Table 4 Cassava fertilization effect on Cu, Mn, Fe, and Zn (all in mg kg⁻¹) over the three different sampling periods after planting at α = 0.05

3.38^a

103.02^a

76.38^a

1.40^a

6.58^b

97.81^a

76.50^a

2.11^a

3.72^a

104.73^ab

82.13^a

1.87^a

2.73^ab

109.41^b

79.00^a

2.24^a

2.41^a

110.46^ab

78.75^a

2.19^ab

2.03^ab

115.13^b

81.00^a

2.05^a

3.90^a

114.70^b

79.88^a

3.12^b

2.06^a

111.09^b

80.63^a

2.18^a

0.7295

4.1885

1.1866

8.5705

4.1381

8.513

0.8691

0.1114

0.5502

0.0243

0.3482

0.0015

0.0253

0.0015

0.4788

0.9521

3.24^a

101.75^a

73.50^a

0.64^a

6.12^a

98.63^a

68.37^a

1.40^b

4.25^a

103.50^a

76.50^a

1.02^b

3.02^a

107.13^ab

75.75^b

1.38^b

2.86^a

109.38^a

77.00^a

1.50^c

2.74^a

106.50^ab

77.50^b

1.02^a

3.94^a

109.88^a

76.38^a

1.94^d

2.40^a

112.25^b

81.75^b

1.30^ab

0.3218

2.6491

0.8652

42.554

2.3654

4.9632

10.7156

4.038

0.8095

0.0866

0.4806

< 0.001

0.112

0.0137

< 0.001

0.0257

2.76^a

128.63^a

89.00^a

0.69^a

6.41^c

118.38^a

86.88^a

1.94^a

3.92^a

127.00^a

92.00^a

1.43^b

2.91^bc

136.13^b

95.75^b

1.93^a

2.55^a

135.13^a

92.88^a

2.15^c

1.78^a

135.63^b

91.25^ab

1.76^a

4.06^a

133.75^a

94.63^a

3.54^d

2.18^ab

134.38^b

94.63^b

2.18^a

2.1305

2.492

2.3137

78.18

11.9745

11.7901

6.6536

1.589

0.1391

0.0997

0.1174

< 0.001

< 0.001

< 0.001

0.0045

0.2336