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膜下多孔管喷灌,可节水、省工、省地,设备投资小,安装简易,便于维修管理,可降低大棚内的空气湿度,能延缓和减轻黄瓜病害发生,是目前大棚黄瓜较好的灌水方式,有广阔的发展前景。膜下多孔管喷灌,就是通过管道系统将低压灌溉水(以自来水作灌溉水源可不必加压)输送到多孔管灌水带中,灌水带沿畦长方向布置在畦面上,上面覆盖地膜。灌水时在0.2—0.3公斤/厘米~2的工作压力下,水从出水孔中喷射到地膜上,反弹落入作物根际附近的土壤中,被作物吸收利用。下面仅就其布置、安装及管理中的有关问题作一介绍。一、膜下多孔管喷灌系统的组成膜下多孔管喷灌系统通常由水源(井水、河水或自来水)、水泵、过滤器、输水管道、灌水带、水表、闸阀及连接配件组成。输水管道分干管和支管两级。干管为内径40或50毫米、支管为内径25或40毫米的硬质塑料软管,可据灌溉面积、灌水量的大小选用。灌水带为内径25毫米的薄壁多孔软带管。过滤器是灌水系
Under the membrane porous tube sprinkling irrigation, water-saving, labor-saving, land and equipment investment is small, easy to install, easy maintenance and management, can reduce the humidity inside the greenhouse can delay and reduce cucumber disease occurs, is the current greenhouse cucumber better Irrigation methods have broad prospects for development. Under the membrane porous pipe sprinkling irrigation, it is through the pipeline system will be low-pressure irrigation water (tap water for irrigation water may not be pressurized) to the perforated tube irrigation belt, irrigation belt along the longitude direction is arranged on the surface, covered with plastic film. Irrigation at 0.2-0.3 kg / cm ~ 2 under the working pressure, the water jet from the water hole to the ground film, bounced into the soil near the crop rhizosphere, the crop is absorbed. The following only on the layout, installation and management of the related issues to make an introduction. First, the composition of porous pipe sprinkler system Under the membrane porous pipe sprinkler system usually consists of water (well water, water or tap water), pumps, filters, water pipes, irrigation tape, water meter, valve and connection components. Water pipe sub-trunk and branch pipe two levels. Dry pipe diameter 40 or 50 mm, branch diameter 25 or 40 mm hard plastic hose, according to the irrigated area, the size of the amount of irrigation use. Irrigation zone with a 25 mm inner diameter thin-walled porous flexible tube. The filter is irrigation system