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桑品种育 71- 1具有高产、优质、抗性较强、适应性广等特点。自 1991年 ,我县引进种植 ,受到群众欢迎 ,但由于苗木价格较贵 ,给推广带来困难。针对这种情况 ,1997年 ,我们在黄尖镇花川村对该品种进行简易绿枝扦插试验 ,经过 4年实践 ,扦插成活率稳定在 85 %以上 ,而且育苗过程简单 ,不需制钵 ,省时省工 ,成本也很低 ,故在当地很快得到推广。1 扦插适期春蚕 5龄期是扦插适期 ,具体时间在 5月初至 6月 1日之间进行。2 育苗前苗床准备床地选择阳光充足 ,地势平坦 ,排水良好 ,离水源较近。整床筑畦 ,床畦宽约 1 5ｍ ,长约 15ｍ ,高度为 0 1ｍ… 相似文献
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激素对桑树扦插生根的影响 总被引：4，自引：0，他引：4
以不同时期（绿枝、硬枝）、不同部位（上部、下部）、不同品种（育151、湖桑32号、桐乡青、新一之濑）枝条为插穗,对扦插生根技术进行了探讨,阐述了激素在扦插生根中的重要作用。湖桑32号经150mg/L IBA处理后,产生的不定根最多。为完善硬枝扦插育苗技术提供依据。 相似文献
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<正>育71-1秋季绿枝扦插平床育苗是在中晚秋蚕饲养结束后,剪取半木质化的枝条作插穗,平床扦插,经塑料薄膜温床培育成桑苗的一种育苗方法。具有方法简便、省工、省本、成活率高等优点,而且可避开农忙矛盾,节省物料消耗,因而很受群众欢迎。因育71-1品种木质较松,适宜搞扦插育苗,因此绿 相似文献
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利用绿枝扦插立体育苗的方法,研究了桑树不同品种、不同部位、不同长度、不同类型及不同时期的插穗对绿枝扦插生根效果的影响,结果表明：5个供试品种中,育71-1的生根效果最好,生根率为91.1％,株平均生根数为49.1条,其次为湖桑32号、选792、大10,而湘7920的生根效果最差;育71-1和湖桑32号不同部位插穗的生根率和生根数量均为中部枝条＞下部枝条＞上部枝条,不同长度插穗的生根率和生根数量均为15 cm插稳＞18 cm插穗＞12 cm插穗;主枝做插穗的生根效果明显优于侧枝;育71-1于7月20日和8月10日2次扦插的效果最好,生根率均超过90％,9月1日扦插的生根率也有74.5％,所以使用该方法可在7月至9月连续进行2～3次扦插育苗,扦插时尽量选用主枝的中部枝条剪成15 cm插穗进行扦插. 相似文献
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<正>为提高桑树育苗效率,我们引进了全光自动喷雾绿枝扦插育苗技术,进行了湖桑育苗的应用试验,取得了良好效果。 这种方法大大缩短了育苗时间,一年可育苗2～3次。我们设置了直径20m与直径8m的大小扦插育苗圆盘各4个,共1756m~2,移栽面积31亩。1993年共扦插育苗2批,第1批于5月28～29日扦插,共插湖桑32号76.37万株（尚有其它品种3000余株）,成活70.03万株,扦插成活率为91.3％;移栽成活61.4万株,移栽成活率为80.4％。第2批于7月21～22日扦插,共插48.3万株,成活44.2万株,成活率91.5％,因生长期短,直接留床不移栽。当年育成甲级苗6.6万株,乙级苗30.5万株,丙级苗59.4万株,丙级以下苗8.65万株。 相似文献
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优良桑品种育71-1具有枝条直立、节间密、发芽早、叶形大、叶肉厚、产叶量高、叶质好等优点,深受广大蚕农欢迎。但该品种因木质较松,嫁接成活率相对而言不太理想,因而采取春秋季绿枝扦插育苗的方法。育71-1春秋季绿枝扦插育苗具有方法简便、省工、省本、成活率高、成苗快、植株健壮等优点,而且其特点显著:春季绿枝扦插育苗周期短、苗木根系发达;秋季绿枝扦插可避开农忙矛盾,节省物料消耗,因而很受群众欢迎。夏秋季扦插育苗制作土钵,也可搞平床扦插,但由于平床扦插育苗操作更简便,所以更易为群众接受。现就如何提高育71-1春秋季绿枝扦插育苗… 相似文献
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桑树绿枝扦插育苗,是在春蚕5龄期结合采叶养蚕,利用伐条桑的新梢和秋条的新梢作插穗,育成桑苗的快速育苗法。此法育苗技术简单,取材容易,成本低,成苗率高,土地利用率高,育苗时间短,且能保存种质,是快速育苗的一种好方法。我站于1988至1990年进行边试验边推广近10万株,收到了较理想的成效,现将试验结果总结如下: 相似文献
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桑树地膜覆盖硬枝扦插育苗试验初报 总被引：4，自引：1，他引：3
<正>桑树硬枝扦插育苗法,曾有多人搞过,也都取得了较好的效果.但从方法上来看,还存在着技术要求高,实用操作麻烦等问题,难以被农民接受,生产上大面积推广受到了限制.受前人硬枝扦插育苗试验的启发,1995、1996年,我们采取地膜覆盖、桑树硬枝直插法进行了育苗试验,取得了显著效果.现将试验情况报告如下: 相似文献
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<正>湖桑绿枝土钵扦插这一育苗新枝术在80年代中期就已采用并推广,但是多年来大家很少采用其它品种进行扦插,同时管理措施的不同对扦插成活率的影响很大,为了进一步探讨不同桑品种与处理措施对绿枝土钵扦插成活率的影响,我们在1993年及1994年春季进行了有关调查试验,现将情况整理如下。一、材料和方法 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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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
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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