In the recent period, the authors have observed the symptoms of potassium deficiency in crops such as cotton, rice, corn, soybeans, and peanuts in several provinces and cities in the middle and lower reaches of the Yangtze River. In addition to the partial lack of potassium in the soil, the au…

The density of cage rearing is 10-30 per square meter, and the live weight of each individual is up to 0.4 kg in one year. It is less than 60% of the length of the live fish. Live shrimp can be used as bait. There are two feeding methods: One is to feed every day, saying that the regular f…