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- ItemCLASSIFICATION AND SUITABILITY EVALUATION OF SOILS OF A TOPOSEQUENCE AT ODEDA, OGUN STATE FOR THE PRODUCTION OF RICE (Oryza sativa)(Nigerian Journal of Soil Science, 2011-08-29) Ajiboye, G.A.; Alabi, K.O; Aiboni, V.U; Okeleye, K.A.; Adesodun, J.A.A detailed survey of the soils of a Toposequence at Odeda, Ogun state was conducted to characterize, classify and assess the suitability of the soils for sustainable production of rice. The rigid grid method of survey was adopted for soil mapping while the linear parametric and square root models were used for assessing the suitability of the land for rice production. The result of the study showed that the soils of the three pedons were loamy sand to sandy clay loam texture, fine to coarse sub-angular blocky structure and loose to hard consistency. All the pedons had redoximorphic properties with varying quantities of iron-manganese concretion in the sub soils. Soil reaction ranged from strongly acid to neutral (pH of 5.3 – 6.8) with low organic carbon (<1.6%) and available nitrogen. Apart from Potassium contents which, were considered adequate for rice production, other exchangeable cations, available phosphorus and micro-nutrients were very low. Pedon 1 (upper slope) was classified as Typic Hapludalf (Lixisol; Cutanic, Hypereutric), Pedon 2 (Middle slope) as Aeric Endoaquept (Cambisol; Endogleyic, Hypereutric). All the pedons had index of current productivity (IPc) ranging between 1.13 and 5.32 and were currently not suitable (N2) for both upland and lowland rice production as assessed by the linear and square root models. Potentially, using the linear model, the index of potential productivity (IPp) ranged between 37.8 and 76.50 for upland rice production and between 44.10 and 54.00 for lowland production. Thus, Pedon 1 is highly suitable for upland rice but moderately suitable for lowland rice production. Pedon 2 is moderately suitable (S2) for the production of upland rice but marginally suitable(S3) for lowland rice production. Pedon 3 is potentially marginally suitable (S3) for both upland and lowland rice by the linear model. The square root model gave higher values of IPp ranging between 47.62 and 80.60 with a trend similar to the result of the linear model for upland rice production. However, the suare root model with an IPp ranging between 50.91 and 67.44 indicated that all the pedons are moderately suitable (S2) for lowland rice production. The limiting factors were mainly low levels of available macro and micro nutrients, low organic matter content and low cation exchange capacity.
- ItemAGRONOMIC EVALUATION OF THE SOILS OF A TOPOSEQUENCE FOR RICE (Oryza sativa L.) PRODUCTION IN ODEDA LGA, OGUN STATE.(Nigerian Journal of Soil and Tillage Research-Published by International Soil Tillage Research Organization, Nigeria Branch (ISTRO-NG), 2018-05-21) Alabi, K.O; Ajiboye, G.A.; Okeleye, K.A.; Aiboni, V.U.A suitability evaluation of some soil used for rice production in Odeda LGA of Ogun State was carried out. The result indicated that the identified soil types were currently marginally or unsuitable (N1) for rice production because the index of current productivity IPc that ranged between 1.13 and 5.32. However, the result further indicated that, with improved agronomic and soil management technique, the suitability of these soil can be improved to S1 or S2 (highly suitable/moderately suitable). This experiment was carried out to determine the level of agronomic and soil improvement that will result in acceptable yield of rice on these soils. A 2*2*2 factorial trial was used to evaluate the performance of rice under different management and fertilizer regimes within each mapping unit for two seasons. The factors considered were two rice varieties (Ofada and NERICAI); two types of fertilizers (NPK 20:10:10 at 400kg/ha and cured poultry manure at 10t/ha) and two different management methods (traditional and improved agronomic methods). The performance of the rice varieties did not differ across the land suitability units but was significantly affected by management practices (P= 0.05). Fertilizer application of both mineral and organic fertilizers (P<0.001) significantly improved the growth and yield of rice with organic fertilizer having higher effects. In conclusion, the productive capacity of soil for rice production can be improved through the use of both organic and inorganic fertilizers
- ItemUnderstanding the Nexus of Genotype, Root Nodulation, and Soil Nutrients for Shoot Biomass Production and Seed Yield in Cowpea (Vigna unguiculata L. Walp)(2023) Olawale Mashood Aliyu; Toyeeb Abayomi Abioye; Yusuf Folorunsho Abdulkareem; Abdulqudus IbrahimTo enhance the productivity of cowpea for seeds and shoot biomass yields, the complex interwoven relationships of genotype, soil nutrients, and nodulation were studied. A 4-year field study was conducted with ten cowpea accessions in a randomized complete block design of three replicates and data collected on soil parameters, root nodulation, plant growth, and yield characters were analyzed for variance components and correlation analysis. Genotype and year influenced the rate of nodulation, plant nutrient uptake, shoot biomass, and seed yield. Nodulation and nitrogen uptake increased shoot biomass production but not seed yield. Early maturity was associated with high seed yield, while late maturity enhanced biomass production. Cowpeas differ significantly in nodulation efficiency and soil nutrient utilization for seed yield and biomass production, with IT98K-205–8 being the most efficient. Soils cultivated for cowpea showed reduction in clay content and soil nutrients, but increased in silt content, soil acidity, and phosphorus uptake. Proportion of phosphorus uptake was significantly higher than nitrogen and organic carbon uptakes in cowpea. Increasing uptake of nitrogen and organic carbon is inversely associated to nodulation, growth parameters, and shoot biomass, while phosphorus uptake is directly correlated with seed yield. IT89KD-288 and IT00K-1263 were superior for nodulation and shoot biomass production (> 28 tons ha−1), while IT08K 150–12 and IT00K-1263 were best for seed yield of > 2.0 tons ha−1. This study reported the efficiency of root nodulation of native rhizobia and nutrient utilization as among the important elements required for optimum development and yield of cowpea. IT00K-1263 that combines high biomass with seed yield is a candidate for dual-purpose, while IT08K-150–12 could be useful as an early-maturing high-yield variety. Inherent nutrient utilization efficiency of IT98K-205–8 could be explored in future improvement programs.
- ItemVariance components, correlation and path analyses in cowpea (Vigna unguiculata L., Walp)(2021) Olawale Mashood Aliyu; Adeyemi Odunola Tiamiyu; Muinat Usman; Yusuf Folorunsho AbdulkareemCowpea as a low-input crop has a potential to significantly ameliorate poor nutrition and food insecurity in sub-Sahara Africa if problem of poor seed yield is addressed. Adequate information on the relationship between yield components and seed yield is, however, crucial for the development of better-quality varieties to improve farmers’ field yield. To this end, twelve cowpea accessions of different seed sizes and mixed pedigrees were evaluated for two years in field trials of three replications laid out in a randomized complete block design. Data collected on plant vigour indices, yield components and seed yield were analyzed for variance components, Pearson correlation coefficient and structural equation modeling for path analysis. The accessions exhibited significant variation for all yield components including seed yield. In addition, the variance estimates indicated that substantial variations recorded were mostly genetic with high heritability values. Earliness in flowering and pod maturity recorded highly significant correlations and direct effect with yield components and seed yield. Positive correlation between precocity and high yield could be exploited in the development of improved varieties with early maturity for the savannah ecology with a characteristic short wet season. Importantly, all seed yield components are significantly correlated with each other and to total seed yield. Pods per plant, however, recorded highest coefficient values (r = 0.85; P < 0.001; 1.38**) for both Pearson correlation and path analysis, respectively, suggesting its importance as a yield component with highest direct effect on seed yield and should be a core selection index in cowpea breeding. The effect of size-number trade-off accounts for the counterbalance of direct effects of seeds per pod/plant (number) and seed weight (size) in cowpea and should be determined on genotype and/or seed size basis during selection. Plant vigour characters had no direct contribution to seed yield
- ItemCompatibility and fruit-set in cashew (Anacardium occidentale L.)(Springer, 2007) Olawale Mashood AliyuUnderstanding complex factors controlling yield is very crucial to the improvement of cashew in major producing countries currently experiencing very low yield and consequently making cashew farming unprofitable and the whole industry unsustainable. Eleven cashew clones were evaluated for their compatibility and fruit set between 2000 and 2002 seasons, in a diallel cross using randomized complete block design with three replications. Data collected on number of fruit set at 6 weeks after pollination were statistically analyzed. Significant differences between the parents at the 1% level, revealed the existence of variability for compatibility and fruit set, with 34% cross-compatibility, 51% partial cross-compatibility and 15% cross-incompatibility recorded, while 37% of the parents were self-compatible. Parents sharing the same apples colors tend to be highly cross-compatible, while some clones showed evidence of unilateral compatibility. Maximum value of 55% fruit set obtained from crosspollination probably indicates upper limit for fruit set in cashew. Significant correlation between compatibility and variation in fruit yield suggests the important role of parental compatibility in selection of planting materials for the establishment of cashew plantation.