It's unfair to compare industrial and consumer companies to tech companies since the demand for commodities such as energy and food will not grow nearly as fast as technology. We cannot expect an already saturated market to spend too much on Research.
What's the R&D spending on healthcare administration (e.g. hospitals/clinics)? The 'healthcare' sector spends the most on R&D, but I would imagine that is almost entirely because of pharma/biotech.