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Control methods: spraying urea from 0.2% to 0.3% of the leaf blade from 2 to 3 times, spraying once every 7 days to 10 days, with quick results, and watering in combination, and then applying urea in the soil.
Phosphorus deficiency symptoms are plant growth retardation, small leaves, leaf color is dark green, and gradually lost luster, and finally into a bronze, severe phosphorus deficiency when the leaves were dark purple, the old leaves first symptoms. The leaves become thicker and brittle, early defoliation occurs, yield is low, and quality is poor.
Control methods: spray the leaves with a concentration of 1% to 3% of the superphosphate leaching solution, spray about two times, or spray 0.2% to 0.3% of potassium dihydrogen phosphate solution at the root, usually spray twice, twice The spraying interval was between 7 days and 10 days to make up for it. The effect was quick and watering was connected with the application of diammonium phosphate in the soil.
Symptoms of iron deficiency are the young leaves at the top of the new shoot that first appeared yellowing and gradually turned white.
Control method: Spray the ferrous sulfate solution with a concentration of 1% to 3% on the leaves and spray them continuously 2 to 3 times, each time between 5 days and 7 days. A small amount of ferrous sulfate can also be added to the soil. Water fertilization.
1. Select a low-power controller. The controller will work 24 hours a day. If its power consumption is large, it will consume part of the power. A good choice is a controller that consumes less than 1 mA.
2. Select a controller with high charging efficiency. The controller of the MCT charging mode can automatically track the high current of the panel. Especially in winter or periods of insufficient light, the efficiency of MCT charging mode is about 20% higher than other charging modes.
3. Select the controller for bidirectional power regulation. Controllers with power regulation have been widely promoted. When there are few pedestrians at night, one-way or two-way lighting can be automatically turned off to save electricity. It can also adjust the power of the LED lights.
In addition to the above power-saving functions, attention should also be paid to the protection functions of the controller for components such as batteries. In addition, when setting the under-voltage protection value of the controller, try to adjust the under-voltage protection value to ≥ to prevent the battery from over-discharging.
Grape nitrogen and phosphorus iron prevention method
The symptoms of nitrogen deficiency are thin plants, fine branches, yellow-green leaves and yellow leaves. When chlorosis begins, the leaves begin to grow from the old leaves and gradually expand upwards. Even the leaves of the new shoots fall off, the fruits fall, the fruit pieces are small, and the shoots grow longer. Stopped early.