关中地区危害杨树叶部的蛾类区系及其防治适期的模糊预测

本文论述了关中地区杨树食叶蛾类的区系结构,并从生态学角度出发,运用模糊分析方法,阐明了下旬/5月～中旬/6月,下旬/7月～中旬/8月为防治适期。     

蜂王幼虫发育期食物量变化的研究

蜂王幼虫的生长发育会受到遗传、生长环境、营养物质等因素的影响.工蜂直接饲喂蜂王浆是影响蜂王个体发育的重要因素之一.在蜂王幼虫期发育过程中,工蜂供给的食物是蜂王浆,观测发现:不同日龄的幼虫王台内的蜂王浆量变化不同.在幼虫期的0～60h,1日龄幼虫王台内的蜂王浆量比2日龄幼虫少;60～84h时,情况相反.     

文化整合模式在企业文化整合过程中的应用

企业在文化整合过程中因价值理念和管理风格等文化上的差异引发的激烈冲突导致的企业整合失败屡见不鲜。应用何种文化整合模式解决文化冲突,促进文化融合成为文化整合过程中的难点。本文以华菱集团为例通过分析华菱集团文化整合各个不同阶段所采用的文化整合模式来探索一条企业集团并购重组后文化整合的基本途径。     

柑桔开花,幼果期的异常高温胁迫对叶片光合作用的影响

研究了柑桔花期、幼果期的异常高温胁迫对柑桔叶片光合速率的影响。受异常高温的突然袭击后，柑桔叶的光合速率迅速大幅度下降。较高的大气相对湿度能很大程度上抵消短期高温的效应，但对较长时间的高温作用不大。高温对叶光合速率的影响，短期内主要通过气孔限制ＣＯ２供应量来实现，随后较长时间内主要通过抑制叶肉细胞的光合活性来实现、经较长高热环境的影响后，叶片的光合速率会产生适应性的恢复，使光饱和点、光补偿点、最适温度及适宜温度范围等产生明显的变化。     

Changes of Surface Potential and Phospholipid Composition of Winter Wheat Callus Cells Grown at 5 and 25 °C

Water stress was imposed by cessation of watering (CW) on bread wheats and, in some experiments two spelt wheats, during 9–17 days, starting at the 4–5 leaves stage. Main shoot foliar stages (MSS) were delayed by CW and the effect remained thereafter.
The presence of side tillers (intact or partly destroyed by heat or potassium iodide (KI) was not beneficial to main shoot foliar development after the end of CW. Emergence of tillers after the onset of CW was also delayed, but the effect was small if timing was expressed in MSS. Secondary tillers were the most sensitive to water shortage, their number, size and foliar stage were drastically reduced.
The two cultivars of spelt wheats were not less sensitive to CW than the bread wheat tested.     

Pilot Study of Drought Resistance for Maize at Budding Stage

The drought resistances of 44 maize germplasms at budding stage were studied with 19.2% polyethylene glycol(PEG-6000)in order to provide new germplasm resource for drought resistance breeding of maize.The results showed there were five extremely high drought resistance germplasms,20 germplasms with high drought resistance,and 19 germplasms with medium drought resistance.The significance testing was also used to demonstrate that the germination index(GI)and germination of drought resistance index(GDRI)of N4,N54-1 and Wuming No.1 were dramatically remarkable than others.The conclusion was that the 44 maize germplasm had good drought resistance and could be used as germplasm resource of the drought resistance breeding of maize,which had a great value of development and utilization.     

水稻旱育机插秧不同播期对安全齐穗的影响

应用旱育秧方式,采用随机区组设计,研究水稻机插秧在不同播期处理条件下,对油茬稻水稻机插用秧的适宜播种期及安全齐穗的影响。结果表明:在本试验条件下,油茬稻机插用秧在4月上旬至中旬播种移栽,8月中、下旬月平均温度达23℃以上,即可保证安全齐穗,且能获得较高产量。     

水资源利用阶段划分及特征分析

采用生态和社会经济二类用水指标将水资源利用阶段划分为生态安全、生态临界-农业增长、生态临界-工业增长、生态破坏-农业增长、生态破坏-工业增长和生态恢复6个阶段。分析不同阶段的社会经济和生态环境形态和特征,以确定未来流域或区域水资源利用走势。对全国水资源二级区2000年所处的水资源利用阶段进行划分,分析了不同阶段水资源与社会经济指标变化特征和不同阶段与上下游和气候分区的关系。     

甜菊实生苗春栽丰产模式初探

应用田间正交试验，探索甜菊实生苗春季的丰产模式，实现了多种增产因素的优化配置。在中肥力轻壤质潮土、汕菜掩青、满足水肥供应条件下，栽培“邯选１号”甜菊实生苗，２．８万株６６７ｍ＾２、４密１稀，开沟定植，地膜覆盖、２捋１割为最佳组合，干叶产量可达４３６ｋｇ／６６７ｍ＾２。该模式可供１ａ生类型区春栽甜菊实生苗时参考。     

水稻增产素的应用效果试验

两年大区试验结果表明:在水稻返青期与返青肥一起施入水稻增产素1kg/667m2,分蘖期再施入0.5kg/667m2,可使空育131增产10%,上育增产24.5%,特别是在低温年施用效果更明显。试验是在两年、两个品种、15hm2的大面积上进行的,结果具有一定的代表性,可大面积推广。