Potential of nitrogen-fixing purple non-sulfur bacteria isolated from acid sulfate soil in improvements of soil property, nutrient uptake, and yield of pineapple (Ananas comosus L. Merrill) under acidic stress

Tran Ngoc Huua, Bui The Vinha, Le Chau Tua, Do Thi Xuanb and Nguyen Quoc Khuonga
a Can Tho University, Faculty of Crop Science, College of Agriculture, Can Tho, Vietnam
b Can Tho University, Institute of Food and Biotechnology, Can Tho, Vietnam

Abstract

Tran Ngoc Huu, Bui The Vinh, Le Chau Tu, Do Thi Xuan & Nguyen Quoc Khuong (2024). Potential of nitrogen-fixing purple non-sulfur bacteria isolated from acid sulfate soil in improvements of soil property, nutrient uptake, and yield of pineapple (Ananas comosus L. Merrill) under acidic stress. Bulg. J. Agric. Sci., 30(2), 234–246

The study was aimed to assess the potency of nitrogen (N)-fixing purple non-sulfur bacteria (NF-PNSB) on ameliorating soil quality, N uptake, and yield of pineapple in acid sulfate soil. The experiment, following a completely randomized block design, had two factors: (i) supplementation of biofertilizers containing the NF-PNSB (No applied bacteria, Rhodobacter sphaeroides W15, W39, and a mixture of both W15 and W39) and (ii) levels of N fertilizer [0, 50, 75, and 100% N of recommended fertilizer formula (RFF)]. Results demonstrated that supplying biofertilizers containing the mixture of both W15and W39 increased the values of pHH2O and NH4+, and decreased the values of EC, Al3+, and Fe2+ at a soil depth of 0–20 cm, in comparison with the no supplied biofertilizers, by 15.8, 39.9, 26.9, 17.8, and 52.9%, respectively. Applying biofertilizers enhanced the total N uptake by 28.9%, resulting in greater growth and a 22.9% increase in pineapple yield, in comparison with the no biofertilizers supplied treatments. Supplying the two strains W15and W39 not only contributed to reducing 25% N of RFF but also preserved the pineapple yield, compared to the fertilizing 100% N of RFF. Both W15 and W39 are potent for use as crop yield enhancers.

Keywords: acid sulfate soil; pineapple; purple nonsulfur bacteria; Rhodobacter sphaeroides

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