The role and disadvantages of calcium supplementation in watermelon
First, the role of watermelon calcium 1. Promote the development of watermelon roots, accelerate the germination speed, and help the watermelon to spread leaves. 2. Improve the disease resistance of watermelon and reduce the use of pesticides . 3, is conducive to the development of watermelon fruit, uniform size, no cracking fruit. 4, improve the texture of watermelon fruit, not easy to soften, good taste. 5. Improve the storage stability of watermelon and extend the shelf life. 6. Conducive to the development of roots and shoots of watermelon plants. 7. Increase the thickness of the cell wall and reduce the incidence of diseases such as blight and anthracnose. 8. Improve the hardness of the fruit and reduce the occurrence of umbilical rot. 9. During the expansion period of watermelon, the cell wall of watermelon plants can be stabilized, and the pectin adhesion between fruit cells can be increased, so that the cell wall will not collapse when the fruit is expanded, and the carbon frame will not be scattered. 10, in terms of growth, to a certain extent, you can control the top advantage and prevent the leader. Second, the drawbacks of traditional calcium fertilizer application methods 1. Many fruit farmers use calcium fertilizers such as calcium nitrate and compound fertilizers to supplement calcium in watermelons, but it is necessary to know that if these mixtures are used, calcium phosphate precipitation will be formed, thereby reducing the absorption of calcium and phosphorus by watermelon plants. Therefore, when using fertilizer, you should avoid mixing the two. 2. The use of calcium fertilizer alone will increase labor costs. Third, watermelon full fertilization recommendations 1. When transplanting Use root care nutrient solution 2-3kg + water 300-500 times per acre. 2, growth period 7-10 days after transplanting, drip or drip is applied per acre with calcium-containing agent. 3, the current bud flowering period Drip or drip with 5-7kg of calcium-containing agent per acre. 4, fruiting period When the fruit has the size of two thumbs of an adult, drip or drip is applied once per acre with 10 kg of calcium-containing medicament. 5. Mature period Before the fruit is harvested, drip or drip is applied per acre with 10 kg of calcium-containing medicament.
100LEDs Crystal Ball Solar LED Outdoor Garden Christmas Decoration Waterproof String Light.
The solar lamp is charged during the day and automatically lights up at night because there is a voltage detection circuit inside the lamp, which detects that the voltage of the solar panel is high during the day, and the detection circuit outputs a control signal to turn off the lamp, and the voltage of the solar panel is almost zero at night. , the detection circuit outputs a control signal to light the lamp. Below we introduce a simple and easy-to-make automatic control circuit for solar lamps. As long as the circuit is added with a solar panel and a rechargeable battery, a solar lighting lamp can be formed.
During the day, due to the high voltage of the solar panel, the â‘ pin of the IC is high level, the output of its â‘¡ pin is low level, the N-channel MOS field effect transistor VT is turned off, and the LED light connected to its drain does not light up. At night, the voltage of the solar panel tends to zero volts. At this time, the â‘ pin of the IC is at a low level, and its output becomes a high level. By adjusting the potentiometer RP, the lamp can be lit in a suitable light. VT can choose AO3400 SMD MOS field effect transistor in SOT-23 package.
Solar Crystal Light,Waterproof String Light,LED Outdoor Garden Christmas Decoration Dongguan XINYUDA Technology Co., Ltd. , https://www.gdxige.com