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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Effects of nitrogen and harvesting time on chemical composition of biomass of Sudan grass, fodder sorghum, and their hybrid
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Effects of nitrogen and harvesting time on chemical composition of biomass of Sudan grass, fodder sorghum, and their hybrid

机译：氮素和收获时间对苏丹草，饲料高粱及其杂种生物量化学成分的影响

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The subject of this study is 2-year variability research (2007 and 2008) of the chemical composition of naturally dried biomass samples of 3 different sorghum species, which are widely used in the southeast Balkans. Samples of Sudan grass Zora, fodder sorghum NS-Dzin, and their hybrid Siloking were examined based on the quantity of used nitrogen and the harvest time. Plants were grown in the experimental field of Radmilovac (property of the Faculty of Agriculture in Belgrade) in a randomized block, split-split plot design with 3 replications for 2 years. Naturally dried biomass with the highest amount of total proteins was obtained by mowing during the stem elongation phase (plant height, 100-120 cm). By subsequent mowing in the tasseling phase, the amount of total proteins and mineral substances in the biomass decreased, while the amount of carbohydrates and cellulose significantly increased. The content of lipids in the samples tested differed depending on the cultivar, but this variation was not statistically significant. By increasing the intensity of plant nitrogen nutrition, the total protein content in the tested samples was increased. Due to the large amounts of nonprotein nitrogen compounds, the fraction of digestible proteins did not increase. According to the established chemical composition of the silage sorghum hay, the total digestibility of nutritive components of the tested samples was determined to be satisfactory, above 51%. The highest quality biomass was obtained by mowing the hybrid of sorghum and Sudan grass during the stem elongation phase. The most suitable nitrogen dose of 80-120 kg and harvest during the tasseling period were the best for all 3 cultivars. Key words: Chemical composition, fodder sorghum, harvest period, nitrogen, Sudan grass
机译：这项研究的主题是2年变异性研究（2007年和2008年），对3种不同高粱物种的自然干燥生物质样品的化学组成进行了研究，这些样品在巴尔干东南部广泛使用。根据使用的氮量和收获时间，对苏丹草Zora，饲料高粱NS-Dzin及其杂交Siloking的样品进行了检查。将植物在Radmilovac（贝尔格莱德农学院的财产）的实验田中进行随机分组，分块-样地设计，并进行3次重复培养，持续2年。通过在茎伸长期（植物高度，100-120 cm）修剪，可获得具有最高总蛋白量的自然干燥生物质。通过随后在抽穗期进行割草，生物质中的总蛋白质和矿物质的量减少，而碳水化合物和纤维素的量显着增加。测试样品中脂质的含量因品种而异，但是这种变化在统计学上并不显着。通过增加植物氮素营养的强度，增加了测试样品中的总蛋白质含量。由于大量的非蛋白质氮化合物，可消化蛋白质的比例并未增加。根据确定的青贮高粱干草的化学组成，确定测试样品中营养成分的总消化率令人满意，高于51％。通过在茎伸长期修剪高粱和苏丹草的杂种，可获得最高质量的生物质。抽穗期最适宜的氮素剂量为80-120 kg，收获期为所有3个品种的最佳。关键词：化学成分饲料高粱收获期氮苏丹草

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