Using the field plot test, set up four treatments, one for each species, three replicates for each species, and randomly arrange 36 tobacco plants in each plot. Each plant used 5 g of pure nitrogen as the base fertilizer. 1g was used as seedling fertilizer in 3 applications, and 3g was used as a topdressing fertilizer in the trenches for one-time application of N. The mass ratio of Pz05 to Kz0 was 1:1:2. Other measures and management were conducted in accordance with high-quality tobacco cultivation and management measures.
It has been considered that the chlorophyll meter reading has a very good linear relationship with the chlorophyll content of different leaf positions and maturity, and the correlation can be fitted with a force of y=ax+b. The sap value can be used to express the chlorophyll content. The level of chlorophyll spad in leaves of four flue-cured tobacco cultivars K326, Dahua Dajing, NC82 and Liaoyan No. 13 was determined by SPAD-502 chlorophyll meter. feature.
Flue-cured tobacco was started on the 7th week after transplanting ((0d), 6 consecutive times for every Sd ((0, 5, 10, 15, 20, 25d)) and 5 fixed cigarettes were taken from each experimental plot. Each cigarette was the same. One leaf (10th functional leaf removed from the bottom of the foot) was selected for listing. The SPAD-502 chlorophyll meter was used to measure the chlorophyll spad values ​​at the leaf base, mid leaf, and tip 3 positions. The relative change in pad value was calculated. Rate.spad value relative rate of change = (each measured pad value / first measured pad value) X100%.
The value of the padding value of different flue-cured tobacco leaves in the same location measured by chlorophyll meter was influenced by different parts, and it was also related to the time measured by the instrument. In the time range measured by chlorophyll meter, the leaf chlorophyll spad values ​​of K326, Dahua Jinjin, Liaoyan No. 13 and NC82 were the smallest at the leaf base and the largest at the tip of the leaf. The sap value of chlorophyll at the site of the determination was significantly different or extremely significant; in the last three determinations, there was no significant difference in the sap value measured by the chlorophyll meter at the same leaf position between the leaves of S. grandiflora and Liaoyan 13 and the leaf color was uniform.
The copper foil soft joining welding with argon welding and general fluorine Polymer Diffusion Welding. Argon arc welding is a welding technology using argon gas as a protective gas, also known as argon gas protection welding.Is in arc welding on the periphery of the argon gas protection, the air separation in the welding area, to prevent the oxidation of the weld area, this kind of welding with welding scars.High molecular diffusion welding is mainly through heating to a certain temperature to melt the solder, so as to the two kinds of materials or different materials together.
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