Building an annual 180,000 tractors and 700,000 diesel engines, there’s no denying the massive scale of Kubota’s manufacturing operation, especially in Japan and Asia. And it’s still growing. The global giant has plans in place for a 170hp tractor within the next two years, though for now the largest model in the range is the 103kW/138hp M135 GX — the subject of this month’s profi tractor test