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Table 1 OC, TN, AvP, EC, CEC, and pH under Oxytenanthera abyssinica and Dalbergia melanoxylon trees with different radii from trunk of the tree

From: Dispersed trees on smallholder farms enhance soil fertility in semi-arid Ethiopia

Tree Radius from the tree (m) OC% TN% AvP EC CEC pH C-to-N
Oxytenanthera abyssinica Under canopy 1.73 (0.16)a 0.26 (0.01)a 7.21 (0.20)a 0.07 (0.01) 55.74 (1.35)a 6.13 (0.10)a 6.50 (0.47)a
  Near to canopy 1.28 (0.09)b 0.13 (0.01)b 6.55 (0.19)a 0.07 (0.01) 48.02 (1.45)b 6.30 (0.08)ab 12.10 (2.10)b
Far from canopy 1.30 (0.11)b 0.12 (0.01)b 6.02 (0.21)b 0.08 (0.01) 45.02 (2.18)b 6.56 (0.09)b 11.44 (0.43)b
F value 4.179 57.337 9.125 0.852 10.569 5.922 5.806
  P value * *** *** 0.4333 *** ** **
Dalbergia melanoxylon Under canopy 1.02 (0.06)a 0.13 (0.005)a 6.37 (0.28)a 0.11 (0.01) 39.27 (3.20) 7.29 (0.14) 7.74 (0.5)
Near to canopy 0.70 (0.06)b 0.09 (0.005)b 5.78 (0.21)ab 0.11 (0.01) 30.32 (3.81) 7.16 (0.18) 8.59 (1.0)
Far from canopy 0.65 (0.05)b 0.07 (0.004)c 5.32 (0.17)b 0.14 (0.01) 32.56 (3.68) 7.15 (0.21) 10.02 (1.1)
F value 11.924 51.841 5.525 3.073 1.699 0.193 1.601
P value *** *** ** 0.056 0.194 0.825 0.212
  1. Note: Rows with the same superscript letters are not significantly different at P < 0.05. Standard error (SE) mean is shown in parenthesis, * are given when P values less than 0.05, ** are given when P values less than 0.01, and *** are given when P values less than 0.001
  2. OC % organic carbon percent, Total N% total nitrogen, Available P (ppm) available phosphorus, EC (dS/m) electrical conductivity, CEC meq/100 g cation exchange capacity