Research Article
Utilization of Organic Fertilizer in Ghana: Implications for Crop Performance and Commercialization
Table 8
Estimates of the endogenous treatment effect model of the impact of organic fertilizer on gross margin.
| Variables | Gross margin | OF | Coef. | Std. err. | Coef. | Std. err. |
| Farm size | 227.619 | 88.030 | | | Worth | 0.008 | 0.045 | 0.000 | 0.000 | Chemical fertilizer | −2.673 | 0.779 | | | Organic fertilizer | −0.697 | 0.675 | | | Age | | | 0.009 | 0.008 | Extension serv. | | | 0.003 | 0.052 | OF FBO | | | 0.552 | 0.217 | OF affordability | | | 0.342 | 0.232 | 1.OF (ATET) | 431.134 | 168.533 | | | Constant | −248.777 | 411.673 | −0.984 | 0.411 | /athrho | −1.226 | 0.210 | | | /lnsigma | 7.582 | 0.093 | | | rho | −0.842 | 0.061 | | | sigma | 1963.300 | 183.442 | | | lambda | −1652.150 | 250.469 | | | Log likelihood | −932.162 | | | | Wald test χ2 (19) | 51.77 | | | | LR test of independent equations χ2 (1) 12.5 |
|
|
Significant at 1% level of significance; significant at 5% significance level; significant at 10% significance level. |