烟草移栽期与烟田土壤水分利用关系的研究

研究结果表明，烟草的移栽期与烟田土壤水分的变化动态和有效利用密切相关。在年降雨量比较大的豫中烟区，烟草在５月１日前后移栽有利于提高烟草的水分利用效率、烟叶的产量及产值；在年降雨量比较小的豫西烟区，烟草适宜的移栽期应在５月１～１０日，此期移栽有利于保持旱区烟田土壤水分平衡。无论在豫中还是在豫西烟区，烟田地膜覆盖都能够减少前期烟田土壤水分蒸散，促进烟苗移栽后的早发快长，特别是在豫西干旱地区，烟田地膜覆盖的效果更加明显。

套管咬合桩在徐州地铁新元大道站围护结构中的应用

通过对徐州地铁2号线新元大道站围护结构方案的比选,结合现场特殊的施工条件,阐述了套管咬合桩在具体环境中使用的可行性及主要的施工工艺,可为同类工程施工参考借鉴。

烟草潜叶蛾的药剂防治

１９９３年４～５月在河南省蝇池县进行了８种药剂防治烟草潜叶蛾幼虫的试验。结果表明：８种药剂的平均校正死亡率在施药后２４小时小于３５％，４８小时小于等于５０％，７２小时小于５５％，且各药剂间无显著差异；９６小时有４种药剂的平均校正死亡率达１００％，最低者为７４．４％，且各药剂间差异显著。

Spatial distribution and sampling of larvae of Phthorimaea operculella(Zeller) and its harmfulness

Studies in tobacco fields were conducted in 1993. The results showed that the distribution pattern of the larva was aggregative,and the aggregation did not change with the densities of population of the larva. The characteristics of the vertical distribution of the larva on tobacco plants was more in the lower leaves than in the upper. The difference of population density among the tobacco fields with an elevation of 490 meters and 900 meters was not significant. The number of sampling was given under different precisions by using two-stage sampling technique. The average of leaf area loss caused by the larva in tobacco fields was 12.654 cm2.

试论基层医疗机构的经营管理机制

基层医疗机构的经营管理机制,并不是指管理体制、管理制度和管理措施的设计,而是其经营管理的社会行为。即指从主观过程开始引发的,不以人们的意志转移的客观过程、因果链及其管理效应。