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Table 3 Changes in leaf N, P and K concentrations for different treatments in 2012 and 2013

From: The effects of straw-returning and inorganic K fertilizer on the carbon–nitrogen balance and reproductive growth of cotton

Year Treatment Peak flower stage (PFS) Boll-setting stage (BSS) Boll-opening stage (BOS)
K /(mg·kg−1) N /(mg·kg−1) P /(mg·kg−1) K /(mg·kg−1) N /(mg·kg−1) P /(mg·kg−1) K /(mg·kg−1) N /(mg·kg−1) P /(mg·kg−1)
2012 CK 29.45 a 32.01 a 3.17 a 13.59 c 25.02 a 2.95 a 8.84 b 16.38 b 2.25 a
K150 31.24 a 31.65 a 2.98 a 18.55 b 27.04 a 3.23 a 16.09 a 20.29 a 2.54 a
W9000 34.05 a 29.97 a 3.16 a 21.66 a 27.84 a 3.18 a 18.51 a 21.95 a 2.54 a
2013 CK 23.80 b 37.04 a 3.54 a 10.48 c 26.46 b 2.65 a 9.09 b 15.94 b 2.25 a
K150 32.83 a 36.80 a 3.40 a 17.42 b 30.33 a 2.82 a 15.81 a 18.68 a 2.31 a
W9000 30.45 a 35.57 a 3.32 a 21.89 a 29.06 a 2.68 a 16.49 a 20.11 a 2.38 a
  1. CK, no crop straw and K fertilizer were applied as the blank control treatment; K150, 150 k·gha−1 K2O was applied before transplanting the cotton seedlings; and W9000, 9 000 kg·ha−1 wheat straw was crushed and incorporated in 010 cm soil before transplanting. Values followed by different letters within the same column are significantly different at P = 0.05. Each value represents the mean of three replications