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首页> 外文期刊>Australian Journal of Crop Science >Mixed production of Alexandergrass and sorghum under nitrogen fertilization and grazing intensities
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Mixed production of Alexandergrass and sorghum under nitrogen fertilization and grazing intensities

机译：氮肥和放牧强度下亚历山大草与高粱的混产

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摘要

Annual pasture specie are used in southern Brazil to supply forage in the fall and spring when major forage species have their productivity diminished. Forage sorghum (Sorghum bicolor, (L.) Moench) is a suitable option that has been adopted by farmers due to its high quality as forage. It has been observed that in areas where forage sorghum is cultivated, alexandergrass (Urochloa plantaginea) usually appear as a spontaneous specie. The aim of this study was to observe the effect of two grazing intensities (30 and 60 cm of sward height) and two nitrogen fertilization levels (0 and 200 kg N ha -1 ) on the quantity (forage mass), quality (CP, ADF, NDF, Lignin, Hemicellulose, Cellulose) and morphological components (stem, leaves, senesced material) of sorghum-alexandergrass mixed pasture grazed by beef cattle. Treatments were arranged in a completed randomized block design with three replications in a 2 x 2 factorial scheme. Forage mass was increased during the evaluation period. In the first period, production was 4,022 kg and it reached 5,233kg DM ha -1 in the third period. Treatments did not affect AG-sorghum mixed pasture botanical profile or quality. It was observed that Sorghum lowered its contribution from 63.4% in the first evaluation period to 21.5% in the third. In contrast, Alexandregrass (AG), contribution increased from 17.9 to 52.7% throughout the evaluation periods. Therefore, the addition of Alexandergrass to a planted sorghum pasture is encouraged because it can extend the grazing period into the fall by prolonging the pasture favorable sward structure and nutritive value.
机译：当南部和南部的牧草生产力下降时，巴西南部的一年一度的牧草会在秋天和春季提供牧草。饲草高粱（Sorghum bicolor，（L.）Moench）是一种适合的选择，由于其高品质的饲草而被农民采用。已经观察到，在种植饲料高粱的地区，亚历山大草（Urochloa plantaginea）通常表现为自发物种。这项研究的目的是观察两种放牧强度（草高30和60 cm）和两种氮肥水平（0和200 kg N ha -1）对数量（草料质量），质量（CP， ADF，NDF，木质素，半纤维素，纤维素）和肉牛放牧的高粱-亚历山大草混合牧场的形态成分（茎，叶，衰老的物质）。以完整的随机区组设计安排治疗，并以2 x 2析因方案重复3次。在评估期间，草料质量增加。第一阶段的产量为4,022千克，第三阶段的产量为5,233千克DM ha -1。处理并未影响AG-高粱混合牧场的植物学特征或品质。据观察，高粱将其贡献率从第一个评估期的63.4％降低到了第三个评估期的21.5％。相比之下，Alexanderegrass（AG）的贡献在整个评估期间从17.9增加到52.7％。因此，鼓励在种植的高粱草场中添加亚历山大草，因为它可以通过延长草场的有利草皮结构和营养价值，将放牧期延长至秋季。

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