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Characterization of soils, cultivation practices and productivity of rice (Oryza sativa L.) in upghat region of Uttar Kannada district

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Title Characterization of soils, cultivation practices and productivity of rice (Oryza sativa L.) in upghat region of Uttar Kannada district
 
Creator Ramesh.Nayak B.
 
Contributor K.Manjappa
 
Subject Agronomy
 
Description A study was conducted in upghat region of Uttara Kannada district of Karnataka State
with a view to characterize the rice ecosystem with respect to variation in soil nutrient
availability, cultivation practices and rice yield in different toposituations under low and high
rainfall regions. The sand content and bulk density of rice soils was higher in low lands. The
silt, clay and WHC were higher in midland toposituations. The pH and EC in these soils was
ranging from 5.01 to 5.11 and 0.79 to 0.82 dS/m, respectively. The organic carbon content
was medium to high in these soils (0.65–1.02%). The availability of N, P and K was low and
it was ranging from 149.4 to 162.3, 14.3 to 21.1 and 128.0 192.5 kg/ha, respectively. The
secondary nutrients like Ca, Mg and S content was ranging from 2.41 to 2.71, 0.82 to 1.21
meq/100g and 12.52 to 20.00 ppm, respectively. The data on micronutrient content of rice
soils indicates that the availability of Zn was higher in high rainfall region (1.98-2.12 ppm)
than in low rainfall region (1.73-1.88 ppm). On the contrary, availability of Mn was higher in
low rainfall region than in high rainfall region. The iron content in these soils was ranging
from 5.21 to 5.93 ppm. The enzyme activity viz., respiratory activity, dehydrogenase activity
and nitrification potential were highest in lowland toposituations. The rice grain and straw
yield was maximum in lowlands followed by midlands and uplands in both the rainfall
situations. The yield parameter viz., panicles/m2, panicle length, number of filled
grains/panicle, per cent grain filling, test weight etc., were also higher in lowlands. The
survey on documentation of existing cultivation practices of rice indicates that drill sowing
and transplanting methods are common in low and high rainfall regions, respectively. The
majority of farmers were using local varieties under drill sowing and improved varieties
under transplanting method. The result on seed rate, fertilizer management, fertilizer
application and organic manure application indicates that majority of farmers were using
below the recommended dose and it was also found that majority of the farmers were not
applying fertilizer properly. Weed problem was more in drill sown condition than in
transplanted condition. The yield level of drill sown rice was ranging from 15 to 30 q/ha in
different toposituations. Under transplanted situation, the yield level of rice was ranging
from 40–60 q/ha in different toposituations. In both the methods, the yield levels were higher
in lowlands followed by midlands compared to uplands.
 
Date 2016-10-28T13:19:54Z
2016-10-28T13:19:54Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/82712
 
Format application/pdf
 
Publisher UAS, Dharwad