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|Title:||Characterization of soils, cultivation practices and productivity of rice (Oryza sativa L.) in upghat region of Uttar Kannada district|
|Abstract:||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.|
|Theme:||Characterization of soils, cultivation practices and productivity of rice (Oryza sativa L.) in upghat region of Uttar Kannada district|
|Research Problem:||Characterization of soils, cultivation practices and productivity of rice (Oryza sativa L.) in upghat region of Uttar Kannada district|
|Appears in Collections:||Thesis|
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