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Table 3 Location, classification and land use history of the 10 sites used for the study

From: Carbon storage in soils of Southeastern Nigeria under different management practices

Site Number Location/Annual rainfall Soil Classification Land use history
1 Abakaliki I 6°19'N,8°06'E 2069 mm Aquept
Flood Plain
Conventionally-tilled with traditional hoes, planted with
Cassava {Manihot esculenta}/vegetables (Amaranth {Amaranthus hybridus}, Okra {Albemoschus esculentus},Waterleaf {Talinum triangulare} )/maize {Zea mays} intercrop with 2-year fallow period in 10 years, no fertilization, crop residues not removed.
2 Enugu I 6°27'N,7°29'E 1792 mm Typic Paleustult Midslope Conventionally-tilled with traditional hoes, continuously-cropped with maize/cassava/yam {Dioscorea rotundata} intercrop for ten years. NPK 15:15:15 fertilizers used at low doses (30-50 kg ha-1), crop residues left in the field.
3 PortHarcourt 4°46'N,7°01E
2450 mm
Typic Paleustult
Floodplain
Conventionally-tilled, unmulched, cropped to maize and cassava for 12 consecutive years, fertilized with low dose (30-50 kg ha-1) of NPK 15:15:15 fertilizer, crop residues left in the field.
4 Enugu II
06° 27'N,7°32'E
1792 mm
Typic paleustult
Midslope
Artificial forest established by Forestry Department in 1962. Planted with Gmelina arborea and Tectona grandis (Teak).
5 Enugu III
06° 27'N,7°32'E
1792 mm
Typic paleustult
Midslope
Adjacent land near the artificial forest cropped-continuously for 15 years with cassava, yam, pulses and vegetables in a mixed culture. No fertilization and crop residues not removed.
6 Ihe,Awgu I
06° 30'N,7°15'E
1752 mm
Typic paleudult
Toeslope
Natural undisturbed forest (sacred land). Had existed for more than 80 years. People are forbidden entry. Hunting of animals/games and cutting of trees/fetching of firewood not allowed.
7 Enugu IV
06° 27'N,7°25'E
1750 mm
Typic Paleudult
Midslope
Artificial grassland (golf course) established in 1934.
Mainly made up of Paspalum notatum, Axonopus compressus
and Cyperus rotundus. Regularly cut and fertilized with N:P:K 15:15:15 fertilizer.
8 Abakaliki II
6°04'N,8°65'E
2069 mm
Typic Haplaudult
Crest
Artificial Gmelina arborea forest established 30 years ago.
The alleys between the trees are currently cropped with different food crops(cocoyam, yam, cowpea, maize) by urban farmers. Municipal wastes used for fertilization, conventionally-tilled.
9 Nsukka, I
6°52'N,7°24'E
1700 mm
Typic Paleustult
Footslope
University Research plot, fallowed for two years, conservation tillage, planted with maize and groundnut, fertilization with NPK 15:15:15 at 90 kg ha-1 and poultry droppings at 10 Mg ha-1 for three years.
10 Ihe,Awgu II
06° 30'N,7°05'E
1752 mm
Typic Paleudult
Toeslope
Farmers plot, conventionally-tilled, planted with cassava/maize/vegetables (fluted pumpkins, cabbage, cowpea, Amaranth) with 2-year fallow interval, NPK 15:15:15 fertilizers used at low doses (30-50 kg ha-1), crop residues left in the field, farm managed as stated for 12 years.
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