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在分析云南省姚安县光禄镇桑园低产原因的基础上,提出了加强管理、补植加密、改良土壤、老树复壮等低产桑园的改良措施,为光禄镇蚕农改良低产桑园、提高桑园和蚕茧产量提供参考. 相似文献
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本文对嘉兴平原桑园土壤性状进行了调查,对典型的高低产桑园的肥力进行了分析,查明了高低产桑园土壤在物理性状和养分状况方面的差异。并根据现有资料提出了高产桑园的土壤肥力指标,认为要有效地提高低产桑园的产叶量,其耕作及肥培管理的方向应以高产桑园土壤肥力指标为目标。 相似文献
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低产桑园大多是缺株较多、树龄衰老、条数较少、品种不良、病虫危害等原因造成的,改造低产桑园是提高桑叶产量、稳定蚕桑生产的重要举措.文章通过分析桑园老化低产的原因,提出改造的措施和改造后的桑园管理办法,有效实现提高种桑养蚕的经济效益的目的. 相似文献
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姜堰市部分桑园经过多年收获,加之经营管理粗放等方面的原因,桑园株数和每株条数有所减少,单位面积产量逐年下降.近年来,该市不断强化桑园管理技术,大力推广低产桑园改造措施,取得了明显成效,桑叶产量和质量不断提高.在当前土地越来越紧张的情况下,采取增产不增面积的低产桑园改造有着十分重要的意义. 相似文献
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通过调查研究，明确嘉兴平原高低产桑园，是由于土壤本身属性的差异及长期培肥管理上的不同而造成，桑园平衡持续高产，试拟高产桑园土壤的肥力指标，低产桑园土壤的改良，提出若干建议。 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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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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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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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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