Four methods of fertilization for planting pollution-free cherries

1. Radiation trench or ring trench method: the radiation trench method is dug outward at 50 cm from the tree trunk, narrow and wide inside, shallow inside (30 cm) and deep outside (40 cm to 50 cm). The ditch length extends to 20 cm outside the projection of the crown, with 4 trenches per plant. The ring trench is dug at the projection of the crown, 50 cm wide and 40 cm deep. In both methods, the fertilizer is evenly sprinkled and mixed with the soil to avoid burning roots. Cover the soil and water after application, or apply it when the soil moisture is good after rain.

Second, spread in the whole garden: this method is suitable when the root system is all over the garden. Spread the fertilizer evenly into the garden and turn it into the soil. because of the shallow application (about 20 cm), it is easy to cause the root system to float and reduce the resistance of the root system to the adverse environment. It is best to use alternately with radiation ditch method or ring ditch method.

Third, hole storage of fertilizer and water: dig a hole with a depth of 35 cm and a diameter of 30 cm outside the crown, add a grass handle with a diameter of 20 cm and a height of 30 cm, 5 cm below the ground, put it into the hole, and then irrigate 4 kg of nutrient solution. The number of holes depends on the size of the crown. Generally, each tree dug 4-6 holes, then covered with plastic film, poked a small hole in the center of the hole, fertilized (dissolved by adding water) and watered through the hole. Usually sealed with stones to prevent evaporation, because the hole is 5 cm below the ground; when it rains in the open air, Rain Water can circularly flow into the cave. If it does not rain, pour 4-5 kg of water every 20 days or so, and stop irrigation after entering the rainy season. Compared with the general soil topdressing method, it can reduce the use of fertilizer by half, which is economical and effective, and has great effect on increasing production. More efforts should be made to popularize it in protected cultivation.

Foliar topdressing: foliar topdressing in growing season is an effective auxiliary fertilization method, which has the advantages of labor-saving, fast absorption, uniform distribution, high utilization rate and so on. The suitable concentration of ① for cherry foliar spraying is 0.3% urea. The concentration of ammonium phosphate and potassium phosphate is 0.5%-1%. The concentration of potassium chloride and potassium nitrate is both 1%. ② spraying period and spraying time: it can be used from the beginning of cherry leaf expansion to before the leaf stops growing, and it can be replenished in time during the critical period when cherry needs fertilizer. It is suitable to be carried out before 10:00 and after 16:00 in summer to avoid drug damage caused by evaporation too quickly. ③ spraying times: generally every 15 to 20 days spray, can be combined with pesticide spraying at the same time, put fertilizer in pesticide spray together. ④ usage: the fertilizer can be directly added to water according to the required concentration, and then dissolved can be sprayed. Spray should focus on the back of the leaf surface, because the back of the leaf is less horny and easy to absorb.