园林植保工作不容忽视

园林植物病虫害是制约园林绿化事业可持续发展的重要因素之一。分析了近年来太原市病虫害发生和危害趋重的原因，针对太原市园林植保工作中存在的问题。提出防治病虫害、搞好植保工作的措施和建议。     

农产品的价格和需求对无公害植保技术使用的影响

分析了影响无公害植保技术使用的因素,从生产者具有追求利润最大化的动机入手,建立了农产品价格和需求对无公害植保技术使用的分析模型。得出了农产品在各种需求状况下支持使用无公害植保技术所必须具有的价格;提出了推广使用无公害植保技术若干建议措施。图3,参14。     

克拉玛依景观审美价值评价初探

基于3S技术和景观生态学理论,利用层次分析法,在获取克拉玛依不同时期景观数据后,试图在景观指数的基础上,对克拉玛依多期景观进行审美价值评价.结果表明,克拉玛依多期景观审美价值逐年提高,克拉玛依生态环境虽然有所改善但现状依然严峻.     

AT试剂对春茶光合生产的调控研究

应用ＡＴ试剂处理春茶，能提高越冬留养叶的光合速率，加速光合产物输出，增加叶片叶绿素含量，增加新梢的干物质积累。ＡＴ试剂在提高光合速率的同时，还使硝酸还原酶和过氧化氢酶活性下降。     

Plant growth stimulation by inoculation with symbiotic and associative rhizosphere microorganisms

SelectedRhizobium bacteria, arbuscular mycorrhiza-forming (AM) fungi and associative bacteria have been shown to stimulate the growth of legumes, gramineae and cruciferae in field experiments on different soil types in temperate regions. A combination of microorganisms with different metabolic capacities (N₂-fixation, P-mobilization; production of phytohormones and antibiotics) can partly surpass the effect of single inoculations, or can produce a positive effect where single inoculations are ineffective. Growth stimulation by inoculation requires microorganisms with phytoeffective metabolic characteristics and the ability to survive in the rhizosphere during the growth period. Another prerequisite is an adequate supply of plant assimilates for the production of microbial phytoeffective metabolites. Type of inoculum, method of inoculation and agricultural measures can influence the effect of the inoculation. Research is necessary to extend our knowledge both of basic principles, and about using microorganisms in practice.     

全程序微波辐射制备高等植物SEM样品的研究

本文以五种豆科植物和一种禾本科植物为材料，较为详细地研究和摸索了全程序微波辐射制备高等植物扫描电镜（ＳＥＭ）样品的条件和方法。结果表明。几种植物均能通过全程序微波辐射（包括半程序微波辐射）制得理想的ＳＥＭ样品。微波辐射制样的适宜条件为：固定、脱水、置换时的浸泡液终止温度３０±２℃，干燥终止温度７０±３．℃干燥时间３一一４ｍｉｎ。     

积分惯性型对象的时间和燃料综合最优控制

本文应用庞特里雅金最小值原理,得到积分惯性型对象的时间和燃料综合最优控制的必要条件,求得了不同初始点情况下的最优控制作用,得到了以性能指标中加权系数ρ和对象参数κ、T为参变量的切换线方程,综合了作为状态变量函数的最优控制律u(x_1,x_2)作出了最优控制器和闭环系统的方框图。     

Growth,development, feeding preference,and food consumption and utilization by tobacco hornworm on tobacco mosaic virus-infected and non-infected tobacco leaves

Summary Plant disease may cause a variety of changes in plants which influence their suitability to insect herbivores. The reported physiological changes in tobacco due to infection by tobacco mosaic virus have the potential to influence the feeding, growth and behavior of the tobacco hornworm,Manduca sexta. However, feeding on foliage of systematically infected plants had no statistically significant effects on development time, mean pupal weight or the amount of foliage consumed by 4th instars. Although an initial preference was exhibited by larvae for healthy leaves after about 72 h no differences were observed. These results do not support the results of previous research on the influence of tobacco mosaic virus-infected plants on the tobacco hornworm.Scientific contribution No. 8130, article No. A-5071, of the Maryland Agricultural Experiment Station, Department of Entomology     

硫酸系统LD型电除尘器的运行与改进

介绍了11万t／a硫酸系统LD型电除尘器的结构、运行和改进情况，分析了烟气温度超温、烟气成分失控、电场压力变化等对电收尘器的影响，提出了针对性的控制措施，并根据实际情况对部分设备进行了改进。