Sokoine University of Agriculture

Upland rice growth and yield response to weed management practices under rainfed conditions

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dc.contributor.author Kolleh, David Sylvester
dc.date.accessioned 2017-05-03T10:28:53Z
dc.date.available 2017-05-03T10:28:53Z
dc.date.issued 2016
dc.identifier.uri https://www.suaire.sua.ac.tz/handle/123456789/1489
dc.description DISSERTATION SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CROP SCIENCE OF SOKOINE UNIVERSITY OF AGRICULTURE. MOROGORO, TANZANIA. 2016 en_US
dc.description.abstract Field experiments were conducted in two seasons at Sokoine University of Agriculture farm in Morogoro, Tanzania (6.850S; 37.640E and 568 m.a.s.l.) during the short rain (November 2014 to January 2015) and the long rain (March to June 2015). The experiment was a split plot in a randomized complete block design (RCBD) with 4 replications. Weed management practices (pre-emergence (ULTRA 2, 4-D), post-emergence (Hansunil), hoe weeding (3x) and weedy) were the main plot treatments and four rice genotypes (NERICA-1, NERICA-4, NERICA-7 and Mwangaza) were the subplots. Significant differences (P<0.05) were recorded for weed counts among weed management practices. The dominant weed group, as determined by the Summed Dominance Ratio (SDR), in both experiments was broadleaf species (50.8%) followed by sedges (25.2%) and grasses (24.0%). Post-emergence (8.6%) and hoe weeding (12.3%) significantly reduced weed dry biomass compared to pre-emergence (17.8%) and weedy (61.3%) in 2014/15 and 2015 experiments respectively. Significant differences (P<0.05) were recorded among the rice variables. Mwangaza and NERICA-1 were recorded with the tallest and shortest plant height (129.8cm and 39.1cm) respectively for weed management practices in both experiments. Mwangaza and NERICA-1 was recorded with the highest and lowest tiller (35.3/m2 and 7.5m2) respectively. Mwangaza and NERICA-7 was recorded with the lowest and highest LAI (2.5 and 4.5) and NERICA-7 showed the highest and lowest (1603g/m2 and 305.1g/m2) straw biomass in both experiments. Rice grain yield were highest for NERICA-1 in hoe weeded and plots applied with post-emergence herbicide (2187.5kg/ha and 1562.5kg/ha) > pre-emergence (965.9kg/ha) and weedy plots (0.0kg/ha) 2014/15 experiment and post-emergence and hoe weeded plots (4630.6kg/ha) and (4176.1kg/ha) > pre-emergence (3323.8kg/ha) and weedy plots (0.78kg/ha) 2015 experiment. The highest net return (3 352 846 Tshs) was obtained on NERICA-1 in post-emergence plots, this was also similar (P<0.05) to hoe weeding plots. Hansunil was also effective in weed control and had significant effect on profit analysis should be used in combination with hoe weeding under integrated weed management. en_US
dc.language.iso en en_US
dc.publisher Sokoine University of Agriculture en_US
dc.subject Upland rice growth en_US
dc.subject Yield response en_US
dc.subject Weed management practices en_US
dc.subject Rainfed conditions en_US
dc.subject Summed Dominance Ratio en_US
dc.title Upland rice growth and yield response to weed management practices under rainfed conditions en_US
dc.type Thesis en_US


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