跃进农场小麦早春冻害防御和恢复技术的探讨

根据跃进农场１９９９年小麦１３个品种（系）计３３块田的调查资料,采用逐步回归分析的方法,对冻害严重度与苗情及栽培因素的关系、产量与栽培因素及产量结构的关系、产量及产量结构与冻害恢复的关系等七个方面进行了研究。结果表明：（１）小麦早春严重冻害后及时采取恢复措施夺得高产、须穗、粒、重协调发展,首先应确保高产所需的适宜穗数,并努力提高粒重和每穗实粒数。同时,穗数与冻害严重度密切相关,而产量、每穗实粒数和粒重与冻害严重度无重要相关,冻后恢复良好。（２）冻害严重与品种的春性强弱、播期、总叶片数、冻前Ｐ２Ｏ５用量和冻前肥料用量（纯氮、Ｐ２Ｏ５和Ｋ２Ｏ合计）密切相关,与越冬至冻前Ｐ２Ｏ５用量有不可忽视的重要关系。因此,在“暖压,冻前适当控制肥料投入,越冬至返青适当控氮、增磷,以增强小麦对早春低温冻害的防御能力。（３）小麦早春     

不同地域柞蚕核型多角体病毒特性的研究

探讨了我国不同地域ApNPV的特征性状。试验表明:(1)不同地域的ApNPV对河南柞蚕、蓖麻蚕的致病性有差异;(2)不同地域ApNPV-DNA经EcoRI酶解,电泳图谱相似;使用salI内切酶酶解时,在琼脂糖电泳图谱中的C、G、O、Q、U和P等片段,不同毒株之间有差异;(3)河南云阳株(HY)病毒粒子多肽由16种蛋白亚基组成;病毒DNA为线形环状结构,周长4.76×10~5,计算DNA的分子量为:91.4×10~6道尔顿。     

新疆2家牛场引进安格斯牛的牛病毒性腹泻、牛传染性鼻气管炎和布鲁氏菌病检测

为了解新疆当地牛病毒性腹泻(BVD)、牛传染性鼻气管炎(IBR)和布鲁氏菌病对引进安格斯牛的影响,对2家牛场新引进的和引进2年以上的安格斯牛进行BVD、IBR和布鲁氏菌病病原学和血清学检测。结果显示,新引进的安格斯牛未检测出BVD抗原、IBR病原核酸、布鲁氏菌感染抗体,而引进2年以上的安格斯牛虽未检出BVD抗原,但IBR病原感染抗体阳性率为100%,且PCR核酸阳性率为20%,布鲁氏菌感染抗体阳性率为5%。结果表明,新引进的安格斯牛虽未感染这3种疫病病原,但引进后有较大的感染风险。结果提示,牛场需加强BVD、IBR和布鲁氏菌病防控,实施全群免疫,筛选并淘汰感染牛,坚持自繁自养,慎重从场外引进牛只。     

部分栽培葱属植物叶绿体基因组的RAPD分析

  提取我国栽培的几种主要葱属植物的叶绿体DNA , 利用RAPD 技术进行遗传关系分析。从56 个10 bp 随机引物中筛选出18 个多态性引物进行扩增分析, 14 个材料共扩增出270 条带, 其中246 条具多态性。UPGMA 聚类将供试葱属品种分成4 个组。葱属在进化上存在两个方向, 分别形成了管状叶和扁平叶两种类型。     

牛鼻栓种子的主要化学成分和萌发条件的初步研究

分析了牛鼻栓种子的主要化学万分并对种子的萌发条件进行了初步的探索。结果牛鼻栓咱子含有较高的粗蛋白（３７．７３％）和粗脂肪（３３．８０％）,较低的淀粉（２．５３％）和一糖（２．７５％）,富含钾、钙、镁、铁,锌等矿质１７种氨基酸,具有很高的开发利用价值,实验表明中子有休眠特性,需要一定的低温或层积处理来打破休眠。５０－２００ｍｇ／Ｌ的ＧＡ３,１００ｍｇ／Ｌ的６－ＢＡ和青霉素示有有效打丰休眠,但６－ＢＡ     

几种小红栲变性淀粉的结构特性

目前世界上变性淀粉的年产量已经达到500万t左右,如美国为200万t以上,欧洲为90万t,日本在30万t以上;而我国在2000年变性淀粉的产量为35万t,仅为世界产量的7%,根本无法满足国内109万t以上的市场需求而每年都要从国外进口     

Study on Advanced Treatment of Secondary Effluent Using Fixed-Bed Filled with Bone Char

The adsorption of a fixed bed filled with bone char was investigated in terms of its efficiency and capacity by determining operational conditions for the purpose of further reduction of organic matter and removal of phosphorus using a continuous flow of real secondary effluent. Simultaneous removals of phosphorus and chemical oxygen demand (COD) were sufficiently achieved by this fixed-bed method. Stable performance was maintained even at a linear flow velocity (abbreviated as LV) of 1.5 m h^–1. Appropriate backwashing and regeneration were required to operate the system continuously for a long period of time. During the regeneration, the use of treated water including Ca²⁺ ion was so effective that phosphorus removal efficiency increased from about 50 to 80%, and afterwards maintained over 65%, until inflow water of the volume up to 150 times as large as the volume of bone char had passed through. Even when the inflow water of the volume rose up to 200 times, the phosphorus removal efficiency could be maintained over 50%. During this operation, the adsorptions of phosphorus and COD onto the bone char surface were observed to be over 6.7 and 35 gL^–1, respectively.     

Effect of high temperature heat treatment on pH value of Masson Pine wood

Heat-treated wood has good dimensional stability,corrosion resistance and visual quality,but it is prone to mold,which limits its application.Based on the pH value of heat-treated wood,this study examines the factors affecting the pathogenesis causing heat-treated wood mold.Normally,the pH value of the heat-treated wood is between 4.38 and 5.10,which is suitable for the growth of mold.However,the pH of the heat-treated copper-containing material is between 6.63 and 7.12,which deviates the treated wood from the comfortable growth conditions for the mold,thereby reducing the occurrence of mold.     

大豆性状整齐度与产量的关系

观察测定了同一品种在同一条件下大豆性状的整齐度，同一品种在不同条件下性状的整齐度，不同品种在同一条件下性状的整齐度，统计分析了性状整齐度与实收产量之间的关系，结果表明，要获得大豆高产稳产，应注意植株间荚数和粒数的整齐度。     

预测二化螟的生物学参数和数学模型

本文研究了种植杂交稻后,二化螟的发育历期、积温、期距、繁殖能力、种群生存率和为害量等参数,并组建了预测模型.