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. 2018 Oct 25;13(10):e0206285. doi: 10.1371/journal.pone.0206285

Fig 1. Effect of N, P, and K fertilizers on yield and yield components.

Fig 1

a. Effects of N, P, and K fertilizers on yield when N(X1) was within (-1.68, 1.68), Y = 2,306.85 + 113.22X1−104.14X12. When P(X2) was within (-1.68, 1.68), Y = 2306.85 + 96.50X2−74.09X22. When K(X3) was within (-1.68, 1.68), Y = 2306.85 + 129.66X3−99.92X32. b. Effects of N, P, and K fertilizers on pods per plant. When N(X1) was within (-1.68, 1.68), Y = 25.81 + 2.61X1−1.06X12. When P(X2) was within (-1.68, 1.68), Y = 25.81 + 0.99X2−0.91X22. When K(X3) was within (-1.68, 1.68), Y = 25.81 + 1.57X3−2.07X32. c. Effects of single-factor N, P, and K fertilizer on the seeds per pod. When N(X1) was within (-1.68, 1.68), Y = 13.34–0.27X1 + 0.11X12. When P(X2) was within (-1.68, 1.68), Y = 13.34–0.15X2−0.19X22. When K(X3) was within (-1.68, 1.68), Y = 13.34–0.44X3−0.15X32. d. Effects of N, P, and K fertilizers on 100-seed weight. When N(X1) was within (-1.68, 1.68), Y = 6.51 + 0.36X1 + 0.06X12. When P(X2) was within (-1.68, 1.68), Y = 6.51–0.11X2 + 0.02X22. When K(X3) was within (-1.68, 1.68), Y = 6.51–0.01X3 + 0.04X32.