Figure 10

Response surface analysis of Chinese chives quality to soil nutrients. (a) Effect of interaction between the available P (X1) and total P (X2) content on the soluble sugar content (Y1). (b) Effect of interaction between the available P (X1) and total P (X2) content on the flavonoid content (Y2). (c) Effect of interaction between the available P (X1) and total P (X2) content on the total phenol content (Y3).