I found a way to increase a self -sufficiency ratio in white paper. It says
To improve the food self-sufficiency ratio, in terms of production, efforts are made to strengthen production/supply systems compatible with changes in domestic and overseas demand and enhance domestic agricultural production bases.
In terms of consumption, efforts are made to deepen the connection between consumers and food and agriculture and collaboration with the food industry.
compatible with changes in domestic and overseas demand
I already mentioned that rice consumption is decreasing in Japan and a research institute developed rice varieties for bread.
But some agricultural products can not be grown in Japan due to limitations of climate. For example, tapioca has made a boom recently, but we can not grow such tropical crops in Japan.
The world of agriculture is not simple…