ABSTRACT The use of organic compost in pasture fertilization is a form of recycling nutrients contained in waste and reducing chemical fertilizer use. To perform pasture fertilization, however, grass responses to doses of organic composts must be known. Thus, the objective of this study was to find the best dose of laying hen organic compost to maximize the productive, morphogenetic, structural, and nutritional responses of Paiaguás and Piatã grasses. A completely randomized factorial (4 × 2) design was used, composed of organic compost doses (0, 400, 800, and 1,200 kg equivalent N.ha−1) and two cultivars (Piatã and Paiaguás) of Urochloa brizantha grass with three replicates per treatment, assessed during four successive cuts. The parameters evaluated were dry matter yield (DM) of shoots and roots, leaf appearance rate (LAR), leaf elongation rate (LER), phyllochron, pseudoculm elongation rate (PER), final leaf length (FLL), number of green leaves (NGL), and senescence rate (SR). The nutritional value of the grasses was also assessed through contents of dry matter, organic matter, crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber, cellulose, hemicellulose, lignin, and in vitro organic matter digestibility (IVOMD). DM yields of both shoot and root increased due to nitrogen increase and Paiaguás grass had the highest yields (P < 0.01). The best organic compost doses ranged from 640 to 950 kg of equivalent N.ha−1 for most morphogenic and structural grass characteristics. The chemical composition of grasses was not influenced (P > 0.05) by doses of organic compost. Levels of 8.05% CP, 67.10% NDF, and 65.14% IVOMD were observed for cultivar Paiaguás, while for cultivar Piatã these values were 7.58% CP, 70.32% NDF, and 63.38% IVOMD. It is concluded that high doses of an organic compost are required (in equivalent N) for cultivars to reach the highest growth rates and that Paiaguás grass has higher dry matter yield, higher growth rates, and better chemical composition when compared to Piatã grass in similar organic fertilization conditions.

中文翻译：

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使用有机堆肥为 Piatã 和 Paiaguás 草施肥：剂量对形态发生、结构、营养和生产特性的影响

摘要 在牧场施肥中使用有机堆肥是一种回收废物中所含养分并减少化肥使用的形式。然而，要进行牧场施肥，必须了解草对有机堆肥剂量的反应。因此，本研究的目的是找到最佳剂量的蛋鸡有机堆肥，以最大限度地提高 Paiaguás 和 Piatã 草的生产力、形态发生、结构和营养反应。使用完全随机的析因 (4 × 2) 设计，由有机堆肥剂量（0、400、800 和 1,200 kg 当量 N.ha-1）和两个品种（Piatã 和 Paiaguás）组成，三个重复每次治疗，在连续四次切割期间进行评估。评估的参数是芽和根的干物质产量 (DM)、叶片出现率 (LAR)、叶伸长率 (LER)、phyllochron、假茎伸长率 (PER)、最终叶长 (FLL)、绿叶数 (NGL) 和衰老率 (SR)。草的营养价值还通过干物质、有机物质、粗蛋白 (CP)、中性洗涤纤维 (NDF)、酸性洗涤纤维、纤维素、半纤维素、木质素和体外有机物质消化率 (IVOMD) 的含量来评估. 由于氮的增加，地上部和根部的干物质产量增加，Paiaguás 草的产量最高（P < 0.01）。对于大多数形态发生和结构性草特征，最佳有机堆肥剂量范围为 640 至 950 kg 的等效 N.ha-1。草的化学成分不受有机堆肥剂量的影响（P > 0.05）。8.05% CP、67.10% NDF 和 65 的水平。观察到栽培品种 Paiaguás 的 IVOMD 为 14%，而栽培品种 Piatã 的这些值为 7.58% CP、70.32% NDF 和 63.38% IVOMD。得出的结论是，栽培品种需要高剂量的有机堆肥（以当量 N 计）才能达到最高的生长速度，并且与类似的 Piatã 草相比，Paiaguás 草具有更高的干物质产量、更高的生长速度和更好的化学成分。有机施肥条件。