Effect of irrigation and mechanical weeding on growth, yield and quality of rice under system of rice intensification.
| dc.contributor.advisor | Kumar, Vinod | |
| dc.contributor.author | Kumar, Rajan | |
| dc.date.accessioned | 2016-09-15T10:49:23Z | |
| dc.date.available | 2016-09-15T10:49:23Z | |
| dc.date.issued | 2012 | |
| dc.description.abstract | A field experiment was carried out during Kharif season of 2008 and 2010 in Split Plot Design with three replications at Rajendra Agricultural University Farm, Pusa, Bihar to find out the “Effect of irrigation and mechanical weeding on growth, yield and quality of rice under system of rice intensification”with four irrigation levels consisting of continuous submergence to 2.5 cm, submergence to 2.5 cm 1 DAD, 3 DAD and 5 DAD of ponded water and three levels of mechanical weeding i.e. rotary weeding at 20 and 40 DAT, rotary weeding at 20, 30 and 40 DAT and rotary weeding at 10, 20, 30 and 40 DAT . The test variety was Proagro (Arize)-6444 of medium duration maturity. The soil of the experimental plot was sandy loam in texture, low in available N, P and medium in K with pH of 8.2. Results of two year experiment revealed that growth and yield attributes like plant height, number of tillers/hill, leaf area index, plant dry weight, crop growth rate, root volume, root dry weight, number of panicles/m2, number of spikelets/panicle, number of grains/panicle, length of panicle, grain weight/panicle, grain and straw yields, total NPK-uptake and gross return were found to be maximum under the treatment continuous submergence to 2.5 cm and were found significantly superior over submergence to 2.5 cm 5 DAD but were at par with 1 DAD and 3 DAD. Relative growth rate, 1000 grain weight, grain : straw ratio, harvest index, NPK content in grain and straw, crudeprotein content in grain and final soil fertility status of soil were not influenced by irrigation levels. Water use efficiency, water productivity, weed population and dry weight of weed were affected significantly due to different level of irrigation. The minimum water use efficiency, water productivity weed population and weed dry weight were observed with irrigation level ofcontinuous submergence to 2.5 cm. The values of these traits were increased with decrease in number of irrigation. Net return was not affected significantly due to different levels of irrigation in either of the years. However, maximum net return was obtained with submergence to 2.5 cm 3 DAD followed by 1 DAD, continuous submergence and submergence to 2.5 cm 5 DAD. Net return per rupee of investment was significantly influenced by irrigation levels. The maximum net return per rupee of investment was fetched with submergence to 2.5 cm which was significantly superior to continuous submergence to 2.5 cm 5 DAD and submergence to 2.5 cm 1 DAD but was statistically at par with submergence to 2.5 cm 3 DAD. Growth and yield attributes like plant height, number of tillers/hill, leaf area index, plant dry weight, crop growth rate, root volume, root dry weight number of panicles/m2, number of spikelets/panicle, number of grains/panicle, length of panicle, grain weight/panicle, grain and straw yields, total NPK-uptake, gross and net return were found maximum with the rotary weeding at 10, 20, 30 and 40 DATwhich in turn were significantly superior overrotary weeding at 20 and 40 DATbut statistically were at par with rotary weeding at 20, 30 and 40 DAT. Relative growth rate, 1000 grain weight, grain straw ratio, harvest index, NPK content in grain and straw, crude protein content in grain and final soil fertility status of soil were not affected significantly due to mechanical weeding treatments. Water use efficiency, water productivity, weed population and weed dry weight were significantly influenced by different levels of mechanical weeding during both the years of experimentation. The maximum water use efficiency and water productivity were recorded with four rotary weedings at 10, 20, 30 and 40 DAT which was significantly superior over two rotary weedings at 20, and 40 DAT but was statistically at par with three rotary weedings at 20, 30 and 40 DAT. The minimum weed population and weed dry weight were observed with four rotary weedings at 10, 20, 30 and 40 DAT. These were increased with decrease in number of rotary weeding. Net return per rupee of investment was not influenced by mechanical weeding. The maximum net return per rupee of investment was recorded with four rotary weedings at 10, 20, 30 and 40 DAT which was closely followed by three rotary weedings at 20, 30 and 40 DAT and the minimum net return per rupee of investment was recorded with two rotary weedings at 20 and 40 DAT. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/76811 | |
| dc.language.iso | en | en_US |
| dc.publisher | Rajendra Agricultural University | en_US |
| dc.sub | Agronomy | |
| dc.subject | Rice | en_US |
| dc.subject | Irrigation | en_US |
| dc.subject | Weed control, Mechanical | en_US |
| dc.these.type | Ph.D | |
| dc.title | Effect of irrigation and mechanical weeding on growth, yield and quality of rice under system of rice intensification. | en_US |
| dc.type | Thesis | en_US |