International Journal of Horticulture, 2017, Vol.7, No. 31, 288-298
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Table 3 Quadratic functions of soil chemical characteristics for nutrient absorption index in Thompson Seedless on different
rootstocks
Soil Character (X) Nutrient (Y)
Rootstock
Function
R
2
X- Opt
Y-Max
OC
N
Own root
Y = 58.3 – 14.2X +7.41X
2
0.616
0.96
51.5
Dogridge
Y = 21.8 + 41.5X – 6.84X
2
0.019
3.03
84.7
110R
Y = 77 + 1.01X - 0.96X
2
0.222
0.55
77.3
OC
S
Own root
Y = 4.84 – 2.14X + 0.52X
2
0.167
2.06
2.64
Dogridge
Y = -1.85 + 2.73X – 0.41X
2
0.127
3.33
2.69
110R
Y = 2.68 - 0.19X – 0.06X
2
0.109
-1.58
2.83
pH
P
Own root
Y = 8249.7 – 2025.2X + 124.5X
2
0.615
8.13
13.9
Dogridge
Y = 1752.3 – 424.3X + 25.9X
2
0.446
8.19
14.6
110R
Y = -311 +88.8X – 5.86X
2
0.070
7.58
25.4
pH
Ca
Own root
Y = 1577.9 – 400.2X + 25.4X
2
0.579
7.88
1.52
Dogridge
Y = 149.8 – 39.2X + 2.61X
2
0.372
7.51
2.61
110R
Y = 101.2 – 27.2X + 1.88X
2
0.266
7.23
2.82
pH
S
Own root
Y = -323.6 +84X – 5.39X
2
0.142
7.79
3.67
Dogridge
Y = 66.4 -15.3X + 0.92X
2
0.196
8.48
2.81
110R
Y = 5.38 - 0.5X + 0.02X
2
0.016
12.5
2.26
EC
N
Own root
Y = 52.4 + 32.1X + 3.8X
2
0.195
-4.22
-15.4
Dogridge
Y = 71.2 + 47.6X – 38.1X
2
0.048
0.62
86.1
110R
Y = 107.2 – 85.5X + 38.2X
2
0.340
1.12
59.4
EC
S
Own root
Y = -1.03 + 13.7X – 7.75X
2
0.414
0.88
5.02
Dogridge
Y = 2.27 – 0.29X + 0.79X
2
0.228
0.18
2.24
110R
Y = 2.99 – 1.46X + 0.98X
2
0.147
0.74
2.45
EC
Fe
Own root
Y = 23.8 – 53.8X + 33.1X
2
0.204
0.81
1.94
Dogridge
Y = 6.24 + 4.22X – 0.11X
2
0.047
19.2
4.67
110R
Y = -1.16 +18.6X – 4.33X
2
0.326
2.15
18.8
EC
Mn
Own root
Y = 29.4 – 50.2X + 28.5X
2
0.184
0.88
7.29
Dogridge
Y = 1.22 + 24.7X - 7X
2
0.446
1.76
23.0
110R
Y = 12.3 – 8.28X + 4.92X
2
0.091
0.84
8.82
EC
Zn
Own root
Y = 16 – 8.89X + 8.88X
2
0.048
0.50
13.8
Dogridge
Y = 21.6 – 53.5X + 45.3X
2
0.744
0.59
5.8
110R
Y = 4.63 +8.03X – 2.43X
2
0.084
1.65
11.3
CaCO
3
K
Own root
Y = 40.7 + 2.95X – 0.2X
2
0.318
7.38
51.6
Dogridge
Y = 20.6 + 2.35X – 0.14X
2
0.315
8.39
31.7
110R
Y = 3.09 + 2.67X – 0.06X
2
0.136
22.3
32.8
CaCO
3
Ca
Own root
Y = -15.1 + 2.43X – 0.07X
2
0.210
17.4
5.99
Dogridge
Y = 3.01 – 0.27X + 0.02X
2
0.279
6.75
2.10
110R
Y = 4.26 – 0.25X + 0.01X
2
0.122
12.5
2.70
CaCO
3
Na
Own root
Y = -1.56 + 2.04X – 0.05X
2
0.043
20.4
19.2
Dogridge
Y = 64.5 – 7.43X + 0.25X
2
0.370
14.9
9.3
110R
Y = 0.07 + 1.44X – 0.05X
2
0.116
14.4
10.4
ESP
N
Own root
Y = 114.2 – 2.64X – 0.37X
2
0.413
3.57
100.1
Dogridge
Y = -66.7 + 38X – 2.25X
2
0.138
8.4
93.7
110R
Y = 107.5 – 6.92X + 0.29X
2
0.035
11.9
25.2
ESP
P
Own root
Y = 106.2 – 14.4X + 0.51X
2
0.350
14.1
4.55
Dogridge
Y = -10.7 + 8.23X – 0.5X
2
0.096
8.23
23.2
110R
Y = -81.9 +26.9X – 1.65X
2
0.149
8.15
27.7
ESP
K
Own root
Y = 14.4 + 13.3X – 1.36X
2
0.349
4.89
46.9
Dogridge
Y = 83.5 - 14X + 0.67X
2
0.303
10.4
10.4
110R
Y = -103.7 + 35.4X – 2.28X
2
0.239
7.76
33.7
ESP
Fe
Own root
Y = 67.3 – 17.3X + 1.19X
2
0.366
7.27
4.42
Dogridge
Y = 3.21 + 0.15X + 0.07X
2
0.206
-1.07
3.13
110R
Y = -80.8 + 22.2X – 1.3X
2
0.108
8.54
14.0
