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Table 2 Cassava fertilization effect on pH (water), OC (%), TN (%) and AP (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
  pH OC TN AP   pH OC TN AP
4 MAP
O0 5.27a 1.13a 0.058a 36.63a M0 5.68a 1.26b 0.066a 43.07a
O1 5.55ab 1.28b 0.066ab 63.61ab M1 5.47a 1.24ab 0.067a 58.24ab
O2 5.60b 1.21ab 0.066ab 67.53ab M2 5.50a 1.15a 0.061a 71.04ab
O3 5.77b 1.23b 0.071b 101.96b M3 5.54a 1.20ab 0.067a 97.39b
F-value 6.7156 8.3069 4.9478 5.3507   1.2955 4.7104 1.6284 3.9428
p-value 0.004 0.0017 0.0139 0.0105   0.3123 0.0165 0.2249 0.0294
8 MAP
O0 5.22a 1.18a 0.060a 35.26a M0 5.73b 1.23b 0.067a 47.34a
O1 5.32ab 1.20a 0.064a 50.96b M1 5.42ab 1.23b 0.063a 66.67bc
O2 5.57bc 1.21a 0.067a 72.12c M2 5.38a 1.15a 0.061a 59.39ab
O3 5.75c 1.23a 0.067a 90.00d M3 5.32a 1.21ab 0.066a 74.93c
F-value 7.9466 1.2766 2.7402 47.700   4.6928 4.1016 1.8743 11.369
p-value 0.002 0.3183 0.0799 < 0.001   0.016 0.026 0.1773 < 0.001
12 MAP
O0 5.09a 1.14a 0.061a 42.49a M0 5.86b 1.28c 0.074b 69.97a
O1 5.41b 1.25b 0.070b 65.36a M1 5.41a 1.25bc 0.072ab 92.52a
O2 5.71c 1.21ab 0.074bc 107.77b M2 5.43a 1.15a 0.068a 85.33a
O3 5.94d 1.25b 0.077c 155.79c M3 5.45a 1.17ab 0.069a 123.59b
F-value 42.891 7.3924 32.26 46.829   14.276 9.8746 5.067 9.555
p-value < 0.001 0.0029 < 0.001 < 0.001   < 0.001 < 0.001 0.0127 < 0.001
  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