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Table 3 Cassava fertilization effect on CEC, and exchangeable bases (cmol+ kg−1) at different sampling periods

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

Organic manure Mineral fertilizer
  CEC Ca2+ Mg2+ Na+ K+   CEC Ca2+ Mg2+ Na+ K+
4 MAP
O0 3.67a 2.38a 0.85a 0.01a 0.42a M0 4.27b 3.47a 1.03a 0.02a 0.24a
O1 4.01b 3.16ab 0.91a 0.02ab 0.53a M1 3.71a 3.26a 0.98a 0.02a 0.41a
O2 3.90ab 3.43bc 1.00ab 0.03ab 0.49a M2 3.67a 3.07a 0.94a 0.03a 0.57ab
O3 3.88ab 4.09c 1.12b 0.04b 0.62a M3 3.81a 3.25a 0.92a 0.03a 0.84b
F-value 2.9957 10.15 7.0216 4.0067 0.8062   11.9162 0.5511 1.1580 0.072 7.7144
p-value 0.064 < 0.001 0.004 0.028 0.5098   < 0.001 0.6551 0.3583 0.974 0.0024
8 MAP
O0 3.69a 2.01a 0.85a 0.012a 0.34a M0 4.05b 3.09b 1.07b 0.018a 0.18a
O1 3.95a 2.66b 0.87ab 0.017ab 0.39a M1 3.90ab 3.03ab 0.97ab 0.019a 0.37b
O2 3.85a 3.19bc 1.02b 0.022ab 0.44a M2 3.62a 2.50a 0.84a 0.021a 0.43b
O3 3.87a 3.60c 1.02b 0.029b 0.46a M3 3.79ab 2.84ab 0.87a 0.022a 0.65c
F-value 2.0541 25.3393 5.3156 5.9708 2.942   5.7742 3.7821 7.2504 0.3535 40.253
p-value 0.1494 < 0.001 0.0107 0.0069 0.067   0.0079 0.033 0.0031 0.7873 < 0.001
12 MAP
O0 3.38a 2.41a 0.93a 0.026a 0.55a M0 3.81b 4.24b 1.34b 0.032a 0.23a
O1 3.76b 3.52b 1.04ab 0.033ab 0.59a M1 3.67b 3.94ab 1.10ab 0.038a 0.54b
O2 3.67b 4.15c 1.18ab 0.039bc 0.62a M2 3.36a 3.58a 1.00a 0.038a 0.70bc
O3 3.69b 5.43d 1.28b 0.048c 0.69a M3 3.65b 3.77ab 0.99a 0.040a 0.97c
F-value 9.1877 90.315 4.4782 9.4235 0.7512   11.7613 4.514 5.0395 1.0404 20.2483
p-value 0.001 < 0.001 0.0195 < 0.001 0.5385   < 0.001 0.019 0.013 0.4031 < 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