Abstract
We must pursue the possibility of a large scale paddy farming in order to cope with import liberalization of rice, the price fall of the independence circulation rice under the new food law, and so on.
As agricultural machineries have adbanced in high-performance at the present time, For realization of the large scale paddy farming, how to mechanize and lighten farm workings, such as raising of seedling, conveyance of many trays to nursery, mowing of balk, control, water management and so on, are important problems.
Even if it could shorten the workings, it is unable to avoide that a lot of work concentrate at the period of transplanting and harvesting in the paddy field, which is a obstructive factor to enlarge the scale of farming.
Fortunately, it's enough warm to make early season culture of rice in the southwestern warm region of Japan, so combination of early season and normal season cultures of rice makes a lot of work disperse.
In the warm region, the reduction of the number of needful seedling trays by introduction of sparse planting culture seems to be quite effective in lightening the labor for raising of seedling and conveyance of the trays to nursery.
Futher, to leave rice plants standing in the paddy field after their maturing stage makes possible to harvest not only in autumn but also in winter.
It is suggested that establishing these methods largely contribute to realize a large scale paddy farming of rice for the 21th century.
