Accumulated temperature may be an unfamiliar term for many friends who raise dragons. Here we first explain what is called accumulated temperature. The growth and development of any crop requires certain warm conditions. Rice originates from tropical regions at low latitudes and is also a warm crop.But we know that both "warm" and "hot" are descriptive adjectives. To objectively and scientifically measure the warmth and heat, we must have specific purchase standards and standards.
Temperature is one of the most important factors that affect the growth and development of crops. Among them, "three base point temperature" is a measure of the temperature requirements of crops.The three-basis temperature of the stomach is the general term for the optimum temperature required during the life activities of crops and the lowest and highest temperatures that can be tolerated.Under the optimal temperature conditions, the crop has strong vitality and rapid and normal growth and development. When the minimum or maximum temperature can be tolerated, the crop will generally stop growing and developing, but it can still maintain life.If the temperature continues to decrease or increase, the crop will suffer until death.The lowest temperature for rice growth and development is 10-12 ℃, the highest temperature is 40-42 ℃, and the most suitable temperature is 20-32 ℃.Of course, the temperature at the three base points varies depending on the type of crop, growth period, and physiological conditions, and whether it is the highest, lowest, or optimal point is a temperature range.The lowest temperature that rice can tolerate from emergence, tillering and flowering is gradually increased, from the initial 10-12 ℃ to the later 17-20 ℃.In Singapore, there are peppers and red dragons. The timely sowing and harvesting of crops are also based on temperature changes.
Within a certain range, the higher the temperature, the faster the crop growth and development, and the shorter the time required to pass a certain development stage.It is conceivable that the accumulated value of daily temperature during this developmental stage may be relatively stable.Scientifically, the accumulated value of the average hot day temperature above a certain limit temperature in a certain period is called accumulated temperature.Accumulated temperature can not only measure the thermal requirements of a crop, but also evaluate the thermal resources of a certain area.
The accumulated temperature is divided into two types, one is called active accumulated temperature, and the other is called effective accumulated temperature.Most thermophilic crops need to be above 10 ℃ to grow actively, so the daily average temperature of 10oC is generally called the active temperature, and the cumulative active temperature can be obtained by accumulating the daily active temperature within a certain period.If the average daily temperature is 11, 9, 9, 12, 13 and 14 ℃ for 5 consecutive days, then the accumulated temperature of these five days is Il 10 0 10 12 10 13 10 14 = 50 ℃.Active accumulated temperature is often used to compare heat resources in different regions.However, the same biological zero degree should be adopted, for example, 10 ℃ is used as the biological zero degree.In agriculture, the difference between the active temperature of a certain crop and its biological zero degree is called the effective temperature. Similarly, by accumulating it daily, the effective accumulated temperature at this stage can be obtained.The biological zero degree of seed germination of japonica rice is 10 ℃, and that of indica rice is 12 ℃. If the temperature for 5 consecutive days is taken as an example, the effective accumulated temperature for japonica rice is 10oC, while for indica rice is only 3 ℃.
In contrast, the effective accumulated temperature can better reflect the heat requirement during rice growth. Different types of varieties require different effective accumulated temperature. As long as the geographical location and other external conditions do not change too much, the requirements for effective accumulated temperature of the same variety are usually stable的，有人曾研究过上海地区水稻早熟品种澄溪早，fish arowana其全生育期需大干 10 ℃ 的有效积温 1260 一 1280OC ，中熟品种原丰早、中秆早为 1360 一 1380oC ，晚熟品种广陆矮 4 号为 1420-1440 ℃ 。
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