The figure below presents a list of ways growers can determine fertility and lime needs of their fields and shows the proportion of grower who rely on each one often or always.
Soil testing is a sound and cost-effective practice that is used by nearly all growers. Future research to document whether leaf tissue and petiole testing are cost-effective and have clear benefits may be warranted to promote grower use of these tests, either on their own, or when offered by consultants.
The table below presents a list of fertilization methods along with the proportion of growers who use each one often or always. The substantial levels of adoption of several different fertilizer methods suggests that SSP-research has enhanced grower profitability by helping to identify and encourage the practices are the most effective.