保护地蔬菜栽培中,因棚室内通风较差,氨气、亚硝酸气、二氧化硫等有害气体易在室内积累,严重时会产生气害,影响蔬菜的产量和品质。现将温室大棚常见气害的发病原因,症状和预防措施介绍如下: 一、氨气危害氨气中毒是保护地最常见的一种生理性病害。主要由于所施的氨态氮肥和未腐熟的厩肥、人粪尿、生鸡粪和饼肥等或一次性施氮肥量过大、表施成覆土过薄都会产生大量氨气,加剧氨的挥发,造成蔬菜的氨气中毒。氨气中毒主要危害蔬菜的叶片和花。叶片受害时,初期呈水渍状、随后叶尖、叶缘干枯、下垂、重者全株叶片迅速干枯。花受害后,化萼、花瓣呈水 Protected vegetable cultivation, due to indoor ventilation ventilation poor, ammonia, nitrous acid gas, sulfur dioxide and other harmful gases easily indoors accumulation, serious gas will produce, affecting the yield and quality of vegetables. The common causes of greenhouse gas greenhouse disease, symptoms and preventive measures are as follows: First, the ammonia hazard Ammonia poisoning is the most common protection of a physiological disease. Mainly due to the implementation of the ammonia nitrogen and non-maturity of the manure, human waste, raw chicken manure and cake fertilizer, or a one-time application of nitrogen is too large, the table is too thin overburden will produce a lot of ammonia, exacerbating ammonia volatilization, Ammonia poisoning caused by vegetables. Ammonia poisoning is a major hazard to the leaves and flowers of vegetables. Leaf damage, the initial water-like, followed by tip, leaf margin dry, drooping, severe whole plant leaves rapidly dry. Flower damage, calyx, petals were water