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冷地型鸭茅营养动态的研究 总被引：2，自引：1，他引：1
本文对日本引入的９个冷地型鸭茅品种的营养动态进行了研究。其结果表明，９个鸭茅品种的粗蛋白质含量随生育期的进展逐渐下降，以抽穗期下降的速度为快；而粗纤维的含量变化恰好相反，随生育期的推移而逐渐增加，抽穗期的粗纤维含量明显增高；粗灰分的含量变化亦呈下降趋势，但下降幅度不大。鸭茅营养物质变化的转折点是在抽穗期 相似文献
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Krishona Martinson Wayne Coblentz Craig Sheaffer 《Journal of Equine Veterinary Science》2011,31(12):711-716
Effects of harvest moisture and bale wrapping on forage quality and mold formation in orchardgrass (Dactylis glomerata L.) hay have not been investigated. The objectives of this study were to determine the effects of initial bale moisture and plastic wrapping on temperature, forage quality (protein, fiber components, and digestible energy), and mold formation in large round-baled orchardgrass hay. In all, 40 round bales of mature orchardgrass hay measuring 1.2 × 1.5 m2 were baled at three different moisture ranges (eight bales per treatment): 124 to 166 g/kg (low moisture); 180 to 232 g/kg (intermediate moisture); and 259 to 337 g/kg (high moisture). Selected bales within each moisture range were individually wrapped in plastic (16 bales), and temperature sensors were placed in each bale for up to 10 weeks. The lowest (P ≤ .01) maximum temperature and heating degree-day accumulations were observed when initial bale moisture content was 124 g/kg or when hay was wrapped, regardless of initial moisture content. In 2008 and 2009, all wrapped hays resulted in similar forage quality (P ≤ .14) and mold counts (P = .94) compared with 124 g/kg moisture hay. Hay baled at 166 g/kg resulted in fiber (P ≥ .82) and mold (P = .21) components similar to higher moisture bales. Mold counts for hay baled at 166 g/kg and 124 g/kg moisture were 24.8 × 106 and 2.7 × 104 CFU/g, respectively, demonstrating that large round bales are prone to molding at relatively low moisture concentrations. Maintenance of forage quality and reduction in mold growth were achieved by baling dry (124 g/kg moisture) or wrapping round bales of orchardgrass hay up to 337 g/kg moisture. 相似文献
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Isabelle A. Kagan Brett H. Kirch Craig D. Thatcher James R. Strickland Chris D. Teutsch François Elvinger R. Scott Pleasant 《Journal of Equine Veterinary Science》2011,31(8):488-497
Seasonal and diurnal changes in water-soluble carbohydrates (WSC) and ethanol-soluble carbohydrates (ESC), as well as in chromatographic profiles of the sugars comprising these categories, were studied in orchardgrass pastures at one location in the Piedmont region of Virginia. Grass from four experimental plots was sampled weekly in the morning and afternoon over an 8-week period (early to late spring). Tissue was air-dried to simulate hay, or frozen to preserve the sugar profiles of fresh pasture. WSC and ESC were assayed colorimetrically. To profile sugars, boiled-water extracts were separated by high-performance liquid chromatography coupled to pulsed amperometric detection. Fructan, glucose, fructose, and sucrose were quantified by high-performance liquid chromatography. All sugar concentrations were highest in the early spring in both fresh and dried tissue. Fructan chain length was highest in early spring as well. Significant diurnal differences were observed for WSC and fructan, on some dates (P < .0001 and P = .024, respectively), and for ESC, glucose, and sucrose averaged over the entire period (P = .0002, .004, and <.0001, respectively). Sucrose was barely detectable in fresh tissue but reached 1.6% to 12% dry matter in dried tissue. These results demonstrate changes in orchardgrass carbohydrates over a season, within a day, and between dried and fresh herbage. Understanding these changes may be helpful in the management of horses with a history of insulin resistance and laminitis. 相似文献
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氮肥对红三叶和鸭茅草地生产性能影响的研究 总被引：7，自引：1，他引：7
本文对红三叶和鸭茅单、混播草地对施氮肥的反应情况进行了研究，发现氮肥对鸭茅的株高、分蘖及产草量具明显的促进作用，而红三叶对氮肥的反应则不十分明显。同时施肥后，单播处理牧草的产量增幅比混播处理大。试验结果还表明，鸭茅和红三叶产量与施氮肥量均呈指数关系。通过对单播鸭茅和混播草地总产对氮肥的反应规律进行分析，可以把混播草地对氮肥的利用情况及氮肥对该草地中红三叶固氮作用影响的变化规律分为３类：第１类为混播草地投入最低氮肥量，草地生产力较低，此时红三叶能提供较高氮素价值量；第２类，混播草地投入中等氮肥量，草地生产力中等，但红三叶提供氮素的价值量减小；第３类，投入较高氮肥量，但红三叶失去提供氮素价值。本试验显示，从经济效益角度考虑，对混播草地以少施氮肥为好，特别是在０～０．３ｔ／ｈａ范围内较为适宜。 相似文献
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Krishona Martinson Hans Jung Marcia Hathaway Craig Sheaffer 《Journal of Equine Veterinary Science》2012
The objective of this research was to determine the impact of water temperature and soaking length on removal of nonstructural carbohydrate (NSC) fractions and dry matter (DM) from legume and cool-season grass hays. The experimental design was a randomized complete block with six replications. Hay types included bud and flowering alfalfa (Medicago sativa L.) and vegetative and flowering orchardgrass (Dactylis glomerata L.). Flakes were submerged for 15, 30, and 60 minutes in 25 L of cold (22°C) water, warm (39°C) water, and 12 hours in cold water, respectively. Water temperature at each soaking duration did not affect residual NSC fractions in alfalfa hays. Flowering and vegetative orchardgrass hays soaked for 30 and 60 minutes, respectively, in warm water had greater (P < .001) amounts of NSC fraction removal compared with soaking in cold water. Soaking bud and flowering alfalfa and vegetative orchardgrass hays for ≥15 minutes removed more NSC fractions compared with the control (P ≤ .005); however, soaking for 15-60 minutes resulted in similar NSC fraction removal. Conversely, in flowering orchardgrass hay, longer soaking times resulted in greater (P < .001) NSC fraction removal. Fructan removal in orchardgrass hay was greatest (P < .001) after soaking for 12 hours. DM losses were similar among hays after soaking for 15-60 minutes, but were greatest after soaking for 12 hours (P < .001). Soaking grass hay for 15-30 minutes is recommended to remove sufficient NSC fractions while minimizing DM losses. 相似文献
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在不同压力和干扰条件下鸭茅和黑麦草的竞争研究 总被引：26，自引：8，他引：18
运用ｄｅ Ｗｉｔ（１９９６）的植物竞争试验方法对鸭茅和黑麦草在不同管理条件下的竞争特性进行研究。结果表明，环境条件对两种牧草的竞争关系具有明显影响，在施肥条件下，混播草地中黑麦草的种间竞争力显著较高，鸭茅的生长和生产在一定程度上受黑麦草的竞争抑制；而在不施肥时，黑麦草对鸭茅的种间竞争力明显减弱，鸭茅对黑麦草的竞争影响程度有增加的趋势。同时，随刈割频率的增加，两种牧草的种间竞争强度相对降低，因此建议 相似文献
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[目的]选出适合重庆渝西地区进行种子生产且种子生产性能高的鸭茅品系。[方法]对目前国内外常见的几个鸭茅品系在重庆渝西地区的种子生产性能、物候期等方面进行观测和研究,选出适合渝西地区进行种子生产的产量高、品质优的鸭茅品系。[结果]鸭茅在渝西地区均具有较好的种子生产性能,其中鸭茅01076的种子产量最高,达到512 kg/hm2,并且该品系的种子发芽势、发芽率及发芽指数是最高的分别达到49%、84%和11。[结论]01076是值得在渝西地区进行大面积的种子生产的鸭茅品系。 相似文献
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To compare the effect of methods (foliar and soil) and rate of application of zinc sulphate on zinc and phosphorus uptake, tree size, yield and fruit quality of mango (Mangifera indica L.) cv. Dusheri, zinc sulphate was applied as a foliar spray application (0.25, 0.50, 1.0%) and soil (0.5, 1.0, 2.0 kg tree‐1) treatments during the second week of October (during flower bud differentiation period). All the zinc sulphate treatments of soil and foliar spray were effective in increasing the leaf zinc concentrations above recommended adequate level of (>20 mg kg‐1) whereas control trees maintained low leaf zinc concentrations (13.8 to 13.3 mg kg‐1). The uptake of foliar‐applied zinc was more rapid than that of soil applied zinc. All the treatments of zinc sulphate except the foliar spray treatment of zinc sulphate (0.25%) significantly increased zinc concentrations in the fruit pulp as compared with those in the control trees. The percent increase in the stem girth of trees was highest with the soil application of zinc sulphate (0.5 kg tree1) followed by foliar application of zinc sulphate (1.0%) as compared with all other treatments. The percent increase in the tree canopy volume was highest with the foliar application of zinc sulphate (1.0%) followed by soil application of zinc sulphate (1.0 kg tree1) as compared with control and all other treatments. There was no significant (P<0.05) increase in yield, fruit size and weight, pulp or stone weight with any treatment of zinc sulphate. Total soluble solid (TSS) in the fruit was significantly higher (18.6%) with the treatment of soil application of zinc sulphate (0.5 kg tree1) as compared with all other treatments of zinc sulphate and the control. Acid and sugar content of the fruit was not significantly affected by the foliar or soil application of zinc sulphate. 相似文献
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