I am guessing that you are not familiar with the inefficiency of agricultural land ownership regulation in Japan? Start by making it easier for corporations to own farmland and improve the per area output of the relatively little flat land that the country has (Japan is 73% mountainous[1])

Corporate involvement in agriculture is restricted by the Agricultural Land Law and related laws. Joint stock companies are permitted to participate in the farming sector in two ways. One is as “agricultural production corporations,” which can be established anywhere in the country and are allowed not only to lease farmland but also to acquire ownership rights. These corporations, though, are subject to various conditions, including that they derive over half of their sales from agriculture; that over three-quarters of the total voting rights are held by full-time farmers, farmland rights providers, agricultural cooperatives, and other parties involved in farming; and that full-time farmers account for a majority of the company’s directors. In addition, only joint stock companies that restrict stock transfers are eligible for this status. In short, this designation is for incorporated family-run farms, rather than for ordinary companies.

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At the time it was enacted, the Agricultural Land Law did not even envisage the possibility of farmland being owned or cultivated by corporate entities. [2]

Even the Agriculture Minister conceded this problem in 2008, but little has changed over the last decade.

At his inaugural press conference in September 2008, newly appointed Minister of Agriculture, Forestry, and Fisheries Shigeru Ishiba expressed his intention to reform Japan's farmland system in the following statement.

"I recognize that the biggest problem in Japanese agriculture lies, in fact, in the farmland system. The crux of the matter, to put it in extreme terms, is that we need a mechanism in which farmland becomes concentrated in the hands of those who are ready and willing to farm it, regardless of whether they are individuals or corporations. We have to put in place a farmland system that includes effective incentives to make this happen. This may raise fears that farms could be resold for speculative purposes or used as illegal dumping grounds, but we must focus on the sickness currently afflicting agriculture and must not lose sight of the way things ought to be. Another problem is that even though there are legal guarantees in place to ensure that farmland is not used for purposes other than farming, many aspects of this mechanism are, in reality, ineffective. I do not believe that such practices as having municipal leaders make recommendations on the use of farmland are truly effective in addressing this issue."

The first half of Ishiba's statement addresses the issue of corporate entry into the agricultural sector, which farmers' organizations have claimed will lead to joint-stock companies reselling farmland for residential or other development or using it for the illegal dumping of industrial waste. The second half addresses the problem that rules empowering municipalities to forcibly transfer unused land to other farmers in order to prevent the abandonment of farmland have become dead letters and do not fulfill their intended function.

[1] https://en.wikipedia.org/wiki/Geography_of_Japan

[2] http://www.tokyofoundation.org/en/articles/2008/let-corporat...

[3] http://www.tokyofoundation.org/en/articles/2008/the-issues-i...