不同密度对苎麻产量影响的相关分析

试验结果表明,当年种植的一龄麻,以亩栽4000蔸的产量为最高,亩栽2000蔸的为最低。增产的主要原因是有效株数多,麻株高。二龄麻以亩栽3000蔸的为最高,增产的原因是在合适密度下,每亩有效株数达到最多,而其他产量构成因素如株高、茎粗、皮厚和出麻率等无明显下降。通径分析表明,在较稀密度下,各产量构成因素影响产量的顺序,应为茎粗>株高>出麻率>皮厚;在较高密度下,则是茎粗>出麻率>株高、皮厚。说明在各种密度下,增加茎粗是提高产量的重要因素。     

3SFZ-30型深翻锄的综合分析

根据由分析确定的锄齿翻耕的静轨迹曲线,运用解析法进行精确的轨迹综合,同时编制了一整套相应的程序,并将计算机综合结果与图解法的结果进行了对比。对3SFZ-30型深翻锄的设计进行了探讨。     

ND─EDS二联油乳剂灭活苗的研制

用鸡新城疫（ＮＤ）克隆３０毒株接种鸡胚，鸡产蛋下降综合症（ＥＤＳ）ＢＨ９１毒株接种鸭胚，分别收获ＮＤ鸡胚尿囊液毒和ＥＤＳ鸭胚尿囊液毒，用福尔马林灭活，二者混合后，加入１０号白油油相中，制成ＮＤ─ＥＤＳ二联油乳剂灭活苗。该苗接种在产前母鸡，可使接种鸡获得对ＮＤ和ＥＤＳ强毒攻击坚强的抵抗力。该苗安全、稳定，４℃保存期至少可达１２个月以上，适用于基层推广使用。     

农业产业结构调整的策略分析——对湘潭市农业产业结构调整的考察

在对湘潭市农业产业现状进行考察分析的基础上，论述了农业产业结构调整的必要性和调整思路。提出了政府引导、财政补贴、发展奶业；加大科技投入、开发地域特色农产品；拓展家庭养殖种类，扩大鹅鸭业向纵深产业发展；合理规划、因地制宜，促进小城镇发展；利用生态优势，适当增加特种种植和养殖规模等产业结构调整的具体措施。     

福建番石榴上的一种新病害—棒盘孢枝枯病

本文首次报道番石榴棒盘孢枝枯病在福建连江的发生及为害情况,并描述了该病的症状及其病原菌(Coryneum psidii Sutton)形态。     

DRS超声动物妊娠检查仪直肠内诊断乳牛早期妊娠的初步研究

本试验利用DRS超声动物妊娠检查仪对286头奶牛进行了早期妊娠探测。总的探测准确率为93.1%。其中最早检出时间在配后15～16天。探测准确率为91.3%。配后17～21天的探测准确率为92.3％,配后31～60天的探测准确率为95.0%,未孕空怀牛的探测准确率为100％。我们认为这一方法操作简便,且能更早地作出诊断,探测准确率较高,可满足生产上的需要。     

大学图书馆网站建设的思考——以塔里木大学图书馆网站为例

本文分析了国内大学图书馆网站建设的环境及其重要性,总结了大学图书馆网站的特点与功能,提出了大学图书馆网站建设的设计思路。     

Establishment of Plant Acceptor System for Hyperosmosis Transformation.

Calli and adventitious buds induced from different explants such as young stems and leaves of tomato variety Moneymaker,and mature embryos and young spikelets of rice variety TP309 were used to establish hyperosmotic transformation system at various osmotica treatments.The results revealed that the calli induced from tomato young leaves and rice young spikelets were the ideal transfomation acceptor.The cells fo calli were still vigorous when treated with 0.75 mol/L hyperosmotic solution for 4 hours.The differentiation rates of calli varied from 7.5% to 93.3% in different media.The bud differentiation was apparently inhibited by hyperosmotic treatments.0.75mol/L sucrose hypertonic solution and 0.2mol/L CaCl2 solution were favorable hyperosmoticum and hypoosmoticum respectively.     

Establishment and Identification of Cytoplasmic Male Sterility in Brassica napus by Intergeneric Somatic Hybridization

Exploitation of novel cytoplasmic male sterility(CMS)is a main approach for widening the cytoplasmic genetic background of hybrid oilseed rape and avoiding epidemic risk in oilseed rape production.In this study,symmetric somatic hybrids between Brassicanapus var.Zhongshuang4 and Sinapis arvensis(Yeyou18)were produced by protoplast fusion.Two of the six established hybrids were male sterile showing trace or no pollen release upon flowering with non-or slightly extended stamens.Using Zhongshuang4 as a recurrent parent to pollinate the male sterile plants,the ratio of male sterile plants increased with the number of backcrosses.As early as in BC3 generation,most of the sterile families had nearly 100%sterile plants.Up to BC4 generation,the male sterility became stable and no fertility segregation was observed.All F1 progenies from tested crosses using restorer and maintainer lines of Polima CMS were 100%sterile,indicating that the established CMS by somatic hybridization is different from Polima CMS.The origin of the cytoplasm and potential use of this hovel CMS in oilseed rape breeding were discussed.Key wotds:Oilseed rape,Protoplast fusion,Cytoplasmic male sterility,Sinapis arvensis