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Table 2 The fitting of reproductive organ biomass accumulation and main eigenvalues of reproductive organ biomass accumulation 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 Regression equations R2 Fast accumulation period Fastest accumulation point
DAS1 /d DAS2/d T/d VT/(kg·d−1) Vm/(kg·d−1) DASm/d
2012 CK Bio = 1 979.8/(1 + 563 429.6e−0.136 5DAS) 0.991 3** 87.4 106.7 19.3 59.6 67.5 97.0
K150 Bio = 3 718.6/(1 + 722 502.4e−0.113 0DAS) 0.987 8** 107.7 131.0 23.3 92.8 105.0 119.4
W9000 Bio = 3 829.4/(1 + 238 847.9e−0.100 8DAS) 0.999 2** 109.8 136.0 26.1 85.1 96.4 122.9
2013 CK Bio = 2 220.2/(1 + 4 127 754.6e−0.138 5DAS) 0.992 6** 100.5 119.5 19.0 67.9 76.9 109.9
K150 Bio = 4 617.7/(1 + 667 640.8e−0.117 0DAS) 0.991 6** 103.3 125.8 22.5 119.3 135.1 114.6
W9000 Bio = 4 926.3/(1 + 321 420.9e−0.107 0DAS) 0.996 2** 106.2 130.7 24.5 116.3 131.8 118.5
  1. CK, no crop straw and K fertilizer were applied as the blank control treatment; K150, 150 kg·ha−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. DAS1, DAS2 and T mean the start time, termination time and duration of rapid accumulation of reproductive organ biomass; Vm and DASm present the maximum accumulation rate and occurrence time of maximum accumulation rate of reproductive organ biomass; VT refers to the average speed of reproductive organ biomass accumulation during T. ** significant at P < 0.01