A: The root system is the main part of the absorption of fertilizers, and the branches of the leaves can also absorb fertilizers. Therefore, fertilization includes fertilization, foliar application, and branch injection. There are many stomata on the back of the leaves, and the ability of sucking fertilizer is strong. Therefore, the foliar spraying of fruit growers should pay attention to the uniform and even spraying of the front and back sides of the leaves. After the leaves are sprayed with fertilizer, the leaf function is greatly improved after more than 20 minutes, and it can last for 1 to 2 weeks. Therefore, fertilizer should be sprayed once in two weeks. The stem injection is to inject the fertilizer solution into the tree body and transport it to the various organs of the tree body through the transport tissue of the tree body, so as to achieve the purpose of stimulating growth, increasing yield, and improving fruit quality.
Roundness Measuring Instruments
Roundness meter is a length measuring tool for measuring roundness using the rotary axis method. The roundness meter is a measuring tool for measuring the roundness error of the workpiece using the rotary axis method. Roundness tester is divided into two types: sensor rotary type and workbench rotary type. During measurement, the measured part is installed concentrically with the precision shaft system, and the precision shaft is attached with an inductive length sensor or a workbench for precise circular motion. It is composed of sensor, amplifier, filter and output device of the instrument. If the instrument is equipped with a computer, the computer is also included in the system.
The principle of the roundness meter is the same as that of the coordinate measuring machine. In fact, its working principle is very simple. The coordinate measuring machine is a point acquisition tool. Its principle is to collect points first, and then form a line from points, and then form a three-dimensional model from lines. CMM is a kind of measuring equipment that has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable that can place the workpiece (not necessarily large or huge). The measuring head can be moved to the measured point easily by manual or motorized means, and the coordinate value of the measured point is displayed by the reading device and the digital display device. Obviously, this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate value of any point in the measured volume can be displayed through the reading device and digital display device.
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