苏北地区无土栽培营养液盐浓度与电导率的关系

Relationship between Soluble Salt Content in Nutrient Solution and Electric Conductivity in the North Area of Jiangsu Province

以苏北地区的自来水为水源,配制3种不同配方的无土栽培营养液,研究营养液盐浓度与电导率的关系。结果表明:在苏北地区采用自来水为水源的无土栽培营养液盐浓度与电导率呈正相关关系,不同营养液配方条件下营养液剂量与电导率的关系不同,日本园试营养液配方最佳回归方程为y=0.007 2x^3-0.046 3x^2+0.535 2x-0.312(R^2=0.999 9),法国国家农业研究所普及NET之用(1977),通用于好酸性作物配方最佳回归方程为y=0.024 9x^3-0.139 8x^2+0.872 6x-0.501 3(R^2=0.999 9),改良Hoagland营养液配方最佳回归方程为y=0.004 3x^3-0.021 1x^2+0.477 1x-0.327 1(R^2=0.999 9)。

In order to study the relationship between nutrient concentration and electrical conductivity,three kinds of soilless culture nutrient solution with different formula of water supply in the north of Jiangsu Province were made. The results showed that the relationship between the salt concentration and electrical conductivity of the soilless nutrient solution in the north of Jiangsu Province were positively correlated, and the formula of nutrient solution was different.The best regression equation of the Japanese garden nutrient solution formula was y=0.007 2x^3-0.046 3x^2＋0.535 2x-0.312（R^2=0.999 9）, and the best regression equation of the National Agricultural Research Institute of France（1977） for the best acid crop formula was y=0.024 9x^3-0.139 8x^2＋0.872 6x-0.501 3（R^2=0.999 9）, and the optimal regression equation for the modified Hoagland nutrient solution formula was y=0.004 3x^3-0.021 1x^2＋0.477 1x-0.327 1（R^2=0.999 9）.