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The benefit of having a large temperature difference between day and night during the growth period primarily relates to the promotion of the formation of shinpaku. Shinpaku refers to the core of the rice grain, which is rich in starch and is critical for sake production.

When temperatures fluctuate significantly between day and night, it can create a stress environment for the rice plants. This stress encourages the rice to invest more energy into developing starch reserves in the grains, resulting in a well-formed, high-quality shinpaku. The larger temperature variations can also enhance the process of photosynthesis during the day, as higher temperatures accelerate metabolic processes while cooler night temperatures can help with the stabilization and accumulation of nutrients, further benefiting the rice's overall quality.

Other possible benefits, such as increased pest resistance or enhanced soil moisture retention, are not directly linked to temperature variation but rather to other environmental factors or agricultural practices.