Detailed Explanation of Key Points of High-Yield Fertilization Techniques for Isatis indigotica

Isatis indigotica (woad) is a well-known medicinal plant. It has the effects of clearing heat and detoxifying, cooling the blood and soothing the throat, and also has antibacterial and antiviral effects and can improve immune function. In our daily lives, we often use it to prevent colds. However, when growing Isatis indigotica, fertilization is the key to achieving high yields. Below, follow the editor to take a look at the high-yield fertilization techniques for Isatis indigotica.

1. Apply sufficient base fertilizer

Before planting or when preparing the land, a large amount of slow-release or delayed-release fertilizer can be applied into the soil as base fertilizer. The base fertilizer is generally mainly organic fertilizer or farmyard manure, and an appropriate amount of nitrogen, phosphorus, and potassium compound fertilizer is also added, then plowed and buried into the soil. When planting, farmyard manure is generally used as the base fertilizer. Apply 3000-4000 kg of decomposed farmyard manure, 15 kg of diammonium phosphate, and 4 kg of biological potassium fertilizer per mu, spread them evenly on the soil, and then bury them by deep plowing.

2. Seed dressing fertilizer

Seed fertilizer, as the name implies, is fertilizer applied during sowing or when transplanting seedlings, mainly to increase the nutrients needed for seed germination or seedling growth. Among these methods, fertilizer can be mixed with seeds, dissolved in water and diluted to soak the seeds, or applied into the holes during sowing. For seed fertilizer, trace elements and organic fertilizer or granular fertilizer are generally selected. Fertilizers such as urea and ammonium bicarbonate should not be selected, as these fertilizers can easily burn the seeds and lead to failed germination.

3. Timely topdressing

Topdressing is fertilizer applied during the plant's growth and development period. When the plant grows vigorously, its demand for nutrients is relatively large. If nutrients are insufficient, its growth will be affected. Therefore, topdressing should be done in time at this point. Topdressing is generally mainly quick-acting fertilizer, so as to quickly supply nutrients and prevent nutrient loss. There are many methods of topdressing, including broadcast application, band application, watering application, and foliar spraying. For topdressing, the best choice is to combine organic fertilizer with chemical fertilizer. Apply 40-60 kg of organic fertilizer and 10-20 kg of compound fertilizer per mu, then cover with soil and compact it. After topdressing, try to choose the time before the rainy season, or water immediately after fertilizing.

4. Wintering fertilizer

If Isatis indigotica is sown in autumn, a wintering fertilizer needs to be applied once before overwintering, so as to prevent the plants from suffering cold damage, help them overwinter safely, and promote robust growth the following year. The wintering fertilizer should be applied before the soil freezes. Generally, barnyard manure is selected, and the fertilizer is spread directly around the plant roots, which can play a role in keeping warm. After the soil thaws in the following spring, break up the fertilizer and spread it flat.

The above is an introduction to the high-yield fertilization techniques for Isatis indigotica. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.