April is the key period for navel orange management, navel orange management should be good fertilization, pest control.
Applying good fertilizer
All navel orange trees will be topped off by the end of April before mid-April to ensure that the tree needs nutrients. General production of about 200 pounds of navel orange trees, application of organic fertilizer 12-16 kilograms, and with more than 40% of NPK fertilizer 6-10 pounds; for old trees, weak trees, can be appropriate to increase the urea 1-2 pounds .
In areas with zinc deficiency, boron deficiency, and magnesium deficiency in the navel orange tree, foliar fertilizers such as zinc sulfate, magnesium sulfate, and boric acid may be sprayed on the leaves in early April. When the leaf fertilizer is sprayed, the back of the leaf blade is also wetted.
Pest control
In April of each year, it is also an active period for insect pests such as leafhoppers and malignant leafhoppers of the navel orange tree, and it needs to be prevented and controlled in advance.
In order to prevent red-yellow spiders, leafhoppers, and malignant leafhoppers (aphids) from damaging the pollens and buds, before flowering or when they spend 2/3, they use 10% imidacloprid 1200-fold or 2.5% chlorofluoro cyanide. Chrysanthemum 2000 times or 1.8% abamectin 2000 times spray. However, during the flowering period, try not to fight drugs.
In order to prevent non-leaf shoots from absorbing more nutrients, stems and leaves without inflorescences should be cut off. Hanging one yellow sticky board every 3 plants is higher than the canopy or hanging on the upper part of the canopy that is not sheltered from the protruding shoots.
electronic thermometer,thermometers electronic digital,non contact thermometer:thermometer
Shenzhen Urion Technology Co., Ltd. , https://www.urionhealth.com