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了降低成本提高效益,应依据作物种类、栽培目的,选择适宜厚度、颜色、性质的农膜,还应掌握一定的监测和保养知识。一、常用农膜的鉴别。当前用于农业生产的农膜主要有两大类,即聚氯乙烯薄膜和聚乙烯薄膜。可根据它们各自的特性加以区别。 1.聚氯乙烯农膜:手感柔软、发粘;比水重,入水下沉;拉长后能迅速复原;用火烧之有黑色浓烟和刺鼻臭味,火焰呈绿色,离火即灭。 2.聚乙烯农膜:手感较脆、滑润;比水
To reduce costs and improve efficiency, should be based on crop types, cultivation purposes, choose the appropriate thickness, color, nature of the plastic sheeting, but also should have some knowledge of monitoring and maintenance. First, the identification of common agricultural film. There are two main types of agricultural film currently used for agricultural production, namely, polyvinyl chloride film and polyethylene film. Can be distinguished according to their respective characteristics. 1. PVC plastic sheeting: soft, tacky; heavier than water, sink into the water; can be quickly restored after stretching; with black smoke and pungent smell of fire, the flame is green, off from the fire . 2. Polyethylene plastic sheeting: feel crisp, smooth; than water