When are the early rice and late rice planted? What is upland rice?

Early rice in southern China is usually sown in early April, transplanted in late April and harvested around mid-July. Sowing of late rice in southern China is generally carried out at the end of June, the beginning of July, transplanting in the middle of July and harvesting in the middle of 10.

Upland rice, commonly known as upland rice, is drought-tolerant and suitable for dry land planting, also known as upland rice, which refers to cultivated rice that can adapt to the growth in boundless dry land, sloping land and arid ecological environment and is a variety of rice.

Determine the sowing date of early rice: when the temperature is stable at 12 to 14 degrees Celsius, it is the lowest temperature for rice germination and growth. Under natural conditions, the daily average temperature is higher than the daily average temperature and lower than the daily average temperature at night. The daily average temperature of 65438 00 degrees Celsius and 65438 02 degrees Celsius are the lowest temperatures for the growth of japonica rice and indica rice, respectively.

The suitable sowing date of early rice is: the daily average temperature is higher than 65438 02 degrees Celsius for three consecutive days, and the suitable sowing date in the Yangtze River basin is from late March to early April. With the increase of latitude and altitude and the decrease of temperature, the sowing date will be postponed. In production, we should pay attention to the weather forecast at that time, and seize the "cold tail and warm head" to grab sunny sowing. Take advantage of the sunny and warm weather after sowing, so that the roots of seeds can be planted early. When the cold air comes for the second time, the seedlings have taken root and become seedlings, and will not be damaged by low temperature, resulting in rotten seeds and buds.

Late rice is 150 ~ 170 days. Early rice generally has a big belly, less hard grains, loose rice quality and poor quality, and late rice quality is better.

Upland rice seeds need more oxygen, stronger water absorption and less water demand to germinate, and germinate faster than rice at 65438 05℃. The bud sheath is short, the middle stem is long, and the first and second intact leaves are large, which is highly toxic to potassium chlorate. Upland rice has a large proportion of thick roots, developed roots and deep distribution. The taproot produces uniform fine roots with high root cap and strong drought resistance.