ha-1). Higher grain yield of KRH-2 was due to
improved growth parameters and yield components. Among different combinations of
nutrient sources, N4 (50 per cent N through inorganic + 50 per cent N through
vermicompost) recorded significantly higher grain yield (63.1 q ha-1) over other
combinations. Whereas, lowest grain yield ha-1 was recorded with N1 (100 per cent RDF
(Recommended dose of fertilizer) (48.0 q ha-1).
From this experiment it is concluded that rice cultivar KRH-2 had performed well
under aerobic method of rice cultivation with application of 50 per cent N through
vermicompost and remaining 50 per cent N through inorganic fertilizers.
Second experiment was conducted to study the performance of aerobic rice as
influenced by intercrops and was laid out in randomized complete block design with
seven intercrops treatments i.e., french bean, bhendi, radish, amaranthus, soybean,
coriander and as sole crop of rice which are replicated thrice. Sole rice crop recorded
significantly higher grain yield (5470 kg ha-1) compared to rice yields in different
intercropping systems. But it was on par with rice yields in rice + amaranthus (5085 kg
ha-1). Bhendi suppressed the rice yields to a maximum extent of 31.8 per cent. While,
amaranthus records least suppression to the tune of 7.11 per cent. Intercropping
amaranthus was helpful in reducing the monocot, dicot and total weed dry weight (1.57,
1.58 and 2.05 g m-2, respectively) and thereby helped to increase the rice yield as
compared to other intercrops. Intercropping coriander was also useful in similar way.
Rice + amaranthus recorded significantly higher rice equivalent yield (18,007 kg ha-1)
compared to sole crop of rice (5,470 kg ha-1) and rice + french bean (4,716 kg ha-1).
However, it was statistically on par with rice + coriander (17,926 kg ha-1). This indicates
that amaranthus and coriander were more compatible with rice as intercrop.
The rice + radish recorded highest (Rs. 20,475 ha-1) cost of cultivation. Rice +
amaranthus recorded significantly higher gross returns (Rs.10,3382 ha-1), net returns (Rs.
84,107 ha-1) and B: C ratio (1:5.36) as compared to the other intercrops. It was
statistically on par with rice + coriander which recorded gross returns (Rs. 10,2678 ha-1),
net returns (Rs 82,943 ha-1) and B:C ratio (1:5.20). The lowest gross returns, net returns
and B: C ratio were recorded with rice + french bean (Rs 29,949 and Rs.10,024 ha-1 and
1:1.50, respectively).
From this experiment it is concluded that rice + amaranthus and rice + coriander
performed well under aerobic method of rice cultivation.
Description
Keywords
null