樟子松种子败育与形态解剖的研究

1987～1989年对净月潭樟子松种子园种子败育进行形态解剖观察,确定了胚珠、雌配子体,胚败育的形态特征及发生时间和比重。与宏观调查比较研究,得知产生败育的主要原因是养分竞争和授粉不良。     

施田补对打瓜幼苗生理指标的影响

研究了施田补处理后打瓜幼苗的生理指标的变化。结果表明,在深土层,低浓度药剂处理下,打瓜幼苗的叶绿素含量和SOD活性变化与对照相比较差异不显著。因此,生产上灌水淋溶以降低大田浅土层残留施田补浓度,减小对打瓜生长的影响。     

矮牡丹濒危机制分析与保护对策

矮牡丹是中国特有的珍贵种质资源,全国现仅存有六个居群,主要分布于陕西,山西和河南交界的部分山区,居群内数量很少。其种群类型,形态特征,生长习性及濒危状况尚未详细研究报道。调查结果表明矮牡丹现有的生存环境已遭到破坏,生长发育缓慢,自然繁殖能力差。研究分析了矮牡丹在自然界的濒危机制,提出了建立矮牡丹自然保护区,促进自然种群的繁衍,设立人工繁育苗圃等保护措施。这对于保存中国濒危物种资源具有非常重要参考价值,对珍稀濒危植物的保护和合理开发利用具有实际意义。     

蕨菜配子体的生长发育特点

选用成熟的蕨菜孢子播种于基质为母土的培养皿中，观察其生长进程及配子体、幼孢子体的生长速度发现，受精早晚与配子体大小没有直接的关系，而与配子体成熟度即精卵器产生早晚密切相关；受精后配子体（原叶体）由大变小，由绿变黄，由厚变薄，最后死亡，但死亡早晚个体间存在明显差异。     

Effects of azoxystrobin, difenoconazole, polyoxin B (polar) and trifloxystrobin on germination and growth of Alternaria alternata and decay in red delicious apple fruit

Alternaria alternata is the predominant fungal pathogen responsible for moldy-core in red delicious strains of apple. In this study, we report on the effects of the polyoxin B compound Polar, the strobilurin fungicides, azoxystrobin and trifloxystrobin, and the sterol inhibitor difenoconazole on spore germination, mycelial growth and fruit decay on detached fruits caused by A. alternata. Germination was most sensitive to polyoxin B and trifloxystrobin among the tested compounds. The 50% and 95% effective concentration (EC₅₀, and EC₉₅), values for in vitro inhibition of conidial germination of the fungus were lowest for polyoxin B and trifloxystrobin, ranging from <0.01 to 0.15 μg/ml and 180 μg/ml, respectively. Germination was least sensitive to difenoconazole and azoxystrobin (EC₅₀ and EC₉₅ values ranging from 25 to 72 μg/ml and 720 μg/ml, respectively). Mycelial growth in vitro of A. alternata was most sensitive to difenoconazole (EC₅₀ and EC₉₅ values of 0.8 and 12 μg/ml, respectively) and least sensitive to both strobilurin fungicides (EC₉₅>1000 μg/ml). Decay formation by A. alternata on mature detached fruits was most affected by trifloxystrobin and azoxystrobin (EC₅₀ and EC₉₅ values of 0.015–0.087 μg/ml and 8 μg/ml, respectively), intermidiate in sensitivity to Polyoxin B (EC₅₀ and EC₉₅ from 1 to 33 μg/ml, respectively), and difenoconazole was the least effective (EC₅₀ and EC₉₅ from 20 to 490 μg/ml, respectively). Polyoxin B applied at 24 or 48 h post-inoculation inhibited fruit decay development. Difenoconazole and trifloxystrobin were less effective and azoxystrobin was ineffective when applied at 48 h post inoculation. The activity of azoxystrobin, difenoconazole, Polyoxin B and trifloxystrobin on one or more stages of the life cycle of A. alternata and on decay development in fruits suggests that these compounds potentially could provide control of moldy-core disease in apple.     

风味苔干的研制与应用

通过对苔干进行相应的浸泡与参数优化、香辛料油炸参数确定、风味苔干配方的筛选等,并进行真空包装和巴氏杀菌,生产出开袋即食,风味多样,方便休闲、色香味俱佳的食品,同时制定出特色风味苔干系列食品的加工程序与方法的技术要求及标准。     

玉米新品种莱早1号的选育

莱早1号系F108和Mt两个自交系配制而成的极早熟玉米一代杂交种。生育期87d,鲜穗采收期70d,具有抗倒、丰产、抗病、耐低温、优质和适播期长的特点,平均鲜穗产量12675kg/hm2,成熟干子粒产量5325kg/hm2,适宜种植密度为75000株/hm2,可作为鲜食玉米品种进行春播或夏播。     

基于Var模型的我国农业利用外资对农业政策依赖度衡量分析

在Var模型的基础上,通过协整分析,脉冲响应和方差分解的方法对我国农业利用外资与农业政策、前一期农业发展水平的关系进行了全面研究。结果表明:农业利用外资与农业政策、前期农业发展水平之间存在长期动态均衡关系,且农业利用外资规模对内部因素即农业发展水平的依赖度是61%,对外部因素即农业政策的依赖达到31%;农业政策冲击对农业利用外资波动有较强解释能力,政策环境是影响农业利用外资规模的重要因素,当农业经济不景气时,通过农业政策调整,可有效抑制外资从农业中流走。在此基础上,就我国农业利用外资比重极小的现状,提出扩大农业利用外资规模的政策建议。     

用可编程控制器(PLC)实现电压和无功功率的自动调整

本文以天津无嘴35kV变电站为例，详细介绍了PLC在供电系统中使用的优越性及具体实现方法。以供同行专家参考及交流。     

河南太行山南方红豆杉种子催芽研究

应用变温层积和激素处理,探讨打破太行山南方红豆杉种子休眠的技术。结果表明,高温处理时间与红豆杉的裂口数呈正相关;激素处理对种子萌发有明显促进作用;低温处理并非是种子裂口的必要条件。