Abstract This study was conducted to evaluate the effects of solid biofertilizer (SBF) containing potassium-solubilizing purple nonsulfur bacteria (K-PNSB), including Cereibacter sphaeroides M-Sl-09, Rhodopseudomonas thermotolerans M-So-11, and Rhodopseudomonas palustris M-So-14, on soil properties, K uptake, growth, and yield of hybrid maize cultivated in dyked alluvial soil collected from an Phu, An Giang. A two-factor experiment was arranged in a completely randomized design with four replications. The first factor was K fertilizer levels (0, 25, 50, 75, and 100 % of the recommended rate), and the second was SBF types (sterile water only, single strains M-Sl-09, M-So-11, M-So-14, or a mixture of all three strains). The application of SBF containing either single or mixed K-PNSB strains significantly enhanced soil exchangeable K, total K uptake, plant growth, and grain yield compared with the uninoculated control. The highest yield and total K uptake were recorded under 100 % K fertilizer combined with the three-strain SBF (106.5 g plant −1 ), demonstrating a strong synergistic interaction between biofertilizer and K application. These findings suggest that K-PNSB-based biofertilizer can improve potassium availability and maize productivity in nutrient-depleted dyked alluvial soils.
Ngoc et al. (Thu,) studied this question.
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