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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

From: Soil fertility status of cassava fields treated by integrated application of manure and NPK fertilizer in Zambia

Organic manure Mineral fertilizer
  Cu Mn Fe Zn   Cu Mn Fe Zn
4 MAP
O0 3.38a 103.02a 76.38a 1.40a M0 6.58b 97.81a 76.50a 2.11a
O1 3.72a 104.73ab 82.13a 1.87a M1 2.73ab 109.41b 79.00a 2.24a
O2 2.41a 110.46ab 78.75a 2.19ab M2 2.03ab 115.13b 81.00a 2.05a
O3 3.90a 114.70b 79.88a 3.12b M3 2.06a 111.09b 80.63a 2.18a
F-value 0.7295 4.1885 1.1866 8.5705   4.1381 8.513 0.8691 0.1114
p-value 0.5502 0.0243 0.3482 0.0015   0.0253 0.0015 0.4788 0.9521
8 MAP
O0 3.24a 101.75a 73.50a 0.64a M0 6.12a 98.63a 68.37a 1.40b
O1 4.25a 103.50a 76.50a 1.02b M1 3.02a 107.13ab 75.75b 1.38b
O2 2.86a 109.38a 77.00a 1.50c M2 2.74a 106.50ab 77.50b 1.02a
O3 3.94a 109.88a 76.38a 1.94d M3 2.40a 112.25b 81.75b 1.30ab
F-value 0.3218 2.6491 0.8652 42.554   2.3654 4.9632 10.7156 4.038
p-value 0.8095 0.0866 0.4806 < 0.001   0.112 0.0137 < 0.001 0.0257
12 MAP
O0 2.76a 128.63a 89.00a 0.69a M0 6.41c 118.38a 86.88a 1.94a
O1 3.92a 127.00a 92.00a 1.43b M1 2.91bc 136.13b 95.75b 1.93a
O2 2.55a 135.13a 92.88a 2.15c M2 1.78a 135.63b 91.25ab 1.76a
O3 4.06a 133.75a 94.63a 3.54d M3 2.18ab 134.38b 94.63b 2.18a
F-value 2.1305 2.492 2.3137 78.18   11.9745 11.7901 6.6536 1.589
p-value 0.1391 0.0997 0.1174 < 0.001   < 0.001 < 0.001 0.0045 0.2336
  1. Means in the same column with the same letter are not significantly different. MAP months after planting. O0 = control (without manure application), O1 = 1.4 t ha−1 chicken manure, O2 = 2.8 t ha−1 chicken manure, O3 = 4.2 t ha−1 chicken manure, M0 = control (without mineral fertilizer), M1 = 50N-11P-41.5 K kg ha−1, M2 = 100N-22P-83 K kg ha−1, M3 = 150N-33P-123.5 K kg ha−1