What are the fertilization techniques from the Southern and Northern Dynasties to the Ming and Qing Dynasties?

During the Southern and Northern Dynasties, the principle of heavy fertilization was formed in vegetable planting. According to Yao Min's Book of Qi, vegetables are fertilized many times. During the Tang and Song Dynasties, China paid special attention to the maturity of fertilizers and the moderate application amount, which was then called "dung medicine". During the Ming and Qing Dynasties, special attention was paid to the application of base fertilizer and the "three suitability" in fertilization (timely, suitable place and suitable material), thus forming a set of traditional fertilization techniques in China.