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Table 3 Mean ( ± standard deviation) values of leaf nutrient concentrations of the root stock seedlings at cut-back stage of 18 weeks after planting and the scion plants at 12 weeks after cut-back of the root stock seedlings

From: Effect of rubber wood biochar on nutrition and growth of nursery plants of Hevea brasiliensis established in an Ultisol

Treatment

N

P

K

Mg

Ca

Mn

Zn

Fe

%

mg kg-1

Seedling leaves

0% biochar + no LF

1.74 ± 0.13b

0.18 ± 0.05a

1.27 ± 0.04a

0.16 ± 0.02bc

0.34 ± 0.01a

73 ± 19b

36 ± 13a

226 ± 38a

0% biochar + N-P-K-Mg

2.27 ± 0.27ab

0.19 ± 0.03a

0.71 ± 0.09b

0.24 ± 0.02a

0.22 ± 0.06b

138 ± 48a

32 ± 2a

185 ± 79a

1% biochar + no LF

2.12 ± 0.14ab

0.19 ± 0.04a

0.94 ± 0.34b

0.14 ± 0.03c

0.25 ± 0.03b

65 ± 25b

29 ± 15a

262 ± 98a

1% biochar + N-Mg

2.30 ± 0.51ab

0.20 ± 0.06a

0.45 ± 0.26c

0.22 ± 0.10a

0.15 ± 0.05c

66 ± 29b

32 ± 11a

188 ± 33a

2% biochar + no LF

2.19 ± 0.28ab

0.22 ± 0.04a

0.87 ± 0.13b

0.13 ± 0.03c

0.13 ± 0.03c

9 ± 1c

18 ± 5a

231 ± 76a

2% biochar + N-Mg

2.53 ± 0.20a

0.23 ± 0.02a

0.44 ± 0.08c

0.21 ± 0.04ab

0.12 ± 0.02c

102 ± 29ab

29 ± 15a

254 ± 97a

 

Scion leaves

0% biochar + no LF

2.60 ± 0.46d

0.27 ± 0.01a

1.24 ± 0.04a

0.39 ± 0.03a

0.58 ± 0.09a

47 ± 9e

34 ± 5d

196 ± 42a

0% biochar + N-P-K-Mg

3.92 ± 0.58a

0.29 ± 0.01a

1.12 ± 0.06a

0.30 ± 0.08b

0.30 ± 0.03c

91 ± 27b

69 ± 19ab

174 ± 71a

1% biochar + no LF

2.87 ± 0.35cd

0.31 ± 0.03a

1.20 ± 0.25a

0.20 ± 0.01c

0.39 ± 0.05bc

74 ± 12cd

57 ± 7bc

306 ± 139a

1% biochar + N-Mg

3.80 ± 0.26ab

0.30 ± 0.02a

0.68 ± 0.12b

0.21 ± 0.02c

0.46 ± 0.04b

127 ± 13a

78 ± 15a

213 ± 125a

2% biochar + no LF

2.93 ± 0.59bcd

0.28 ± 0.01a

1.07 ± 0.18a

0.22 ± 0.01c

0.42 ± 0.05b

68 ± 4d

48 ± 2cd

311 ± 85a

2% biochar + N-Mg

3.73 ± 0.50abc

0.30 ± 0.03a

0.79 ± 0.12b

0.20 ± 0.01c

0.41 ± 0.03b

86 ± 7bc

66 ± 6ab

276 ± 42a

  1. Values followed by the same superscripts in a column at a given growth stage are not significantly different at p < 0.05.