In 1791, he ordered the planting of extensive windbreaks to improve on crop yields, and from 1792 also developed sericulture and lacquerware as industries to increase the revenues of the domain, bringing in experts from around the country.

From 1793 he began a program to increase rice production by redeveloping unused land, seizing it from recalcitrant retainers when necessary.

From 1795, he reformed the domain's system of local magistrates to remove incompetent or corrupt individuals.

In 1807, the Russian-American Company landed on Iturup island in the Kuriles, attacking the Japanese garrison.

Kubota Domain was ordered to reinforce the defenses of Ezo and the northern islands and Yoshikazu sent a detachment of 600 men.