一、绪言用旋转喷雾器喷施大小均匀的药滴,从而降低喷药容量,为杂草防除创立了十分振奋人心的前景。但也产生了一些严格的研究范围问题。严格说来,研究规划必须考虑研究下列各种因素在生物学特性方面的影响;如喷药容量、药滴大小、剂型、除草剂剂量以及杂草和作物的大小和形态。所有这些因素以及它们之间的相互影响和环境的影响,都须按每一种除草剂分别加以认真研究。我们不应该指望会有任何两种除草剂将对这种 I. INTRODUCTION The use of rotary atomizers to dispense uniformly sized drops of medicine reduces the volume of the spray and creates a very exciting prospect for weed control. But there are also some strict issues of scope. Strictly speaking, the research program must consider the biological effects of various factors such as spray volume, droplet size, dosage form, herbicide dose, and weed and crop size and shape. All of these factors, as well as their interplay and environmental impact, must be carefully studied separately for each herbicide. We should not expect any two herbicides to be on this