Growth cycle of Japanese fine rice

The growth cycle of Japanese fine rice is about 100 days. Rice likes high temperature, high humidity and short sunshine, and is not strict with soil, especially paddy soil. The lowest temperature of seedling germination is 10 ~ 12℃, and the optimum temperature is 28 ~ 32℃. The average daily tillering period is above 20℃, and the optimum temperature for ear differentiation is around 30℃. Low temperature will prolong the differentiation of branches and spikelets. The suitable heading temperature is 25 ~ 35℃. The optimum flowering temperature is about 30℃, which is lower than 20℃ or higher than 40℃, which seriously affects pollination. The relative humidity should be 50 ~ 90%. The key period of fruit setting is panicle differentiation to full filling stage. The population with balanced nutrition and high photosynthetic efficiency is of great significance to improve the seed setting rate and grain weight. Heading stage needs a lot of water and mineral nutrients. At the same time, it is necessary to enhance the root activity and prolong the functional period of stems and leaves. It takes about 500-800 kg of water to form 1 kg of rice.