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Fertility Mapping
Soil samples collected from the field
were analyzed in the soil laboratory. The
results were inputed in a GIS software and
an interpolated maps were derived. Digitized
nitrogen (N), phosphorus (P), potassium (K)
recommendation maps and pH map were
developed (sample maps attached).
Nitrogen (N) Recommendation Map
Nitrogen recommendation map showed
that the areas of Lasam, Villaverde, Quezon
and Aglipay corn clusters in Quirino including
Lallo, Pamplona, Peñablanca, Tuguegarao
City, Sta. Teresita, Maddela are requiring a
maximum rate of nitrogen application at 120
kg/ha. (Table 1).
Phosphorous (P) Recommendation Map
Areas ranging from 40-50% in
Maddela, Quezon, Sta. Teresita and Villaverde
clusters require a rate of minimum (20kg/ha)
rate of phosphorus application. While some
areas (30-60) of Penablanca, Lasam, Lallo and
Aglipay clusters are requiring a maximum rate
of phosphorous (60kg/ha) (Table 1).
Potassium (K) Recommendation Map
The whole cluster areas of Lasam
and Maddela are sufficient in Potassium.
Majority (70-90%) of the area in Penablanca,
Pamplona, Villaverde, Quezon and Aglipay
are also sufficient which requires a minimum
application rate of 30kg/ha (Table 1).
pH Map
Observations from the generated pH
map of the ten corn cluster areas are also
shown in the table below.
Table 2. Fertilizer and pH status of corn clusters. *Based on maps generated for the 10 clusters
Fertilizer Recommendation Reference
Fertilizer recommendation reference for
each farmer within the clusters was extracted
from the interpolated N, P, K and pH digitized
G.M. Oli, et.al
maps developed. These are the final outputs
which are given to the farmers as reference.
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