Annual K-fertilizer rate

(kg K ha−1)

3-year average

seedcotton yield (kg∙ha−1)

Cumulative

(3-year) K rate

(kg K ha−1)

Total 3-year yield

seedcotton yield (kg∙ha−1)

0

2940

0

8720

27.9

3061

83.7

9184

55.8

3196

167.3

9600

83.7

3353

251.0

10,060

111.6

3289

334.7

9868

139.4

3438

418.3

10,316