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Table 1. Physico-chemical properties of an Ultisols where cassava is cultivated in Kerala

Depth (cm) pH OC (%) N P Kg/ha) K Ca cmol(+)/kg Mg cmol(+)/kg S Fe Mn mg kg Zn Cu B Sand (%) Silt Clay
0-28 5.05 1.96 182.24 29.34 103.34 0.41 0.07 6.55 34.12 10.18 1.25 1.17 0.74 64.81 5.59 29.60
28-63 5.00 1.47 58.34 11.38 52.39 0.29 0.05 3.21 23.18 5.52 0.65 0.87 0.58 58.30 7.51 34.20
63-87 5.20 0.52 42.14 6.59 34.11 0.21 0.03 2.34 13.45 3.21 0.32 0.52 0.39 50.72 8.54 40.75
97-2700 4.95 0.33 38.89 4.32 22.87 0.17 0.02 0.96 8.91 1.08 0.27 0.19 0.12 57.04 7.47 35.50
Central Tuber Crops Research Institute
Sreekariyam, Thiruvananthapuram, Kerala - 17