What are the characteristics of dryland farming in ancient northern China?

North China refers to the middle and lower reaches of the Yellow River? Due to the low rainfall and uneven distribution, the dry land in northern China was often threatened by drought, which was one of the important reasons for the low and unstable agricultural output in dry land?

Drought-resistant farming plays an important role in developing dryland agriculture in northern China?

Ancient ancestors accumulated rich experience in long-term drought-resistant farming, and created farming techniques suitable for moisture conservation and drought prevention in the north, such as deep ploughing, breaking ground, raking shallow and shallow tillage?

Shennong is an ancient mythological figure in China, and is recognized as the god of agriculture by the people? Legend has it that Shennong cultivated "five grains" and taught people how to cultivate, thus opening a precedent for agriculture in China?

The annual rainfall in the northern region is relatively small and the distribution is not sharp. Its main feature is windy and dry in spring, and the rainfall is mainly concentrated at the turn of summer and autumn. Spring is an important season for planting long seedlings, and there is a great demand for rainwater? In this way, drought prevention has become the most prominent problem in agricultural production in the northern region?