Soybean (Glycine max (L.)) is economically the most important bean in the world, providing vegetable protein for millions of people and ingredients for hundreds of chemical products – Britannica Encyclopaedia. Several researches have been conducted in different part of the world towards enhancing its growth and productivity. Is in this vein, that this study was conducted by Paul Yao ANANI (Agribusiness Expert, Tamale, Ghana) George NYARKO and Hypolite BAYOR (both of Faculty of Agriculture, University for Development Studies, P.O Box TL1882. Nyankpala Campus, Ghana).
The research was conducted to establish the effects of triple super phosphate and rhizobia inoculant on yield of soybean (Glycine Max (L)) seed quality in the Northern region of Ghana. The researchers adopted the Multi-locational trials approach in which three (3) different locations were used. Soybean foundation seeds obtained from Savannah Agriculture Research Institute were subjected to three different treatments on the field. These treatments were TSP + Inoculant, TSP only, Inoculant only and a control plot as a check. Randomize complete block design was used to allocate the treatments to the various plots. Data collected from the field included: number of days from seeding to germination, flowering and pod formation; nodule formation; plant height, number of pods per plant per treatment (Pod load), number of days to maturity, seed weight at harvest per plant per treatment (1000 seed weight) and finally, the yield was determined after harvest.
The study results revealed that the treatments (TSP + Inoculant, TSP only and Inoculant only) generally enhanced growth, development and yield of soybean seed as compared to the control plots in almost all the locations. The researchers further observed that the application of Rhizobia inoculant contributed significantly to the development of the soybean plant. It aided the fixation of atmospheric nitrogen into the soil which improved its fertility that led to the significant increase in the number of nodules that were formed by the plant. The researchers reported that the pod load was very high for all the treated plots. They were fully filled with seeds which were evidence in the yield obtained from the trials. TSP in combination with inoculants gave a very good yield of 2.66 Mt/ha and was significantly higher than all the other treatments.
The researchers therefore concluded by saying that the study’s result is a clear indication of how phosphorus fertilizer and inoculant positively affected the yield of Soybean. The however, noted that seed producers should be encouraged, in addition to good agronomic practices, to apply the recommended dosage of inoculant and TSP to their seeds and soybean fields respectively. That this would lead to early maturity and high yields.
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