杀菌剂银泰防治小麦纹枯病研究

采用室内离体平皿法和田间小区试验测定了植物源农用杀菌剂银泰 (有效成分 :4 -丁酰基苯酚 )对小麦纹枯病菌 Rhizoctonia cerealis生长的抑制作用和对该病害的防治效果。结果表明 ,20%银泰乳油在 0～ 100μg/mL范围内随着浓度提高对小麦纹枯病菌的抑制作用增强 ,其 EC50 和 EC95分别为 36.11和 97.66μg/L;EC95明显小于对照药剂井冈霉素的检测数值 (327.6 4μg/L )。20%银泰乳油 200、400和 800mg/L防治小麦纹枯病的效果分别为 85.8%、89.3%和 92.3% ,与对照药剂甲基硫菌灵 400mg/L的防效 (87.0% )相当。     

河北省薄罗藓科植物分类的初步研究

报道了河北省薄罗藓科植物6属共12种（含1变种），其中中国新记录种1种：北方假细罗藓Pseudoleskeella papillosa(Lindb.)Kindb.；河北省新记录属2属：薄罗藓属Leskea Hedw.和褶藓属Okamuraea Broth.；河北新记录种7种：薄罗藓Leskea polycarpi Hedw.，细枝藓Lindbergia brachyptera(Mitt.)Kindb.，细枝藓疣齿变种L. brachyptera var.austinii (Sull.)Grout.,阔叶细枝藓L. brevifolia(Gao)Gao，瓦叶假细罗藓Pseudoleskeella tectorum(Brid.)Kindb.,褶藓O.hakoniensis(Mitt.)Broth.和短枝褶藓O.brachydictyon(Card.）Nog..本文根据标本编制了河北省薄罗藓科植物分属、种检索表，简要讨论了其生境行理分布特点。旨在为河北省乃至中国苔藓植物的系统研究及苔藓植物资源的开发利用提供可借鉴的资料。研究标本保存在河北师范大学植物标本室（HBNU)。     

禾谷镰刀菌接种小麦幼芽及致病力鉴定的初步研究

 由镰刀菌引起的赤霉病是危害小麦、大麦、燕麦、黑麦等禾谷类作物的一种重要病害,广泛分布于世界温暖潮湿地区。在我国赤霉病发病区,禾谷镰刀菌(Fusarium graminearum Schwabe)是主要致病菌。     

植酸酶对0～3周樱桃谷鸭生长性能、钙、磷表观存留率影响

为了在负对照组 (钙、磷水平各减少 0 .1 % )日粮基础上添加植酸酶对肉鸭生长、钙、磷表观存留率的影响 ,用 64只 1日龄樱桃谷鸭进行试验 ,按体重随机分为 4组 ,代谢期 6天。试验组鸭分别添加植酸酶 30 0和 50 0PU/kg。结果表明 :添加植酸酶显著提高试鸭的日采食量、日增重、钙、磷的表观存留率 ,植酸酶可以部分替代磷酸氢钙     

高山红景天新病害根腐病的分离鉴定与致病性研究

作者在辽宁省东部地区发现,从长白山引种栽培的高山红景天(Rhodiola sachalinensis A.Bor)根茎腐烂严重,蔓延迅速。1—2年生植株发病率为30％—40％,3—4年生植株死亡率高达80％—90％。目前国内外还没有对该植物病害的研究报道。本研究从辽宁省东部山区引种区采集标样进行病原菌分离鉴定和致病性测定,结果报道如下。     

水稻主要病虫综合治理效益评估方法

水稻主要稻虫综合治理是一个多输入输出的管理系统，作者层次法引入水稻病虫综合防治效益评估研究。采用专家咨询、数学分析等手段建立了水稻病虫综合防治效益评估层次模型，对总目标、亚目标、准则，指层要的权重值进行科学评估，并对指标层各个要素建立定量化方法，从而建立了一整套综合防治效益定量评估方法，通过对４个综合防治点１９９２－１９９３年早、晚委的综合防治总体效益进行评估，评估结果基本客观地反映了当前水稻ＩＥ     

小麦离体叶段鉴定白粉病抗性方法的研究

１９９０年４月至１９９４年４月对小麦离体叶段鉴定白粉病抗性方法进行了研究。结果表明：（１）在灭菌条件下，以在培养皿中垫两层滤纸，用６ＢＡ作保绿主，超过人主至进行鉴定效果较好。（２）保绿剂的浓度低，发病快、退绿早，反之反病慢、退绿晚。其最适浓度是：苗期６ＢＡ为６０－１００ｐｐｍ、苯咪唑为６０ｐｐｍ ；成株期６ＢＡ以８０－１５０ｐｐｍ为佳。（３）份病快、退绿迟的角度出发，鉴定材料以株龄小、叶龄短的初展     

Fermentation substrate and dilution rate interact to affect microbial growth and efficiency

The effect of dilution rate (D) on carbohydrate, fibrous and nonfibrous, and protein fermentation by ruminal microorganisms was studied using a single-effluent continuous-culture system. The diets of fibrous carbohydrate, nonfibrous carbohydrate, or protein were formulated with soybean hulls (FC), ground corn (NFC), or isolated soy protein (PR) as the primary ingredient, respectively. Six dilution rates (.025, .050, .075, .10, .15, and .20/h of fermenter volume) were used. Digestibilities of DM, OM, and CP for the three diets and of NDF and ADF for the FC diet decreased (P<.001) as D increased, although the response of the digestibility to D varied with diet. Increasing D resulted in an increase in pH (P<.001) and a decrease (P<.001) in ammonia concentration. Daily volatile fatty acid production increased (quadratic; P<.01) for the FC and NFC diets, but decreased (quadratic; P<.001) for the PR diet. Increasing D quadratically increased (P<.001) the molar percentage of acetate and propionate, but quadratically decreased (P<.001) butyrate and valerate for the FC and NFC diets. For the PR diet, the molar percentage of propionate and valerate increased (quadratic; P<.01), whereas acetate and butyrate decreased (linear; P<.001) in response to increasing D. Molar percentage of isobutyrate and isovalerate decreased (P<.01) with increasing D for all three diets. As D increased, daily microbial N production showed quadratic responses with maximum values achieved at .126, .143, and .187/h D for the FC, NFC, and PR diet, respectively. There was a positive correlation between microbial growth efficiency (MOEFF) and D. A quadratic model fit the data of MOEFF as affected by D, and maximum MOEFF of 37.3, 59.6, and 71.4 g of bacterial N/kg OM truly fermented were calculated to be achieved at .177, .314, and .207/h D for the FC, NFC, and PR diet, respectively. Dilution rate significantly influenced the ruminal microbial fermentation of fibrous and nonfibrous carbohydrates and proteins, and was positively related to microbial yield and growth efficiency. In addition, microbial nitrogen composition, and therefore efficiency, was affected by substrate fermented.     

关于皆伐的思考

本文从景观层次上对皆伐的应用进行了分析 ,得出皆伐是森林主伐的一种行之有效的方式。在森林主伐中 ,应根据立地条件和景观格局 ,恰当考虑皆伐的应用。     

乌骨鸡的研究进展及产品开发

论述了我国乌骨鸡的研究现状及其产品开发情况 ,旨在促进乌骨鸡养殖业的发展