An Economic Assessment of Banana Genetic Improvement and ...

100 CHAPTER 7
Table 7.3 Factors influencing the probability and extent of use of soil fertility management
practices
Probit model:
Manure
Probit model:
Mulch
Second step of
Heckman model:
Manure
Ordinary least
squares model:
Mulch
Variable
Marginal
effects
Standard
error
Marginal
effects
Standard
error
Coefficient
Standard
error
Coefficient
Standard
error
Farm characteristics (Ω F )
Elevation –0.177 0.112 –0.042 0.110 –0.053 0.088 –0.116** 0.059
Plot drainage 0.137** 0.069 –0.008 0.055 0.037 0.045 –0.018 0.032
Moisture retention capacity 0.087 0.083 –0.121* 0.074 0.026 0.047 0.010 0.039
Slope of the farm –0.144* 0.082 0.029 0.068 0.004 0.045 0.122*** 0.036
Number of banana mats 8.3 × 10 –5 0.0001 0.0003** 0.0001 0.0001 0.000 –0.0001*** 4.7 × 10 –5
Household characteristics (Ω HH )
Age –0.006*** 0.002 0.0001 0.002 –0.002 0.001 0.0002 0.001
Gender 0.001 0.068 –0.021 0.055 0.012 0.041 0.050* 0.030
Education 0.004 0.009 0.013* 0.008 –0.002 0.006 0.011*** 0.004
Household size 0.021 0.014 0.022*** 0.012 0.020** 0.010 0.010 0.007
Dependency ratio 0.062 0.160 –0.218* 0.121 0.021 0.104 0.100 0.076
Livestock unit 0.099*** 0.021 0.019 0.015 0.008 0.010 –0.005 0.008
Per capita cultivatable land 0.026 0.022 0.049* 0.030 0.003 0.010 0.022*** 0.008
Exogenous income (I ) 8.5 × 10 –7 1.4 × 10 –6 1.6 × 10 –6 2.1 × 10 –6 1.1 × 10 –6 * 4.7 × 10 –7 5.5 × 10 –7 4.6 × 10 –7
Market characteristics (Ω H )
Distance from paved roads –0.009 0.006 –0.014*** 0.005 0.001 0.004 0.002 0.002
Price to wage ratio 3.165*** 1.285 4.085*** 1.167 1.526*** 0.632 2.129*** 0.482
Diffusion parameters (Ω D )
Extension 0.022 0.017 0.013 0.019 0.020** 0.009 –0.003 0.007
Exposure 0.171*** 0.082 0.044 0.069 0.103** 0.051 0.054 0.039
Relative experience (τ) 1.084*** 0.227 0.830*** 0.154 –0.168 0.140 0.022 0.074
Social capital (Ω S )
Membership density 0.034 0.040 0.027 0.036 –0.068*** 0.025 0.038** 0.017
Leader heterogeneity 0.168*** 0.064 0.050 0.050 0.087** 0.040 0.076*** 0.031
Norms of decisionmaking 0.220*** 0.087 0.230*** 0.068 0.014 0.061 –0.015 0.046
Net labor transfers 6.8 × 10 –6 5.2 × 10 –6 –3.0 × 10 –6 3.7 × 10 –6 5.8 × 10 –7 3.12 × 10 –6 1.2 × 10 –6 3.63 × 10 –6
Net cash transfers 2.3 × 10 –6 * 1.23 × 10 –6 1.5 × 10 –7 9.3 × 10 –7 –6.2 × 10 –7 5.3 × 10 –7 1.6 × 10 –8 4.73 × 10 –7
Net others transfers 3.8 × 10 –6 ** 1.5 × 10 –6 1.5 × 10 –6 1.3 × 10 –6 –1.7 × 10 –6 * 9.8 × 10 –7 –3.4 × 10 –7 6.2 × 10 –7
Mills ratio 0.001** 0.000 7.7 × 10 –8 5.5 × 10 –8
Constant –0.086 0.461 –0.416 0.352
F (26, 104) 4.44 5.89
Probability > F 0 0
R 2 0.5258 0.4387
Adjusted R 2 0.4073 0.3642
Number of observations 332 = 332 = 131 223