Table 3 Regression equations of cotton plant biomass accumulation in the field affected by different N rates in 2015 and 2016
Treatment | 2015 | 2016 | ||
|---|---|---|---|---|
Regression equation | P | Regression equation | P | |
Cotton plant biomass (CPB) | ||||
N120 | y = 786.982 9/(1 + 5.598 6e-0.062 273t) | 0.000 3 | y = 980.733 3/(1 + 5.691 7e-0.061 461t) | 0.000 1 |
N150 | y = 811.292 8/(1 + 4.971 3e-0.059 909t) | 0.000 7 | y = 1 027.866 7/(1 + 6.148 2e-0.057 452t) | 0.000 0 |
N180 | y = 975.770 3/(1 + 7.9451e-0.093 036t) | 0.000 6 | y = 1 186.786 7/(1 + 6.384 5e-0.059 150t) | 0.000 0 |
N210 | y = 969.271 1/(1 + 7.160 7e-0.079 408t) | 0.000 8 | y = 1 236.666 7/(1 + 5.129 0e-0.043 108t) | 0.000 0 |
N240 | y = 1 027.845 8/(1 + 7.963 3e-0.081 425t) | 0.000 1 | y = 1 221.900 0/(1 + 5.304 2e-0.051 483t) | 0.000 1 |
Vegetative organ biomass (VOB) | ||||
N120 | y = 260.475 2/(1 + 9.347 4e-0.136 101t) | 0.001 6 | y = 436.250 0/(1 + 4.580 8e-0.044 042t) | 0.000 1 |
N150 | y = 304.022 1/(1 + 8.185 4e-0.124 564t) | 0.000 6 | y = 454.466 7/(1 + 4.378 4e-0.034 633t) | 0.000 3 |
N180 | y = 368.666 9/(1 + 7.523 5e-0.104 923t) | 0.004 9 | y = 520.433 3/(1 + 4.799 6e-0.041 825t) | 0.000 0 |
N210 | y = 335.545 8/(1 + 5.750 5e-0.080 168t) | 0.001 5 | y = 574.200 0/(1 + 4.524 8e-0.036 627t) | 0.000 2 |
N240 | y = 423.951 3/(1 + 4.658 3e-0.068 321t) | 0.000 9 | y = 569.866 7/(1 + 4.643 4e-0.046 620t) | 0.000 0 |
Reproductive organ biomass (ROB) | ||||
N120 | y = 441.844 5/(1 + 10.234 6e-0.105 497t) | 0.000 3 | y = 405.609 3/(1 + 11.406 5e-0.107 567t) | 0.000 0 |
N150 | y = 414.200 6/(1 + 10.500 9e-0.111 224t) | 0.000 3 | y = 411.200 0/(1 + 11.835 2e-0.114 011t) | 0.000 0 |
N180 | y = 498.375 7/(1 + 10.855 3e-0.117 894t) | 0.000 3 | y = 481.103 3/(1 + 13.842 1e-0.131 804t) | 0.000 0 |
N210 | y = 507.545 3/(1 + 10.761 0e-0.111 712t) | 0.000 3 | y = 453.466 7/(1 + 14.864 0e-0.137 449t) | 0.000 0 |
N240 | y = 441.066 2/(1 + 11.070 0e-0.119 538t) | 0.000 1 | y = 438.100 0/(1 + 15.860 4e-0.144 476t) | 0.000 0 |
Reproductive relative organ biomass (R. ROB) | ||||
N120 | y = 84.663 2/(1 + 5.864 1e-0.067 732t) | 0.003 9 | y = 138.883 3/(1 + 7.433 6e-0.076 408t) | 0.000 0 |
N150 | y = 93.070 1/(1 + 5.072 9e-0.059 136t) | 0.001 6 | y = 162.200 0/(1 + 7.241 6e-0.071 859t) | 0.000 0 |
N180 | y = 108.727 7/(1 + 5.011 3e-0.054 274t) | 0.000 1 | y = 185.250 0/(1 + 6.836 9e-0.065 929t) | 0.000 0 |
N210 | y = 126.180 0/(1 + 4.835 3e-0.058 124t) | 0.004 8 | y = 209.416 7/(1 + 5.751 7e-0.050 508t) | 0.000 1 |
N240 | y = 162.828 3/(1 + 4.606 6e-0.050 356t) | 0.003 6 | y = 213.933 3/(1 + 5.828 8e-0.050 712t) | 0.000 0 |