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近年来,蔬菜的营养液膜栽培作为水培的重要形式,获得了相当规模的发展。营养液膜栽培用水,无疑用天然的雨水、自来水、河水等软水较为理想。但是,在现在已推广的23个省、市、自治区中,用的却是以深井水为主的硬水。硬水PH值偏高,通常在8以上;含有过多的K~(+1)、Na~(+1)、Ca~(+2)、Mg~(+2)、Fe~(+2)、Cl~(-1)、SO_4~(-2)、HCO_3~(-1)和NO_3~(-1)离子;矿化度也高,通常在1000以上。这些过多的离子,对栽培无用甚至有害,而且含量又不稳定。为了推广蔬菜营养液膜栽培配套技术,扩大生产规模,特进行不同水质的营养液膜栽培对比试验。
In recent years, nutrition liquid film cultivation of vegetables as an important form of hydroponics, access to a considerable scale of development. Nutrient liquid membrane cultivation of water, no doubt the use of natural rainwater, tap water, rivers and other soft water is more ideal. However, in the 23 provinces, municipalities and autonomous regions now popularized, the hard water used mainly in deep well water is used. The pH value of hard water is high, usually over 8, containing too much K ~ (+1), Na ~ (+1), Ca ~ (+2), Mg ~ (+2), Fe ~ (+2) Cl ~ -1, SO_4 ~ (-2), HCO_3 ~ (-1) and NO_3 ~ (-1). The salinity is also high, usually above 1000. These too many ions are useless or even harmful to the cultivation, and the content is not stable. In order to promote vegetable nutrition liquid membrane cultivation supporting technology, expand production scale, special for different water quality nutrition liquid membrane cultivation contrast test.