果树流胶防治有新法

果园用生石灰粉对桃、各、李、樱桃等果树的流胶进行防治,效果明显,治愈率可达100%。该法具有省工、省钱、方法简单的优点其操作要点是:1时间防治果树流胶的最佳适期为果树树液开始流动时此时流胶正处于始发期,及时防治后不影响果树养分消耗。     

黄瓜流胶病害的诊断及防治技术

黄瓜生产,尤其是保护地栽培,植株发病后常见流胶的现象。黄瓜茎蔓流胶后,其上方逐渐萎蔫直至死亡；瓜条流胶后,其商品性差,甚至出现畸形或软腐而无食用价值。轻者减产20％～30％,重者绝产,严重影响瓜农的经济效益。流胶是黄瓜叶片的光合产物,是黄瓜生长所必需的营养物质。植株发病后,韧皮部的输导组织被切断,导致光合产物溢出而产生流胶。现将常见的几种黄瓜流胶病害的诊     

如诗如画的晓起村

清代婺源人齐彦槐有一首描写村居的诗，诗中云：“古树高低屋，斜阳远近山；林梢烟似带，村外水如环。”到过晓起村的人都说，齐氏的诗与下晓起的村落环境，竟“绝妙何图诚若是”。     

熵产生原理和耗散结构

本文讨论了熵产生原理和耗散结构理论的基本概念和有关问题,以及上述理论在生物学中的应用。     

山鸡巴氏杆菌病诊断及防治

山鸡巴氏杆菌病诊断及防治高洪伟许星华苏双毕秀纯高淑华胡桂英（吉林省兽医科学研究所·长春·１３００６２）（长春市农业科学院吉林省某国营鹿场饲养山鸡１０００余只，于１９９６年５月突然发病，经实验室诊断，确诊为巴氏杆菌病，使用盐酸环丙沙星治疗很快控制了疫情...     

建设新农村的重要举措:加强村级班子建设,努力推进依法治村

认真解决好依法治村问题,是建设新农村的重要举措。本文试从加强村级班子建设的角度,探讨新农村建设,推进依法治村的一些问题。     

野外风沙流结构的定量研究

在对野外风沙流进行实测的基础上，定量地考察了２０ｃｍ高度层内的风沙流结构特征及分布规律。     

流水池培育二龄草鱼种试验

每个面积约30平方米的流水池共38个,每平方米放养草鱼种38尾。采取曝气增氧、排污换水,提高流水池的溶氧量,以及投喂精料,防治鱼病的措施,获得每平方米生产二龄草鱼种15.41公斤的成绩。     

可控止回阀水力特性的测试研究

本文运用水流相似原理，对可控止回阀的流阻系数曲线和动水力矩，进行了系统的水力模型试验研究，为该阀的节能效益和技术开发的可行性，提供了必要的科学依据，其流阻系数值为０．１９，优于液控蝶阀。     

Sediment Load in Runoff Under Laboratory and Field Simulated Rainfall

Soil erosion is one of the most important problems in the Loess Plateau of China affecting sustainable agriculture. Near Luoyang (Henan Province, China), field plots were constructed to measure soil erosion rates under conventional tillage practices using field-simulated rainfall.Field rainfall experiments were carried out to compare previous results from laboratory rainfall simulations on the same soil for interrill conditions. Although in the laboratory experiments, a strong correlation was found betweenthe stream power of the runoff water and the unit sediment load, this sediment transport equation overestimated the field rainfall simulation results. Another sediment transport equation derived by Nearing et al. for rill erosion was in better agreement with the results of the field experiments, although it also overestimated these values. The measured sediment load values during the field rainfall simulations were also lower than those found during field experiments on the same soil but with a loosened surface layer. This difference indicates the importance of soil physical condition of surfce like soil structure and aggregate size, which may contribute to the discrepancy between the field and laboratory experiment results.