Detailed Explanation of Key Points of Fertilizer Spraying Technology for Cherry Cultivation

(1) Fertilizer spraying timing: Foliar fertilizer can be sprayed from after the cherry tree sprouts until before maturity, and even before leaf fall;

(2) Fertilizer types: Any nutrient elements required by crops can be used as fertilizer spray types;

(3) Purpose of fertilizer spraying: It is to supplement fertilizer to cherry trees through foliar spraying;

(4) Specific fertilizer spraying techniques and types introduction:

A. Sprouting stage to flowering stage fertilizer spraying: Focus on spraying fertilizers that promote flower bud differentiation and promote pollination and fruit set, boric acid aqueous solution and agents for preventing flower rot, frost damage, heat damage, viral diseases, etc. Commonly used foliar fertilizers:

Formula 1: 50 g boric acid, 50 g zinc sulfate, 20 g antifreeze agent or Tianda 2116 at 300 times dilution, 0.2 jin brown sugar, add 15 kg water (one sprayer volume of water) and spray the whole tree; the purpose is to supplement boron and zinc elements for cherry trees. Boron element can promote flower bud opening, promote pollination, increase seed content in fruit, and prevent deformed and misshapen fruit; zinc element can prevent the occurrence of various viral diseases; antifreeze is to prevent frost damage and prevent flower buds from being frozen;

Formula 2: 20 g viral DNA generation II, 20 g organic silicon calcium, 50 g brown sugar, add 15 kg water, mix thoroughly and evenly, spray the whole tree. The main purpose is to prevent flower rot, viral diseases, prevent low-temperature cold damage and frost damage, promote flower bud opening and promote pollination and fruit set;

B. Flowering stage: Generally, it is not suitable to spray fertilizers and agents. If encountering low-temperature cold waves, you can spray antifreeze agent and brown sugar aqueous solution in the afternoon to prevent frost damage. The concentration of brown sugar spray is: add 100 g brown sugar and 40 g antifreeze agent or Tianda 2116 at 300 times dilution to 15 kg water, fully dissolve and evenly spray the whole tree. If the temperature on that day is below 4 degrees, you can add 50 g milk powder to the solution, but it must be fully dissolved.

The optimal pollination temperature for cherry trees during the flowering stage is 18-22OC. When it exceeds 23OC, the petals will be damaged, and the pollen will lose activity or even die, seriously affecting pollination and fruit set, causing a large number of deformed fruits, affecting yield and quality, and reducing yield and income. The prevention method is that once encountering high temperatures above 23OC, immediately on the afternoon of the high-temperature day at 3-4 o'clock, carry out a comprehensive spray of edible vinegar aqueous solution on the cherry trees for detoxification treatment. The method is: 100 g edible vinegar, 40 g decay quick health or 20 g organic silicon calcium, add 15 kg water, stir evenly, spray the whole tree, which can prevent and relieve flower withering caused by heat damage, pollen death, failure of pollinated fruit to set normally, and leaf scorching, etc.

C. Rapid fruit expansion stage: From 5-7 days after cherry tree flowering to within 15 days is the first rapid fruit expansion stage of cherry trees. This period is the most vigorous period of vegetative growth and reproductive growth of cherry trees. Leaves, branches, fruits, seeds, roots, trunks, etc. grow rapidly simultaneously, and it is also the best period for cherry trees to absorb nutrients from the soil. Nutrients from the roots are continuously transported to the fruit and the whole plant. During this period, the climate is not very stable, and the growth of branches, leaves and fruits is very easily affected by climate. Any high temperature and low temperature will bring adverse effects on the growth of the fruit and the whole tree, but it is also the best period for foliar fertilizer spraying. In order to prevent any factors that may be unfavorable to the growth of cherry trees, foliar fertilizer should be sprayed in time.

Formula 1: Tianda 2116 at 800-1000 times dilution, evenly spray leaves and fruits, can promote rapid fruit expansion and prevent sudden low temperature and high temperature;

Formula 2: 20 g viral DNA generation II, 20 g organic silicon calcium, 20 g fruit expansion king, add 15 kg water, mix evenly and spray leaves and fruits. The main effect is to prevent viral diseases and fruit rot;

Formula 3: 500 g lime powder, add 15 kg water, soak for 4 hours, take the supernatant, add 10 g monosodium glutamate to the supernatant, stir thoroughly and evenly, pour into the sprayer, add enough water, evenly spray the whole tree, which can play a role in protecting leaves.