However, the types and functions of peaches in the flat peach garden are very intriguing. According to the land introduction, there are 3,600 flat peaches in the flat peach garden: "There are flat peaches 1200 in front, with small flowers and small fruits, which have been cooked for 3,000 years. People become immortals, and their physique is light; Among them, there are 1200 plants with sweet flowers and cooked for 6 thousand years. When people eat Xia Ju, they can fly high and live forever. There are 1200 plants with purple patterns behind, which have been cooked for 9000 years. People eat it, life is like heaven and earth, and the sun and the moon are the same. "
It can be seen that flat peaches can be divided into at least three categories. The first-class flat peach has been cooked for 9 thousand years, which has the effect of longevity with the world.
The time when a flat peach matures once is called the growth cycle. Growth cycle refers to the time required for a crop from sowing to harvesting, that is, the time required for it to mature once. It is not difficult to see that with the extension of the growth cycle of flat peach, its efficacy is getting bigger and bigger. This characteristic of flat peach has a certain shadow in real agricultural production. The longer the growth cycle of the same crop, the better the quality. This is because the longer the growth cycle, the longer the time for crops to accumulate nutrients and absorb trace elements in the soil.
For example, northeast rice is synonymous with high-quality rice, and Wuchang and Jiansanjiang are both famous green rice capitals. From the picture, Jiansanjiang is located in the east of Heilongjiang, where the latitude is high, the temperature is low and the rice growth cycle is long. Winter is cold and long. When snow melts, it can freeze pests to death, and there are few pests and diseases. Coupled with soil reasons, it has become the origin of high-quality rice.
Except for the northeast, the only place with a long crop growth cycle is the Qinghai-Tibet Plateau. The average altitude of the Qinghai-Tibet Plateau is as high as 4,000 meters, and the climate is extremely cold, so it is difficult to grow crops. In low-altitude valleys, such as the Yarlung Zangbo River basin, crops that can withstand temperature and cold, such as highland barley and wheat, can be planted. The highland here is high, the temperature is low, the crop growth cycle is long, the temperature difference between day and night is large, and the highland barley produced is of good quality. Although the health care efficacy of these high-quality agricultural products cannot be exaggerated like flat peaches, it is very rare for human beings. The rice in Jiansanjiang and highland barley in Yarlung Zangbo River have one thing in common: high dietary fiber and vitamins, and more trace elements such as calcium and phosphorus.
Growth period and crop growth cycle are often confused. Growth period refers to the period during which plants can grow. Usually, when the temperature is ≥ 10℃, many crops can grow actively. Journey to the West called the Flat Peach Garden "when the flowers bloom, it will ripen for a thousand years, and there will be no summer and no winter", that is to say, all the time is the growth period. This is of course an ideal situation. In fact, the tropical rain forest area near the equator can only appear where it grows all year round. For the eastern part of China, the growing season is longer as it goes south, for example, the growing season south of Nanling is as long as 320 days. The growth period is closely related to the frost-free period. The longer the frost-free period, the longer the growing period. The following picture shows the distribution map of frost-free period in China.
As can be seen from the above picture, the farther south, the longer the frost-free period. Northeast China and Qinghai-Tibet Plateau have short frost-free period and short growing period. Where the growth period is long, the growth cycle of crops is often short, and the time for crops to accumulate nutrients is also short. Where the growth period is short, the growth cycle of the same crop is often longer and the quality is better.
Of course, it is difficult to compare different crops, after all, it is related to the crops themselves. This is like, from the growth cycle alone, the ginseng fruit in Yuanwuguan Village of Daxian Town is longer than the longest flat peach in the flat peach garden. "Bloom in three thousand, bear fruit in three thousand, and mature again in one thousand. It's still ten thousand years away, only thirty. " Although it takes a long time to mature and the quantity is extremely rare, people can only live for four or seven thousand years if they eat one, which is obviously far from the effect of "immortality" and "longevity with the world" of flat peaches, and even far less than the flat peaches that have been cooked for three thousand years.