The first crops planted by the chinese were saplings and rice, which originated from ancient crops in china or east asia, and rice cultivation history dated back about 12,000-16000 bc. The platinum is the main planting crop in the yellow river basin of the neolithic era. It is a herbal, dog-tailed and one-year-old plant. Rice is a rice grain crop. It is a year-old crop that likes high temperatures, wetness and short-day photographs and is less demanding for soil。
I. The first two crops planted by the chinese
1. The first two crops to be cultivated by the chinese are aluminum and rice, which are ancient crops originating in china or east asia and have a long history of cultivation. The cultivation of rice dates back to hunan, china, about 12,000-16000 bc。
Snack is the main growing crop in the yellow river basin of the neolithic era, and pre-historic and archaeological food crops in the yellow river basin are predominantly its main crop。
3 the grasshopper is a herbal, dog-tailed plant, a one-year plant with a thicker mustard root and a smaller plant, usually 20 to 70 cm tall。
4- rice is a rice crop, which is a year-long crop, with a straight line, usually 0. 5-1. 5 metres high, and a looser leaf。
5. Rice prefers high temperature, wetness and short-day photos, with low soil requirements, the lumber temperature of paddy seedlings at 28-32°c is more appropriate, the spectrometer temperature is more appropriate at 20°c or above, and the estuarine temperature is better at around 30°c。
Impact of long-term growth on crops
1. During a year's visible period of crop growth, known as the life season, there is a close link between the long-term and the temperature conditions, known as the long-term during the period when growth can continue at a certain temperature or more。
2. The length of life in the long term largely determines the northern limit of crop distribution, and the shorter the crop, the higher the latitude and altitude at which it can grow and develop。
3. Crop growth cycles are longer and their quality is relatively higher, as they are longer, with longer periods of light and higher quality. The length of the growth cycle is affected by the duration of the light, which can seriously affect crop yields and quality。
The long-term life of crops is the number of days in which crops can grow, and the longer they start to grow at temperatures of 5-6°c and the longer they take, the longer they accumulate organic matter, the better they can absorb more nutrients。
