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两位芬兰发明家和一个瑞典人,已就一种地下灌溉系统申请了一项英国专利(专利号为2125924)。该专利的目的是从地下对植物根部供水。因在热天进行地面喷灌时,大部分水将由于蒸发而浪费掉。在地下敷设多孔管道来灌水的设想早就有了,其缺点是出水的孔口常被污物或杂质堵塞。取得专利的新结构,是将一种双层水管埋在地表下,这种管子的外层加
Two Finnish inventors and one Swede have applied for a British patent for an underground irrigation system (Patent No. 2125924). The purpose of this patent is to supply water to roots of plants underground. Most of the water will be wasted due to evaporation due to ground sprinkler irrigation on hot days. The idea of laying porous pipes underground for irrigation has long existed, with the disadvantage that the outlet of the effluent is often clogged with dirt or impurities. The patented new structure is to bury a double pipe under the surface of the earth,