When applying manure and urine fertilizer, we should pay attention to drain the water in the lotus root field first, then apply it, and then pour back the right amount of water after applying it. And choose to fertilize in sunny days and do it at night, avoiding noon. Apply 4000 ~ 5000 kg of decomposed farmyard manure and compound fertilizer 100 kg per mu. After fertilization, turn over 20 cm to 30 cm, mix the soil and fertilizer evenly, and then level the bottom of the pool.
Nitrogen, phosphorus and potassium play a vital role in the growth and development of lotus root, but the dosage is a matter that needs great attention. If more nitrogen fertilizer is used, the lotus leaves will be thin and weak, and if less potassium fertilizer is used, the leaves will be small and premature, and the ability to resist pests and diseases and wind disasters will be poor. Old lotus field can use some nutrient fertilizer per mu, about 2500~3500 kg. You can also add some other nutrients appropriately, control it at about 30~35 kg, and plough deeply for 20~30 cm.
It is very important to apply base fertilizer to lotus root during the whole growth period. Generally, 2,500-3,000 kilograms of decomposed organic fertilizer and 60-80 kilograms of compound fertilizer are applied per mu, and trace elements such as copper, iron and zinc are difficult to meet the growth needs of lotus roots due to poor soil permeability, so less organic fertilizer is applied and more nitrogen fertilizer is applied. It is easy to induce physiological diseases. Under the condition of fresh lotus root 1800 kg per mu, lotus root absorbs about 7.7 kg of pure nitrogen, 3 kg of pure phosphorus and 1 1.4 kg of pure potassium from the soil, and the absorption rate of pure nitrogen, phosphorus and potassium by lotus root is about1:0.38:/kloc-0.