African scarlet garden egg performance and soil microbial population as affected by muriate of potash application
DOI:
https://doi.org/10.30681/rcaa.v23i1.13288Keywords:
soil microbial communities, potassium fertiliser, Solanum aethiopicum gr. Gilo (L), soil improvementAbstract
IIntensifying land use for garden egg cultivation to meet the nutritional needs of the increasing population resulted in crop yield decline over time when nutrients removed through crop harvest and erosion are not replenished. In resolving deficiencies such as K in the soil, there is a shortage of information on their effect on associated soil microbial changes. Therefore, this study investigates the impact of muriate of potash (MOP) on garden egg growth and changes in microbial population. Using 10 kg soil in a repeated screenhouse experiment, MOP at 0, 15, 30, and 45 kg K2O ha-1 were evaluated in a completely randomised design with four replicates. Data collected on growth and yield parameters were subjected to analysis of variance using SAS software version 9.0. The significantly different means were separated using LSD at p<0,05 probability level. Plant height, number of leaves, and leaf area were similar among treatments during the first and second plantings, but the values were optimum at 25 and 30 kg K2O ha-1 of MOP, respectively. The dry shoot weight differed significantly among the treatments and ranged from 70,13 to 81,63 and 84,61 to 253,85 g plant-1 with the optimum values at 14.53 and 16.60 kg K2O ha-1 of MOP during the first and second plantings, respectively. However, the fruit yields were significantly different among the treatments with the optimum yields observed at 30.81 and 23.05 kg K2O ha-1 of MOP in the first and second plantings, while 15 and 45 kg K2O ha-1 treatments had similar yields during both plantings. The negative regression curves equations indicated that a higher K application of 45 kg K2O ha-1, garden eggs' dry shoot weight and fruit yield decreased. During the two plantings, the garden egg plants encouraged bacterial and fungal colonies more than those observed before planting. Bacterial and fungal colonies were optimal at 25.29 and 26.75, and 33.85 and 23.25 kg K2O ha-1 with significantly high R2 values during the first and second plantings, respectively. Due to environmetal cost, applying MOP at 25 kg K2O ha-1 was considered most appropriate for optimum garden egg yield
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