Application of phosphorus and potassium for soybean (Glycine max L.) response in acidic soils of Wolaita Zone, Southern Ethiopia

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Author: 
Mesfin Bibiso, Abi M. Taddesse and Asmare Melese
Subject Area: 
Physical Sciences and Engineering
Abstract: 

This study was conducted with the objective to evaluate soybean (Glycine max L.) response to P and K fertilizer application under greenhouse condition in a pot experiment. Four representative surface soil (0-20 cm) samples were collected from Damot Sore, Boloso Bombe, Damot Pulasa, and Humbo Districts. Four rates of P (0, 23, 46 and 69 kg P2O5 ha-1) in the form of triple super phosphate (TSP) and four rates of K (0, 21.5, 43 and 64.5 kg K2O ha-1) in the form of potassium chloride (KCl) were used. The soil samples collected were planted with soybean and the treatments were arranged in a completely randomized design (CRD) with two factors in three replications. The dry weight content and P and K concentrations in the leaves of soybean plant showed significant difference at P < 0.05 level by the application of treatments. The dry weights found by the application of P69 K64.5 and P69 K21.5 markedly higher than the dry weights of the other treatments and the highest K concentrations in the leaves of the soybean plant were observed by the application of P69 K21.5 and P69 K64.5 for Damot Sore District. For Boloso Bombe District, the highest P concentration was recorded by the application of P69 K21.5, P69 K43 and P69 K64.5 and the lowest P concentration was obtained by the application of P0 K0. The highest concentration of K in the plant leaves was observed by the application of P23 K43. The amount of fertilizer applied at the rate of P46 K21.5 significantly increased the K concentration in the leaves of soybean plant (43.6 g kg-1) for Damot Pulasa Districts. For Humbo site, the amount of fertilizer applied at the rate of P46 K21.5, significantly increased the K concentration in the leaves of soybean plant (43.6 g kg-1) whereas, the control treatment (P0 K0) has the lowest K concentration in the leaves of the plant (12.1 g kg-1). Therefore, application of P and K containing fertilizers had a positive impact on growth of the plants in acidic soils. However, further study is recommended to confirm these findings under field conditions.

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