With respect to the problem of growth duration, it was found that the length of growth duration of photoperiod-sensitive native varieties was influenced greatly by the time of transplanting and that the length of growth duration had a significant implication on growth and yield of rice in Thailand.
A further study was made on this problem from the standpoint of plant nutrition. Results proved that it is possible to produce comparatively small plants with high nutrient content by shortening the growth duration as a results of adjusting transplanting time, and thus, the nutritional conditions of plants in the latter growth period can be improved which is directly connected to increased yield.