Enhancing turnip cultivation with plant growth-promoting bacteria in organic fertilizer
DOI:
https://doi.org/10.1590/1983-21252025v3812843rcKeywords:
Brassica rapa var. Chinensis. Paenibacillus polymyxa. Azospirillum sp. Biofertilization.Abstract
The utilization of plant growth-promoting bacteria (PGPB) is considered a viable alternative to chemical fertilizers, addressing the challenge of producing food with minimal environmental impact. This study assessed the effect of Paenibacillus polymyxa and Azospirillum sp. as inoculants in anaerobic digestate and compost on the cultivation of Brassica rapa var. Chinensis (Chinese cabbage). Twelve treatments were conducted, including control with no fertilization, using a randomized complete block design (RCBD) with four replications per treatment. The total solution volume consists of diluting the concentrated inoculum in water, molasses, and anaerobic digestate in the following proportions: 10% biol or molasses, 89.65% irrigation water, and 0.4% strains of Paenibacillus polymyxa and Azospirillum sp., with a concentration of 1x109 CFU g-1 at a dose of 700 g per 200 L of water. The most favorable results in the agronomic variables of Chinese cabbage at 55 days were achieved with the treatment that used an inoculum in compost (T8) composed of 3 kg of compost, 0.4% Paenibacillus polymyxa, and 10% molasses, achieving maximum values in plant height (52.42 cm), leaf length (49.77 cm), leaf width (19.85 cm), leaf area (958.08 cm²), number of leaves per plant (19.85), and fresh weight (293.65 g). Therefore, using organic fertilizers inoculated with microorganisms is a promising alternative to enhance the growth of Chinese cabbage crops and reduce dependence on chemical fertilizers, which negatively impact the environment.
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