Effect of brown manuring and different levels of nutrients on the performance of aerobic rice (Oryza sativa. L)

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dc.contributor.advisorChaudhary, S.K.
dc.contributor.authorM, Poornima Reddy
dc.date.accessioned2020-12-03T05:30:15Z
dc.date.available2020-12-03T05:30:15Z
dc.date.issued2020
dc.description.abstractThe field experiment entitled “Effect of brown manuring and different levels of nutrients on the performance of aerobic rice (Oryza sativa L.)” was conducted on sandy loam soil at the experimental farm of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar during kharif season, 2019. The soil of the experiment site was found to be calcareous in nature, sandy loam in texture and alkaline in reaction with a pH of 8.3. It was deficient in organic carbon (0.45%), available nitrogen (243 kg N/ha), available phosphorous (11 kg/ha) and potassium (112 kg/ha). This experiment was conducted in randomized block design (factorial) with sixteen treatment combinations replicated thrice using the rice variety “Abhishek” as a test crop. The two factors under study comprised of (A) System of cultivation: B1 – Rice alone, B2 – Rice + Dhaincha (Brown manuring @ 40 kg/ha which is knocked down at 25 DAS using a post-emergence herbicide) and (B) Different levels of nutrients: F1- 60 kg/ha phosphorous and 40 kg/ha potassium as basal, F2- 60 kg/ha phosphorous and 50 kg/ha potassium as basal, F3- 60 kg/ha phosphorous and 40 kg/ha potassium as split, F4- 60 kg/ha phosphorous and 50 kg/ha potassium as split, F5- 70 kg/ha phosphorous and 40 kg/ha potassium as basal, F6- 70 kg/ha phosphorous and 50 kg/ha potassium as basal, F7- 70 kg/ha phosphorous and 40 kg/ha potassium as split, F8- 70 kg/ha phosphorous and 50 kg/ha potassium as split. Standard package and practices of crop management were followed during the experiment. Complete dose of phosphorous was applied as basal application whereas urea (RDN-140 kg/ha) was applied in three split doses as basal (50%), active tillering (25%) and panicle initiation (25%) and potassium was applied in two split doses (60% as basal and 40% at panicle initiation stage). The results obtained from the experiment revealed that brown manuring and different levels of phosphorous and potassium had a prominent influence on growth parameters, yield attributes, yield, nutrient uptake and economics of aerobic rice. Higher values of growth parameters (Plant height, tillers/m2, dry matter production and crop growth rate) were observed in rice without dhaincha at 25 DAS since rice + brown manuring treatments witnessed higher biological pressure and competition exerted by dhaincha as well as the shading effect of its canopy. As a result, treatment B1 produced higher growth indices initially which were anyways non-significant. However, at the later stages, treatment B2 recorded significantly maximum values of all the growth parameters except plant height(cm). Most of the yield attributes (panicles/m2 and grains/panicle), yield (grain and straw), OC (%) and available N in soil, N, P and K uptake by both grain and straw were significantly higher with inclusion of dhaincha in rice in treatment B2. It was also found to be the most profitable treatment with regards to gross returns, net returns and B:C ratio. While amongst the nutrient levels, treatment F8- 70 kg/ha phosphorous and 50 kg/ha potassium as split recorded significantly higher growth parameters ( tillers/m2 , dry matter production and crop growth rate), yield attributes (panicles/m2 , grains/panicle), yield (grain and straw), N, P and K uptake (grain and straw) and economic returns (gross returns, net returns and B: C ratio) while remaining at par with treatment F4 -60 kg/ha phosphorous and 50 kg/ha potassium as split. Plant height, panicle length, test weight and harvest index remained unaffected by any of these treatments. However, the interaction effect of both the factors did not significantly influence any of the parameters. Thus, from this experimentation it can be inferred that brown manuring and application of 140kg N, 60kg P2O5 and 50kg K2O as split provided beneficial results for aerobic rice cultivation and for the recommendation to farmers.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810156167
dc.keywordsAgronomy, Soil Science, Brown, Aerobic rice, (Oryza sativa. L)en_US
dc.language.isoEnglishen_US
dc.pages86 p. xix (Bibliography and Appendices)en_US
dc.publisherDRPCAU, Pusaen_US
dc.subAgronomyen_US
dc.themeEffect of brown manuring and different levels of nutrients on the performance of aerobic rice (Oryza sativa. L)en_US
dc.these.typeM.Scen_US
dc.titleEffect of brown manuring and different levels of nutrients on the performance of aerobic rice (Oryza sativa. L)en_US
dc.typeThesisen_US
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