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Latest insights into water and nutrient control in soilless cultivation

机译：无土栽培中水和养分控制的最新见解

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Transpiration influences transport and translocation of Ca. Nutrition and transpiration are both important in preventing blossom-end rot of tomatoes. Potassium and high EC have positive effects on quality of vegetables. For cut flowers low EC promotes quality. B and Zn toxicity can occur when irrigation water is contaminated by these elements. Zn is released from galvanized steel. Low pH is favourable for crops or varieties susceptible to chlorosis, like gerberas, roses and chrysanthemum. In soilless culture, each crop has its own standard nutrient solution. The composition of the solution is adjusted to the growing period, analytical results of the solution in the root environment, the composition of the irrigated water and that of the drainage water (in recirculation). The area of soilless cultivation in the Netherlands was about 3670 ha in 1992. By the year 2000 the aim is that all cultivation under glass should be closed, recirculating soilless systems.
机译：蒸腾作用影响钙的转运和转运。营养和蒸腾作用对于防止西红柿开花期腐烂都很重要。钾和高EC对蔬菜质量有积极影响。对于切花，低EC可提高品质。当灌溉用水被这些元素污染时，可能会产生B和Zn毒性。锌从镀锌钢中释放出来。低pH值对非洲菊，玫瑰和菊花等易发生绿化的农作物或品种有利。在无土栽培中，每种作物都有其自己的标准营养液。调节溶液的组成以适应生长期，根环境中溶液的分析结果，灌溉水和排水的组成（再循环）。荷兰的无土栽培面积在1992年约为3670公顷。到2000年，目标是封闭玻璃下的所有栽培，并循环使用无土栽培系统。

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