The test method was as follows: 1.1 Immediately after the leaves were taken, the area of ​​each leaf was measured with a leaf area meter. 1.2 Each leaf is accurately drawn on a thick and even paper, and the actual area of ​​each leaf is calculated using the paper weighing method (this method is time-consuming, but with high accuracy), and it also accurately determines each Leaf length and width, length from leaf base to tip, leaf width at the widest point of the leaf. 1.3 The area of ​​each leaf was determined by a grid plate (the checkerboard was made of coordinate paper). Finally, a statistical analysis was performed using a Pc-1500 microcomputer.
From the results of the measurement, the difference between the area of ​​the persimmon leaves measured by the checkerboard (containing 100 grids per square centimeter) and the leaf area meter was not significant, so these two methods All of them are suitable for the determination of the single leaf area of ​​the persimmon tree, and the error of the grid plate measurement result is smaller. Therefore, when using these two methods, it can be selected according to the number of blades to be measured and the required accuracy. In addition to the above, we have also made a significant difference in the determination of the single leaf area of ​​persimmon trees using the simple linear regression equation (x for length x width) and multivariate linear regression equations obtained from this experiment, the grid plate method and the photoelectric leaf area meter method. The results of the determination and analysis showed that the differences between the two regression equations and the measurement results of the grid plate and the leaf area meter were not significant.
Left-hand full-thread bolt
Left-handed full-thread bolts are mainly used in mines where rock formations such as coal mines are not hard enough. bolts are generally used together with anchoring agents to achieve end anchoring or full anchoring in mines.
ANTO left-handed full-thread bolt is made of high-strength HRB500 or HRB600, which can provide high load-bearing capacity to protect mine safety.
Compared with other bolts, it can be installed using ordinary foreign drilling rigs, which saves installation costs.
Anto left-handed full-threaded anchor rod, the threads are distributed throughout the rod body, increasing the moving length of the nut, if the anchor rod support is loose in the later stage, tighten the nut, and the anchor rod restores the support force.
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