The systemic review of Masset et al, 2011, found that only five studies reported an agricultural programme impact on total household income. This review only looks at those interventions that have the explicit goal of improving the nutritional status of children via an increase in income and a change in diet.

All studies that collected data on total household income found a large impact of the interventions, but only in one case was the statistical difference between project and control groups tested.  Therefore on this basis alone, it is difficult to draw any conclusion from the results reported by these studies.

Also, some studies reported project impact on incomes from a particular source, such as income from home gardening (Bushamuka et al. 2005, Olney et al. 2009, Talukder et al. 2010), or on cash income from sales of the food item promoted by the intervention, for example from market sales of home garden produce (Chakravarty 2000). This is an imprecise measure of income because substitution effects in production are possible, so the overall impact on household income, and therefore on food expenditure, remains unclear. 

These data may provide evidence of the programme success in promoting production of a specific good but do not represent evidence of an overall increase in household resources.