The experiment, in which the optimized regression design was adopted, involving 3 factors, each with 5 leves, were conducted to study the nutrient solution formula for cucumber at Fruit-bearing in Soiless culture. With the aid of computer,the model demonstrating the relationship between yield factor(y) and three element factors the concertration of NKMg were established.The model is as follows:
Y=420.17792+6.68322x1+3.54910x2-6.61654x12-4.58407x22-3.6297x32+6.47500x1X2 Analysis result showe...