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Table 3 Determinants of inorganic fertilizer and improved maize varieties adoption decisions

From: Farm technology adoption in Kenya: a simultaneous estimation of inorganic fertilizer and improved maize variety adoption decisions

Variable Inorganic fertilizer adoption Improved maize varieties Joint adoption
Coefficient Marginal effect Coefficient Marginal effect Marginal effect
Technology Adoption  
Manure −0.79*** (-6.04) −0.06***(-3.68) 0.03 (0.31) 0.07*** (4.23) −0.06***(-3.53)
Human and physical capital  
Head’s age −0.02** (-2.47) 0.001 (1.34) 0.001 (0.13) −0.001 (-1.30) −0.001(-1.03)
Head's age Sq 0.0002**(2.49)   −0.0001(-0.96)   
Head’s education      
Primary 0.1 (0.75) −0.02 (-1.28) 0.19**(1.97) 0.02(1.15) 0.04*(1.93)
Secondary 0.14 (0.84) −0.03 (-1.53) 0.28**(2.21) 0.03(1.32) 0.05**(2.10)
Tertiary 0.18 (0.73) −0.02 (-0.71) 0.24(1.29) 0.02(0.55) 0.05(1.48)
Male head 0.18 (1.24) −0.01 (-0.70) 0.18 (1.61) 0.01(0.53) 0.04*(1.92)
Household size −0.02 (-0.88) −0.0001(-0.02) −0.01 (-0.51) 0.0005 (0.13) −0.003(-0.93)
Wage rate −0.0002 (-0.09) −0.00001 (-0.04) 0.0003 (0.16) −0.0002 (-0.10) −0.00004(-0.13)
Institutional factors  
Credit access 3.1*** (4.85) 0.26*** (4.14) −0.39 (-0.92) −0.31*** (-4.60) 0.20**(2.23)
Secure tenure −0.08 (-0.97) −0.04***(-4.18) 0.26*** (3.94) 0.04*** (4.08) 0.03**(2.33)
Market distance −0.04*** (-3.05) −0.001(-0.52) −0.01** (-2.17) 0.001(0.99) −0.01***(-3.42)
Plot and soil characteristics  
Fast-drained soils 0.86*** (6.75) 0.02(1.38) 0.29*** (3.12) −0.03 (-1.58) 0.11***(6.44)
Plot Size (acres) 0.39*** (6.89) 0.01(0.79) 0.14*** (2.75) −0.01(-1.59) 0.05***(5.87)
Plot size (acres) Sq. −0.004***(-4.49)   0.0004(0.18)   
Year 2007 −0.14 (-1.55) −0.03***(-2.83) 0.14**(2.27) 0.03***(2.82) 0.01 (0.74)
Production Risks  
Expected yield 0.004*** (11.60) 0.0002*** (6.64) 0.001*** (3.24) −0.0002*** (-7.90) 0.0004***(11.45)
Variance −3.63D−07*** (-2.57) 1.32D (0.01) −1.73D−07* (-1.94) 6.01D−09 (0.46) −5.47D-08***(-2.73)
Means of time-varying variables  
Mean head age 0.002 (0.33)   0.002(0.40)   
Mean acres −0.26*** (-4.48)   −0.12**(-2.34)   
Mean wage −0.002 (-0.58)   0.003 (1.43)   
Mean household size 0.03 (0.76)   0.017 (0.62)   
Mean expected yield 0.002*** (6.26)   0.002***(7.59)   
Mean variance −4.13D−07*(-1.79)   5.96D−08(0.45)   
Intercept −4.41*** (-12.64)   −1.87*** (-8.27)   
LR test (ρ = 0) χ2(1) = 19.9***   χ2(1) = 19.9***   
No. of Observations 2334   2334   
  1. ***, ** and * indicate significance at 1%, 5% and 10%, respectively; figures in parentheses are Z-scores.