水质与营养液的配制有紧密亲密关系。水质尺度的首要指标是电导度（ec），ph值和有害物质含量是不是超标。
Water quality is closely related to the preparation of nutrient solution. The primary indicators of water quality scale are conductivity (EC), pH value and whether the content of harmful substances exceeds the standard.
电导度（ec）是溶液含盐浓度的指标，凡是用毫西门子（ms）暗示。各类作物耐盐性分歧，耐盐性强的(ec=10ms)如甜菜、菠菜、甘蓝类。耐盐中等(ec=4ms)，如黄瓜、菜豆、甜椒等。无土栽培对水质要求严酷，尤其是水培，因为它不象土栽培具有缓冲能力，所以很多元素含量都比泥土栽培许可的浓度尺度低，不然就会发生迫害，一些农田用水纷歧定合适无土栽培，搜集雨水做无土栽培，是很好的方式。无土栽培的水，ph值不要太高或太低，因为一般作物对营养液ph值的要求从中性为好，若是水质自己ph值偏低，就要用酸或碱进行调整，既华侈药品又费时费工。
Conductivity (EC) is the index of salt concentration in solution, which is usually implied by millisiemens (MS). All kinds of crops have different salt tolerance, and those with strong salt tolerance (EC = 10ms), such as beet, spinach and cabbage. Moderate salt tolerance (EC = 4ms), such as cucumber, kidney bean, sweet pepper, etc. Soilless cultivation has strict requirements on water quality, especially hydroponic cultivation, because it does not have buffer capacity like soil cultivation, so the content of many elements is lower than the concentration scale allowed by soil cultivation, otherwise persecution will occur. Some farmland water use is different and suitable for soilless cultivation. Collecting rainwater for soilless cultivation is a good way. The pH value of water for soilless cultivation should not be too high or too low, because the requirements of general crops for the pH value of nutrient solution are better from neutral. If the pH value of water quality is low, it should be adjusted with acid or alkali, which is not only a waste of drugs, but also time-consuming and labor-consuming