Please outline the composition principles for ascertaining a nutrient solution formula.
请简要说明在确定营养液配方时的组成原则。
The suitable nutrient solution formula was calculated according to the water quality in Beijing.
根据对主要大量元素的实际吸收情况，推算网纹甜瓜合适的营养液配方。
The suitable nutrient solution formula was calculated according to the water quality in Beijing.
根据对主要大量元素的实际吸收情况，推算网纹甜瓜合适的营养液配方。
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