1. The experiments were carried out in 1968 to know how growth of corn plants may be affected by planting pattern(planting method and spacing) and field management(intertillage, weeding and earthing) and to clarify the rationalization in farm work. The design of experiment is shown in Table 1.
2. According to the results of planting pattern, a reduction in the individual growth (plant hight, number of leaves, diameter of stems, leaf area and dry weight per plant) was found in the plot broadcast, compard with those in the plots of stripe sowing. In the plots of stripe sowing, above plant characters increased according as the space widen.
In the mass growth, on the cotrary, leaf area, dry weight and yield per unit area showed a tendency of the plot 30cm＞broadcast＞60cm＞90cm. While Relative Growth Rate and Net Assimilation Rate were the highest in the plot 90cm, the next in 60cm, the third in 30cm and the lowest in the plot broadcast as well as in the indnvidual growth.
These data indicate that 30-60cm rows space bring satisfactory result on yield. But 60cm row is better with due regard to the mechanization.
3. In the experiment of management, both the individual and the mass growth tended to show hign value in the plots of management. Comparing the first manage ment with the second one in this experiment, the former was better.
Much weed was observed in the non-management and wide spacing plots.
Above results suggest that once management(intertillage and weeding) at early stage of growth is enough.
4. According to the observation of lodging, as the earthing had little effect, it may be given as a conclusion that this work in the management can be dispensed.