Morphogenic, structural, productive and bromatological characteristics of Braquiária in silvopastoral system under nitrogen doses

Abstract

his study aimed to evaluate the effect of different doses of nitrogen fertilization on the morphogenic, structural, productive and chemical composition of Urochloa decumbens (Stapf) R. D. Webster cv. Basilisk in a silvopastoral system with eucalyptus. The experimental treatments consisted of pastures of Basilisk cultivar, fertilized with 0, 100, 200, 300 and 400 kg ha-1 year-1 of N, and intercropped with eucalyptus, clone GG 100 (Eucalyptus grandis x E. urophylla). The experimental arrangement followed a randomized block design with four replicates. The evaluated characteristics were: foliar appearance rate, phyllochron, leaf length, leaf elongation rate, leaf life span, foliar senescence rate, number of green leaves per tiller, number of senescent leaves per tiller, daily dry matter accumulation, dry matter production, crude protein, and neutral detergent fiber. In the conditions of the established silvopastoral system, nitrogen fertilization did not influence (p > 0.05) the morphogenic and structural characteristics of Basilisk cultivar, except for height (p < 0.01) and leaf: stem ratio (p = 0.02). The nitrogen fertilization of the Brachiaria grass with eucalyptus in the proposed structural arrangement does not modify (p > 0.05) the morphogenic characteristics. However, in ration to dry matter production, doses of up to 400 kg of N ha-1 are recommended.

Ammonia Volatilization, Forage Accumulation, and Nutritive Value of Marandu Palisade Grass Pastures in Different N Sources and Doses

“…These factors explain the higher NDF and lower CP contents in cut 4 (Table 2). The environmental conditions did not intensely impact the ADF levels, which had smaller variations in the mean, while the effect of fertilization with N on this variable is diverse, being able to increase [46], decrease [51], cause a quadratic effect [50] or have no effect [6,8].…”

Pasture management and greenhouse gases emissions

“…Nitrogen fertilization increases productivity, improves in the chemical and morphological characteristics of forage (Marques et al 2017;Carvalho et al 2019), and promotes weight gain per animal and per unit area (Delevatti et al 2019). However, inadequate use of nitrogen fertilizers can increase GHG emission (Raposo et al 2020;Grassmann et al 2020;Smith et al 2020).…”

Técnicas e tecnologias de mitigação de gases na produção animal

“…Em função dessa crescente necessidade de aumento da produtividade, é necessário conhecimentos técnicos e científicos visando minimizar emissões de GEE, relacionado a produção agropecuária. Dentro dos aspectos agronômicos, algumas técnicas se destacam, como o correto manejo das pastagens, adubação nitrogenada (Carvalho et al, 2019), utilização de culturas leguminosas como adubo verde, isso porque possuem a capacidade de fixação biológica do nitrogênio (Ribeiro et al, 2016). Outra alternativa é a prática dos sistemas integrados de produção agropecuária, que visam acúmulo de carbono no solo, através da palhada do capim.…”