Dados de replicação para: Agronomic performance and silage quality of Massai grass fertilized with organic and inorganic nitrogen sources

In this study, we aimed to evaluate the effects of different nitrogen fertilization sources on the growth and biomass yield of Massai grass, as well as on the chemical composition of the resulting silage at harvest. A completely randomized design was used with three treatments and eight replicates: poultry litter (PL), cattle manure (CM), and urea. Productive and structural variables were analyzed, including canopy height, tiller population density (TPD), live leaf count (LLC), and total forage biomass. Chemical variables of the silage were also evaluated, including dry matter, moisture, mineral matter, organic matter, neutral detergent fiber (NDF), acid detergent fiber, crude protein (CP), ether extract, total carbohydrates, and non-fibrous carbohydrates. The type of nitrogen source significantly affected canopy structure (P < 0.05), with urea showing superior values for TPD and LLC. In terms of silage composition, significant differences (P < 0.05) were observed only for NDF and CP. The CM treatment exhibited the highest NDF (69.55%) and the lowest CP (5.90%) compared to those of the urea and PL treatments. Organic fertilization with PL or CM can enhance biomass production without compromising silage quality, and a nitrogen application rate of 300 kg N ha-1 yielded the best results for forage biomass.

本研究旨在评估不同氮肥源对马萨伊草（Massai grass）生长及生物量产量的影响，同时考察收获后所得青贮饲料的化学成分。本试验采用完全随机设计，设置3个处理组与8次生物学重复，处理分别为家禽垫料肥（PL）、牛粪肥（CM）与尿素。本研究分析了多项生产与结构性状，包括冠层高度、分蘖种群密度（TPD）、活叶数（LLC）以及总饲草生物量；同时测定了青贮饲料的多项化学指标，涵盖干物质、水分、粗灰分、有机质、中性洗涤纤维（NDF）、酸性洗涤纤维、粗蛋白（CP）、粗脂肪、总碳水化合物以及非纤维碳水化合物。结果表明，氮肥源类型对冠层结构存在显著影响（P < 0.05），其中尿素处理的分蘖种群密度与活叶数均表现最优。就青贮饲料成分而言，仅中性洗涤纤维与粗蛋白两项指标存在显著差异（P < 0.05）；相较于尿素与家禽垫料肥处理，牛粪肥处理的中性洗涤纤维含量最高（69.55%），粗蛋白含量最低（5.90%）。采用家禽垫料肥或牛粪肥进行有机施肥，可在不降低青贮饲料品质的前提下提升生物量产量；当施氮量为300 kg N·ha⁻¹时，饲草生物量效果最佳。