Browsing by Author "Momolu, Emmanuel P."

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    Effect of Soil Moisture Stress Duration on the Growth Characteristics and Yield of Rice Cultivars
    (Journal of Agriculture and Environmental Sciences, 2016) Momolu, Emmanuel P.; Katuromunda, Sylvester; Lamo, Jimmy
    Soil moisture stress is a major constraint to the productivity of rice under rain-fed conditions. A study was conducted to establish the effect of moisture stress duration on the growth characteristics and grain yields of rice cultivars, namely Namche-1, Namche-3 and Agoro. Rice plants were subjected to moisture stress at tillering and a thesis in the screen house. Moisture stress at tillering stage caused significant leaf rolling in Agoro than in Namche-3, but at a thesis Agoro was the least (P≤0.05) affected. Moisture stress at tillering and a thesis significantly reduced the number of tillers in Agoro, but not in Namche cultivars. The growth period of Agoro was significantly longer than that of the control when it was stressed at tillering for 15 days, but stressing Agoro at a thesis didn’t affect its maturity period. Stressing Namche cultivars at tillering and a thesis increased (P≤0.05) their maturity periods, though these periods were shorter (P≤0.05) than that of Agoro. Grain yields for all the cultivars at tillering and a thesis decreased as the stress period was prolonged. Grain yields of Namche cultivars were higher (P≤0.05) than that of Agoro. Therefore, the growing of Namche cultivars in areas with insufficient moisture for rice production would be appropriate.
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    Soil Moisture Stress and Nitrogen Supply Affect the Growth Characteristics and Yield of Upland Rice Cultivars
    (International Journal of Plant & Soil Science, 2017) Momolu, Emmanuel P.; Lamo, Jimmy; Katuromunda, Sylvester
    To assess the effect of soil moisture stress and nitrogen fertilizer application on the growth characteristics and yield of upland rice cultivars. Study Design: Completely randomized design in a factorial arrangement. Place and Duration of Study: National Crops Resources Research Institute, Namulonge, Uganda between March and July 2015. Methodology: The experiment comprised four nitrogen (N) application levels (0 as control, 40, 80 and 120 kg N/ha) as main plots and four soil moisture levels (25% as control, 15, 10 and 5%) as sub-plots. Results: Plant heights for stressful moisture levels (15, 10 and 5%) at all N levels were lower (P < .001) than those of the control treatments at the respective N levels. Also, rice plants under stressful treatments at each N level took longer (P < .001) to mature when compared with the control treatments at the respective N levels. Subjecting rice plants that were supplied with 0 kg N/ha to moisture stress did not significantly (P > .05) affect the number of panicles produced when compared with the control. Under the 40 kg N/ha level, number of panicles produced by rice plants subjected to 15 and 10% moisture stress levels (3.56 and 4.00) were significantly lower than those of the control (6.00). For the 80 and 120 kg N/ha levels, number of panicles decreased significantly at all moisture stress levels when compared with the respective control treatments. Subjecting rice plants to moisture stress at the 40, 80 and 120 kg N/ha levels significantly (P < .001) reduced the grain yield when compared with the respective control treatments. Conclusion: Namche-3 rice cultivar performed optimally when subjected to 15% moisture stress and 120 kg N/ha application rate. Thus, farmers growing Namche-3 rice in areas with limited soil moisture may apply N at 120 kg/ha if they are to realize better grain yields.