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青南牧区不同处理下燕麦生产性能的分析 总被引：7，自引：0，他引：7
以不同燕麦品种、施尿素量、行距和播量在青海果洛州达日县进行正交试验表明,各因素对燕麦株高的影响均极显著,燕麦生长期间各处理生长速率的峰值分别出现在分蘖盛期、拔节盛期和孕穗盛期,最快生长期出现在7月14日至23日拔节盛期。获得最高产草量的最适行距、施尿素量和播种量分别为13.2 cm、250kg/hm2和250 kg/hm2。燕麦在试验地区生殖生长期不足,单蘖穗重占单蘖重的比例较低,而单蘖茎重则成为单蘖重的主要结构成分。与单蘖重关系最显著的是单蘖茎重,其次为单蘖叶重和秆径,而单蘖穗重与之相关不显著。 相似文献
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青南牧区不同处理下燕麦生产牲能的分析 总被引：1，自引：0，他引：1
以不同燕麦品种、施尿素量、行距和播量在青海果洛州达日县进行正交试验表明，各因素对燕麦株高的影响均极显著，燕麦生长期间各处理生长速率的峰值分别出现在分蘖盛期、拔节盛期和孕穗盛期，最快生长期出现在7月14日至23日拔节盛期。获得最高产草量的最适行距、施尿素量和播种量分别为13、2cm、250kg/hm^2和250kg/hm^2。燕麦在试验地区生殖生长期不足，单蘖穗重占单蘖重的比例较低，而单蘖茎重则成为单蘖重的主要结构成分。与单蘖重关系最显著的是单蘖茎重，其次为单蘖叶重和秆径，而单蘖穗重与之相关不显著。 相似文献
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氮肥对燕麦生长速率的影响 总被引：1，自引：0，他引：1
利用8个施氮肥梯度在青海省湟中县进行燕麦施肥试验,测定了不同氮肥水平下燕麦在不同生育期的生长速率.结果表明:燕麦株高的快速生长期在拔节至开花期,最大生长率3.56cm/d出现在拔节至孕穗期;燕麦地上生物量和地下生物量的快速生长期在孕穗至开花期,地上生物量最大生长率101g/m2/d出现在抽穗期-开花期,地下生物量最大生长率3.37g/株/d出现在孕穗-抽穗期,均为施肥量120kg/hm2时最大.在燕麦生长早期,高施肥量对燕麦的生长无显著影响,但在快速生长期中高施肥量较低施肥量或不施肥有更显著效应.就燕麦草生产而言,以选择75 ～ 90kg/hm2的施氮量为佳;而就燕麦种子生产而言,以60kg/hm2的施氮量为佳. 相似文献
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高寒牧区燕麦生产性能的初步分析 总被引：62，自引：6，他引：56
在青藏高寒牧区进行１３个燕麦品种的比较试验,方差分析和新复极差测验结果表明,品种间产草量差异显著,基中加拿达,甜燕麦,８７－４４４等品种明显高于当地农家品种黄燕麦。对参试品种的平均单蘖重与单蘖叶重,单蘖茎重,单蘖穗重,株高,秆径和单株分蘖数的回归分析结果,建立经ｔ测验回归系数显著的一组回归方程,尤以单蘖茎重与单蘖重的关系最为密切,相关系数达０．９９１３。 相似文献
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为明确青燕1号燕麦适宜的氮肥施量和播种量,采用随机区组设计,设置3个播种量和5个施氮水平,研究氮肥和播种量对燕麦穗部性状和种子产量的影响.结果 表明,施氮量、播种量及其交互作用对种子产量和穗部性状有显著影响(P＜0.001).种子产量随施氮量和播种量的增加先增加后降低,最大值出现在90 kg/hm2氮肥施用量和180 kg/hm2播种量.穗部性状随施氮量和播种量变化明显,穗长、每穗小穗数、每穗粒数、每穗粒重和千粒重均随着施氮量增加先增加后降低,随播种量的增加而降低.燕麦种子产量与穗长和每穗小穗数极显著相关(P＜0.01),与每穗粒数和每穗粒重之间存在显著相关性(P＜0.05).因此,90 kg/hm2氮肥施用量和180 kg/hm2播种量是湟中及周边地区种植燕麦的适宜栽培措施. 相似文献
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在黑龙江省逊克县车陆乡,应用正交试验设计对苜蓿进行行距、灌水、施肥种类、施氮肥试验.试验结果表明,行距以15 cm处理产草量最高,每公顷产干草6 483.3 kg,比45 cm处理增产干草10.04%;在苜蓿返青期灌水1次,增产效果最好,优于其他处理;施磷酸二铵150 kg/hm2产干草6 928.7 kg/hm,增产效果最佳,比施复合肥150 kg/hm2增产干草22.6%(P＜0.01)和施有机肥22 500 kg/hm增产干草11.04%,施有机肥比施复合肥增产10.5%;施尿素75 kg/hm2增产效果好于施尿素112.5 kg/hm2和150 kg/hm2处理;处理1(行距15 cm,灌水1次,施磷酸二铵150 kg/hm2,施氮肥75 kg/hm2)产干草7 637 kg/hm2,显著高于其他处理,增产6.8%～48.7%,比处理3和处理4、5、8、9、7表现增产差异达到极显著或显著水平. 相似文献
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松嫩平原苜蓿高产栽培技术研究 总被引：1，自引：1，他引：0
在松嫩平原,应用正交试验对苜蓿产量进行行距、灌水、施肥影响研究.结果表明,以30cm行距处理产草量最高,干草产量15389.66kg/hm2;灌水以3次和1次为好;施农家肥22500kg/hm2增产效果好于施磷酸二铵150kg/hm2和施复合肥150kg/hm2处理;施尿素112.5kg/hm2增产效果最佳,平均产干草14673.61kg/hm2;行距30cm、灌水3次、施磷酸二铵150kg/hm2、施氮肥112.5kg/hm2处理产干草19395.83kg/hm2,极显著高于其它处理. 相似文献
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在黑龙江省齐齐哈尔市,应用正交试验设计对苜蓿进行行距、灌水、施肥种类及施氮肥试验。试验结果表明,行距以30 cm处理产草量最高,每公顷产干草11 049 kg,比45 cm处理增产干草9.9%,差异显著(P<0.05);以灌水1次为好;施农家肥22 500 kg/hm2产干草11 403 kg/hm2,增产效果最佳,比施复合肥150 kg/hm2增产干草17.1%(P<0.05)和施磷酸二铵150 kg/hm2增产干草6.6%(P<0.05),施磷酸二铵比施复合肥增产9.8%(P<0.05);施尿素112.5 kg/hm2增产效果好于施尿素75 kg/hm2和150 kg/hm2处理;处理6(行距30 cm,灌水3次,施磷酸二铵150 kg/hm2,施氮肥112.5 kg/hm)2和处理2(行距15 cm,灌水2次,施农家肥22 500 kg/hm2,施氮肥112.5 kg/hm)2分别产干草11 818 kg/hm2和11 730 kg/hm2,显著高于其他处理。 相似文献
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在黑龙江省逊克县车陆乡,应用正交试验设计对苜蓿进行行距、灌水、施肥种类、施氮肥试验。试验结果表明,行距以15cm处理产草量最高,每公顷产干草6483.3kg,比45cm处理增产干草10.04%;在苜蓿返青期灌水1次,增产效果最好,优于其他处理;施磷酸二铵150kg/hm2产干草6928.7kg/hm2,增产效果最佳,比施复合肥150kg/hm2增产干草22.6%(P<0.01)和施有机肥22500kg/hm2增产干草11.04%,施有机肥比施复合肥增产10.5%;施尿素75kg/hm2增产效果好于施尿素112.5kg/hm2和150kg/hm2处理;处理1(行距15cm,灌水1次,施磷酸二铵150kg/hm2,施氮肥75kg/hm2)产干草7637kg/hm2,显著高于其他处理,增产6.8%￣48.7%,比处理3和处理4、5、8、9、7表现增产差异达到极显著或显著水平。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献