Abstract
Approximately 62% of Brazilian pastures are degraded, which reduces productivity and profitability, making it essential to apply correctives and fertilizers, especially nitrogen, to promote recovery and increase grazing frequency. Therefore, this study aims to evaluate the isolated and combined effects of Azospirillum brasilense and nitrogen doses on the productivity of Urochloa cultivars. The research was conducted at the nursery of the Federal Institute of Science and Technology of Rondônia – Ariquemes Campus. The experimental design was completely randomized in a 4x6 factorial scheme, with four grass species (Urochloa ruziziensis cv. Ruziziensis, Urochloa decumbens cv. Basilisk, Urochloa brizantha cv. Marandu and Urochloa humidicola cv. Llanero), six fertilization forms consisting of three nitrogen concentrations 0, 50, and 100% with the presence and absence of Azospirillum brasilense, with four replicates. After 60 days of planting, the following evaluations were performed: total dry matter (MST), leaf (MSF), aerial part (MSPA), tiller (MSP), root (MSR), leaf fresh matter (MFF), plant height (ALT), tiller diameter (DP), number of leaves (NF), root length (CR), leaf nitrogen (N) and crude protein (CP) analyses. The Ruziziensis cultivar showed better results when inoculated with Azospirillum brasilense + 100 kg ha⁻¹ of nitrogen, while Marandu performed well with 100 kg ha⁻¹ of nitrogen without inoculant. Brasilisk was less sensitive to fertilization, and Llanero stood out in treatments without nitrogen, showing adaptability to low fertilizer conditions.
Published Version
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