Land resources of central Nigeria Agricultural development ...

it is classed as limitation category 2 (See Table 9.) In the case of
maize, the texture and the coarse material are both considered as minor
limitations and by reference to Table 9 the soil is placed in soil
limitation category 3.
TABLE 10 Percentage of soils of various codes in Land System 18 and
Land
system
18 2
their relationship to soil limitation categories for certain
crops
Soil code % of land
system in
Soil limitation category by crop
D W T C each code Maize Millet Sorghum Groundnut Cotton
2
1
0
O
0
3+
3+
3+
Ranking of land systems
2
5
O
30-59
10-29
10-29
Land systems with the highest proportion of SLC 1 land have least limitations
to the growth of a given crop. If two land systems have a high proportion of
SLC 1 land, the one in which the remaining land is SLC 2 or 3 can be
considered to be better than the one in which the remaining land is SLC 4 or
5.
A land system is considered especially favourable for the production of a
crop if it has one of the following combinations of SLCs:
- at least 30-50% SLC 1 + any other SLC
- > s 60% SLC 2
- at least 30-50% SLC 2 + 10-29% SLC 1
- 30-59% SLC 2 + 10-29% SLC 3
- 10-29% SLC 1 + 10-29% SLC 2 + 10-29% SLC 3.
Land systems with these combinations of soil limitation categories are shown
on the legend of Separate Map 3. The legend of Separate Map 1 shows the
percentages of the soil limitation categories in all the land systems in
the area.
3
3
2
«13
2
3
1
2
3
2
2
3
1
4
5
3