Browsing by Author "Ouma, Josephine P."

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African Journal of Agricultural Research Physiological response of soybean [Glycine max (L) Merrill] to soil moisture stress
(Egerton University, 2019-04) Ouma, Josephine P.; Kimutai, Erick
This study was done to determine the effects of varying soil moisture regimes on CO2 assimilation of soybean [Glycine max (L.) Merrill] in pots under greenhouse conditions during 2017 and 2018 cropping seasons. The experiment was conducted as a Randomized Complete Block Design (RCBD) in a 4 x 6 factorial treatment arrangement and replicated 3 times. Soil moisture regimes (80, 60, 40 and 20% of field capacity) and cultivars (Gazelle, Nyala, EAI 3600, DPSB 8, Hill and DPSB 19) were first and second factors, respectively. Collected data were subjected to Analysis of Variance (ANOVA) using Linear Mixed Model in GENSTAT. Significantly different treatment means were separated using Tukey’s test at 0.05 significance level. Leaf relative water content, stomata conductance, photosynthesis rate and substomatal CO2 concentrations significantly (P < 0.001) declined with increasing soil moisture stress. Total leaf chlorophyll content increased (P < 0.001) with increased soil moisture stress. Cultivars DPSB 19 and DPSB 8 had relatively higher leaf relative water content and stomata conductance at reduced soil moisture regime at 20% moisture from field capacity indicating moisture stress tolerance potential of the cultivars. Key words: Flowering stage, podding stage, seasons, soil moisture regimes, soybean
Effect of Integrated Chicken Manure and Inorganic Fertilizers on Growth and Yield of Hybrid Maize (Zea Mays. L.) in Malawi
(International Journal of Sciences: Basic and Applied Research (IJSBAR), 2015-11) Ouma, Josephine P.; Lelei, J.J.
Fertilizer application is necessary for optimal maize (Zea mays. L) yields in Malawi due to declining soil fertility. Use of inorganic fertilizer is expensive for smallholder farmers. The study was conducted to evaluate effect of integrated organic and inorganic fertilizer utilization on nitrogen uptake, growth and yield of hybrid maize in Malawi. Field experiments were carried out in Lilongwe and Zomba Districts during the 2016/17 growing season. A split plot layout in a randomized complete block design with 3 replicates was used. Maize varieties SC403 and SC627 were the main plots. The sub plots were six fertilizer treatments: (T1); 4 t ha-1 chicken manure (CM), (T2); CM and 22.5 kg N ha-1, (T3); CM and 45 kg N ha-1, (T4); CM and 67.5 kg N ha-1, (T5); CM and 90 kg N ha-1 and (T6); a no fertilizer input control. Urea fertilizer was the source of mineral N. Data on maize height, stem girth, biomass and grain yield was collected and subjected to analysis of variance (ANOVA) using SAS programme. Mean separation was done using Fishers LSD, at 95% probability level. The study indicated that organic manure and inorganic fertilizer integration significantly (P<0.05) affected maize growth and yield. The maximum maize height and girth were attained by use of CM and 22.5 kg N (T2) which is quarter of recommended fertilizer rate.
Growth, yield and phosphorus use efficiency of potato varieties propagated from apical rooted cuttings under variable phosphorus rates
(African Journal of Plant Science, 2021-06-09) Aarakit, Pauline; Ouma, Josephine P.; Lelei, Joyce J.
This study determined effect of phosphorus (P) rates on growth, yield and phosphorus use efficiency (PUE) of potato varieties propagated from apical rooted cuttings. Experiments were conducted at Egerton University, Njoro and Kenya Agricultural and Livestock Research organization, Molo, in a split plot arrangement in randomized complete block design with three replicates. Main plot factors were four potato varieties (Shangi, Dutch Robyjn, Unica and Wanjiku) and sub plot factors were four P levels of triple super phosphate (0, 30, 60, 90 kg P ha-1). Data on growth, yield and PUE of potato were collected. Phosphorus rates had significant effect on plant growth and yield. The interaction effects of P rates and varieties on plant survival, plant height, shoot biomass, number of eyes and tuber size was significant. The interaction of Wanjiku and 30 kg P ha-1 gave the highest shoot biomass of 0.42g per plant and large sized tubers (> 60 mm diameter). The main effects of variety and P rates significantly affected days to physiological maturity and marketable tuber yield. Unica variety showed high P uptake and PUE at both study sites. Apical rooted cuttings and 30 kg P ha-1 is recommended in the study areas with similar agro ecological zones.