Grafting and seedling cultivation is a commonly used method for protecting vegetables in recent years. It can improve the disease resistance of plants and increase the yield. The following points should be noted during the operation.
There are great differences in drought tolerance, cold resistance, and disease resistance among different rootstocks of suitable rootstocks, and the corresponding rootstocks can be selected according to the purpose and method of cultivation. Such as cucumber grafted seedlings in winter, can use low temperature, good stretch of Yunnan black seed pumpkin as rootstock.
Select the appropriate method of vegetable grafting methods are docking, splicing, docking and so on. Plugging and splicing are performed before and after breaking the seedlings and are mainly applied to melon vegetables. Among them, the scion seedlings are small and the hypocotyls are mostly used for plugging; the scion seedlings, the thickness of the hypocotyls and the rootstock are similar to each other by the method of connection. The splicing method is used when the rootstock is large or even mature, such as the eggplant and other vegetables. In the production, the grafting method should be selected flexibly according to the level of mastery they have, the type of vegetables, the grafting period, the ease of management after grafting, and the operation conditions at the time of colonization.
Determining the timing of sowing for rootstock and scion should be based on the growth characteristics of both and the grafting method to be used. When cucumber and black-skinned squash are grafted by grafting, black-skinned squash should be planted 5 to 7 days earlier than cucumber; when grafting is used, cucumber should be sown 5 to 6 days earlier than black-skinned squash.
After grafting, management of the grafted bed needs to maintain the relative humidity of the air above 90%. Therefore, the seedbed should be poured with bottom water and covered with a small shed. In order to prevent the temperature in the booth from being too high, it should be shaved for 3 to 7 days. When the young leaves of the seedlings are not wilting or new leaves are growing out, the seedbed can be moderately ventilated and cooled, and the light can be gradually increased. After 8 days of grafting, the shelter can be completely removed and the normal management can be performed.
Everything You Need To Know About LED Lighting
LEDs are a simple invention with huge potential to change the lighting industry for the better. Don`t know much about them? Here are three big things you need to know to get your feet under you:
1.What Does LED Stand For?
2.LED stands for light-emitting diode.
A diode is an electrical device or component with two electrodes (an anode and a cathode) through which electricity flows - characteristically in only one direction (in through the anode and out through the cathode). Diodes are generally made from semi-conductive materials such as silicon or selenium - substances that conduct electricity in some circumstances and not in others (e.g. at certain voltages, current levels, or light intensities).
2.A light-emitting diode is a semiconductor device that emits visible light when an electrical current passes through it. It is essentially the opposite of a photo-voltaic cell (a device that converts visible light into electrical current).
Did You Know? There is a similar device to an LED called an IRED (Infrared Emitting Diode). Instead of visible light, IRED devices emit IR energy when electrical current is run through them.
1.How Do LED Lights Work?
2.It`s really simple actually, and very cheap to produce, which is why there was so much excitement when LED lights were first invented!
The p-type and n-type materials are created by introducing the original material to atoms of another element. These new atoms replace some of the previously existing atoms and in so doing, alter the physical and chemical structure. The p-type materials are created using elements (such as boron) that have less valence electrons than the intrinsic material (oftentimes silicon). The n-type materials are created using elements (such as phosphorus) that have more valence electrons that the intrinsic material (oftentimes silicon). The net effect is the creation of a p-n junction with interesting and useful properties for electronic applications. What those properties are exactly depends mostly on the external voltage applied to the circuit (if any) and the direction of current (i.e. which side, the p-type or the n-type, is connected to the positive terminal and which is connected to the negative terminal).
Application of the Technical Details to LED Lighting:
When a light-emitting diode (LED) has a voltage source connected with the positive side on the anode and the negative side on the cathode, current will flow (and light will be emitted, a condition known as forward bias). If the positive and negative ends of the voltage source were inversely connected (positive to the cathode and negative to the anode), current would not flow (a condition known as reverse bias). Forward bias allows current to flow through the LED and in so doing, emits light. Reverse bias prevents current from flowing through the LED (at least up until a certain point where it is unable to keep the current at bay - known as the peak inverse voltage - a point that if reached, will irreversibly damage the device).
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