Development of ion control system of nutrient solutions for preservation of environment and high quality production

开发了一种名为IonAdjuster的计算机软件程序，用于帮助营养液中的常量营养素混合，根据用户指定的需求和当前的分析结果，从各种营养源中选择最佳组合，以确定所需的添加率。“离子调整器”根据所需成分的差异和溶液中目前的常量营养素浓度来确定要添加的浓缩液的量。在果蔬水培栽培实践中，按“离子调整器”原则添加营养液，可减少溶液离子含量波动，提高上品率。相反，在传统的EC控制方法中，每个离子的浓度波动很大，这意味着在培养后期它与初始值有很大的变化，离子平衡也发生了破坏。在营养液培养中，pH值照常逐渐下降，但在离子浓度控制方法中加入pH稳定程序可以解决这一问题。有人认为，“离子调节器”和自动离子感应相结合，可以适当和连续地控制密闭水培中的溶液。通过减少开放式水培系统更新时产生的营养液废液，这种开发的系统可以提高作物产量，更有效地利用肥料，并减少环境负荷。

A computer software program for aiding the mixture of macronutrients in nutrient solutions, named "IonAdjuster", has been developed to select the best combination from various nutrient sources to determine required addition rates, according to user-specified demand and current analysis results. "IonAdjuster" determines the quantity of concentrated stock solution to be added from differences in required composition and the present macronutrient concentrations in solution. In practical hydroponic culture of fruit vegetables, fluctuation of ion contents of the solution was decreased and the percentage of top-grade fruit increased by the nutrient stock addition according to "IonAdjuster". On the contrary, in the traditional EC control method, each ion concentration greatly fluctuated, this meant it shifted considerably from the initial value in the later stage of cultivation, and the ionic balance also collapsed. The value of pH decreased gradually as usual in the nutrient solution culture, however, adding the pH stabilization routine to the ion concentration control method could solve it. It was assumed that the combination of "IonAdjuster" and automatic ion sensing, might allow for appropriate and continuous control of solutions in closed hydroponics. This developed system may result in higher crop production, more efficient use of fertilizer and environmental loading reduction by decreasing waster nutrient solution at renewal from open hydroponic systems.