Do research results and on-farm demonstrations show that crops grown by the target group are fertilizer responsive?
Some rules of thumb for assessing the adequacy of fertilizer re sponse in low productivity zones include: An output nutrient ratio of 7 to 10 for cereal crops (calculated as the additional kgs of yield attributable to the use of fertilizer divided by the kgs of fertilizer nutrients (N, P, K) applied); A value/cost ratio of 3 or more (calculated as the value of additional output (kg * price) divided by the cost of the fertilizer treatment). If poor households in the target group are unlikely to be able to follow recommended production practices due to resource constraints, using higher cut-off values for output/nutrient and VCRs will reduce the risk of your program not meeting objectives.
