Metallurgy Machinery, Induction Melting Furnace for Copper Melting (YYT-RTL), China Metallurgy Machinery Yixing Sunny Furnace Co., Ltd. , https://www.yxyytyl.com
Photosynthesis is an important physiological process that affects the quality of production, while leaf area and chlorophyll content are important indicators for measuring photosynthetic capacity. The purpose of this experiment is to study the effect of S element on leaf area and chlorophyll, and provide a theoretical basis for the rational application of S fertilizer in production. The size of leaf area and the length of leaf functional period are important physiological indicators to measure the photosynthetic capacity of crops, and they are also a direct reflection of the effects of different treatments. Different S fertilizer treatment of leaf area per plant, application of S can significantly increase the size of the leaf area, and its effect is different in different growth stages. The leaf area tester showed that the leaf area at the seedling stage increased with the application of S, but only when the S fertilizer exceeded a certain level had a significant effect on the leaf area; the single plant leaf area at the flowering stage S was the highest at 556.13. In cm2/strain, the leaf area of ​​single plant treated with S decreased, but there was no significant difference between the two groups. However, the difference with S was extremely significant, that is, high S level inhibited the expansion of leaves during the period of seedling to full bloom. During the period of pod tillering, the inhibitory effect of high S treatment on leaf expansion turned into a promoting effect, and S treatment had the highest increase in leaf area from flowering stage to tillering stage. The level of chlorophyll content directly affects the strength of photosynthetic capacity. The chlorophyll meter proved that the changes in chlorophyll a, chlorophyll b, and total chlorophyll content of different S fertilizers during the whole growth period were slightly different. The S treatment indicators decreased slightly from the seedling stage to the full flowering stage, and then increased. It reached the highest value during the period of clams and began to decline thereafter. All the other treatments continued to rise from the seedling stage to the scab stage, the highest value of the scab stage, and then decreased. The effects of S fertilizer treatment on the contents of chlorophyll a, chlorophyll b and total chlorophyll were consistent. That is to say, all indexes of S treatment increased, and there was a trend of increasing with application of S, but S treatment had no effect at the seedling stage. With. With the advancement of growth period, the total amount of chlorophyll a, chlorophyll b, and chlorophyll in all growth stages after the flowering stage showed a significant increase with the increase of S application amount. However, the S treatment indicators differed during the flowering stage and the S stage treatment. The chlorophyll b content was slightly higher than that of wolfberry, and there was almost no difference in other periods.
The appropriate application of S fertilizer on the basis of soil fertility in this experiment can increase the green leaf area of ​​soybean, especially in the flowering stage, and can significantly increase the content of chlorophyll a, chlorophyll b and total chlorophyll in flowering stage to grain stage. The period from full flowering to the beginning of sowing is the initial stage of the transformation of soybean from a vegetative center to a reproductive center. To a large extent, it is still at the stage of vegetative and reproductive growth. There is still a higher intensity of photosynthetic product accumulation and consumption. Keep this The higher leaf area chlorophyll content can ensure higher photosynthetic capacity, prevent premature decline of leaves, provide more nutrients for grain development, and can also provide adequate nitrogen sources for quality formation, so as to achieve high yield and high quality creation. Material conditions.
Effect of S on the Growth of Chlorophyll and Leaf Area of ​​Crops
S plays an important role in crop photosynthesis. S is a chloroplast lamella lamella composed of S-lipids; it is an important component of ferredoxin and plays an important role in photoreduction and reduction of oxides. The organic S in the leaves is mainly concentrated in the chloroplast proteins of the mesophyll cells, so the supply level of S has an important influence on the formation and function of chloroplasts, and can significantly increase the chlorophyll content. S can increase the leaf area and specific leaf weight of corn and increase the content of soluble protein and photosynthetic pigment in functional leaves. However, deficiency of S results in poor development of chloroplast structure and increase of granule overlap. The overlap of granules is closely related to the activity of PsII. The study by Chen Qiu-fang also confirmed this point. The lack of S maize chloroplast PSII activity increased, and PSI activity decreased nausea. However, studies have also shown that S deficiency has no effect on photosynthesis in leaves.