What kind of fertilizer is good for Isatis root base fertilizer (base fertilizer application method)

Effect of Isatis root fertilizer

The base fertilizer applied to Isatis root contains a high content of organic matter, and is rich in nitrogen, phosphorus, potassium and trace elements, which can meet the growth needs of the plant, and can also improve the structure and physical and chemical properties of the soil, loosen the soil, and promote the growth, development and yield of Isatis root.

Selection of Isatis root fertilizer

The best base fertilizer for Isatis indigotica is a compound fertilizer with high nitrogen, medium phosphorus and low potassium. If there is no compound fertilizer with this content, choose a similar one or formulate it in a similar proportion.

How to apply Isatis root fertilizer

When planting isatis root, sufficient base fertilizer should be applied. Spring sowing should be in early April, and summer sowing should be in late May. May to June is the period of vigorous growth, and the demand for fertilizer is relatively high at this time. Fertilizers containing nitrogen, phosphorus and potassium can be applied in time. During this period, fertilizers and water must be managed scientifically and reasonably.

Mix the above fertilizers and spread them evenly between the rows of Isatis root. The fertilizers should be spread 5-10 cm away from the roots of the plants to avoid burning the roots of the Isatis root.

How much isatis root fertilizer to put

The base fertilizer for isatis root is about 2,500 kg per mu. If there is enough manure, it can be increased to 3,000-5,000 kg per mu. When manure is insufficient, diammonium phosphate and potassium chloride can be added per mu.

How to apply fertilizer to Isatis root

In order to provide sufficient fertilizer to Isatis root, timely topdressing is also needed. 45 kg of cake fertilizer or 450 kg of decomposed human manure can be applied per mu. In early July, after the leaves of Isatis root are harvested, topdressing should be applied again according to the above method to provide sufficient nitrogen, phosphorus and potassium fertilizers for its growth.