In the middle and late June, the fruit of grapes, pears and other fruit trees began to expand in the first rapid expansion period. When the flower buds are in the physiological differentiation stage, their root growth is rapidly absorbed and the function is prone to defatting. In this critical period, the appropriate amount of topdressing can supplement the nutrients needed for the tree to promote the fruit and promote the fruit to apply the nitrogen and phosphorus, potassium and trace elements of the whole yuan fertilizer and the special fertilizer for the fruit tree. Generally, the fertilization and fertilization amount is used throughout the year. 53% and try to combine irrigation and top dressing or rush to apply after rain and draw water and protect the phlegm while taking foliar spray fertilizer is more effective.
Summer fruit topdressing has the effect of promoting fruit enlargement and flower bud differentiation. There are two kinds of topdressing methods: under tree root application and foliar application.
First, the top of the top dressing. The summer topdressing of fruit trees should be based on phosphorus and potassium fertilizers and a small amount of nitrogen fertilizer. The amount of top dressing depends on the species, age, fruit weight and base fertilizer status. For saplings that have not entered the fruiting stage, each plant can be applied with 0.2-0.25 kg of phosphorus and potassium fertilizer. For the general results, each plant was topdressed with 2.5-3 kg of superphosphate, 10-15 kg of plant ash and 2 kg of ammonium sulfate. The method of topdressing is to apply a circular hole in the vertical line of the canopy to the inner 1 meter, and the depth of the hole is 30-40 cm. Conditional orchards are topdressed and then watered.
Second, foliar spray fertilizer.
Foliar spray application during fruit expansion has the effect of enhancing tree potential, promoting fruit enlargement and improving quality. The spraying concentration is 0.2% ammonium sulfate, 0.3-0.5% urea, 0.3% potassium sulfate, 1-3% calcium superphosphate, and 0.3% potassium dihydrogen phosphate. The effect of spraying on the leaves of mountain fruit is better.
Venous cannula is also a deep venous puncture catheter. The method is to select the appropriate puncture site and insert the needle under the skin, and insert the needle with negative pressure until the dark red blood is absorbed, indicating that the needle has entered the vein, and the guide wire is inserted. Withdraw the puncture needle to leave the guide wire in the blood vessel, and then insert the venous catheter that needs to be indwelled along the guide wire, then exit the guide wire, inject diluted heparin saline and fix the catheter, the deep venous catheterization is completed. The veins for puncture and catheterization are usually selected clinically, including the subclavian vein, internal jugular vein, and femoral vein. After the puncture catheter is indwelled, attention must be paid to the care of the puncture site to avoid infection with thrombus or catheter falling off.
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