Avaliação da flutuação de fitomassa em áreas de pastejo de bovinos curraleiro pé-duro em diferentes épocas do ano

Abstract

The objective of this study was to assess the fluctuation of phytomass in grazing areas of CPD cattle during different times of the year. Samples were collected from November 2023 to September 2024 in three areas: Mimosa woodland, Mombaça area, and Mimoso area. Available phytomass was sampled using a 0.5 x 0.5 m² quadrat along three transects, weighed, and aliquots were taken for bromatological analysis. Soil cover percentage was estimated based on visual assessment of uncovered soil within the sampling square. The statistical design used was a completely randomized design (DIC) with four treatments (sampling times) and 30 repetitions. Means were subjected to Tukey's test at 5% significance level using Sisvar software. In the Mombaça area, the phytomass showed the following fluctuations: dry-rainy (2197.14 kg DM/ha); rainy-dry (4558.00 kg DM/ha); dry (4757.50 kg DM/ha), with an amplitude of 116% or 2,559.86 kg DM/ha per year. In the Mimosa woodland, the fluctuations were as follows: dry-rainy (4311 kg DM/ha); rainy (3970 kg DM/ha); rainy-dry (2109.66 kg DM/ha); dry (2839.31 kg DM/ha), with an amplitude of 104.3% or 2,201.34 kg DM/ha. The Mimoso area, among the three, was the least productive, with the following fluctuations in phytomass: dry-rainy (66 kg DM/ha); rainy (1396 kg DM/ha); rainy-dry (640 kg DM/ha); dry (433 kg DM/ha), with an amplitude of 2015% or 1330 kg DM/ha. The Mimoso area was the least productive and experienced the greatest fluctuation in phytomass across different times of the year.