Agriculture Reference
In-Depth Information
Table 3.2
Results of logistic regression analyses at household and field levels based on data
gathered in five villages in the Cagayan Valley, the Philippines
Variables
Parameter
Standard
Significance
Significance
estimate
a
error
incl. AGRO-
ECOZONE
Household level
b
Constant
−3,709
1,269
0.003
0.003
AGROECOZONE
ll
-
-
-
0.004
AGROECOZONE
hl
-
-
-
0.304
AGROECOZONE
lul
-
-
-
0.001
CAPTALAV
low
0.970
0.494
0.050
0.209
EDUC
up to primary
0.109
0.587
0.853
0.887
EXTENSION
no
−1,400
0.515
0.007
0.066
ETHNIC
non-Ilocano
0.832
0.706
0.238
0.911
TOTLAND
0.529
0.222
0.017
0.225
LABORAV
−0.012
0.459
0.980
0.955
MEMBER
no
0.783
0.478
0.102
0.849
NFLABOR
0.058
0.026
0.024
0.062
AGE
0.058
0.020
0.003
0.001
Field level
c
Constant
−1.075
0.514
0.036
-
PLOTSIZE
1.760
0.424
0.000
-
DISTANCE
−0.014
0.006
0.014
-
SLOPE
flatland
−0.566
0.349
0.105
-
SOILTEXTURE
fine
0.007
-
SOILTEXTURE
medium
0.423 0.375 0.260
SOILTEXTRUE
coarse
−1.019 0.446 0.022
TENADAP
insecure
0.946 0.383 0.013 -
a
estimates for model if excluding the dummy variable LOCATION from model at household
level
b
n = 132; Right predictions: 75.8 percent; −2 Log likelihood: 122.536; model Chi-square: 59.970
significant at 0.01 level; Nagelkerke R Square: 0.487
c
n = 298; right predictions: 79.4 percent; 2 Log likelihood: 233.1442; model Chi-square: 83.554,
significant at 0.01 level; Nagelkerke R Square: 0.487
positively related with tree growing (significant at 0.01 and 0.05 levels respec-
tively), whereas the distance of a field to the farm house (DISTANCE) shows a
negative relationship.
Table 3.3 shows the different types of tree planting systems specified for the
three different agro-eco zones. Boundary planting is by far most common, while the
representation of mixed cropping systems (i.e., trees combined with seasonal crops
in a non-boundary arrangement) is surprisingly low. For the lowland zone no farm
component combinations with livestock were found, as opposed to the hilly low-
land and upland zones with 23 percent of the fields falling into these categories.
There is a high variability in tree densities (Table 3.3). The diversity of tree spe-
cies integrated in farm fields is low, with only five percent of all fields containing
more than ten different species (data not shown in table). In most fields (51 percent
of total), only two to five tree species are grown. Most trees are planted, i.e., not
grown from spontaneously sprouting wild seeds, unlike past times when most trees
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