Leaf area meter for determination of loquat leaf area

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The nutritional value of alfalfa is very high. It is a kind of herbal medicine used for both herbs and grains. The leaves are the main organs for the photosynthesis of alfalfa. In order to provide some guidance for its production, there must be some research on the growth of the leaf area. It is of more positive significance to formulate high-yield, high-quality, high-efficiency cultivation technology measures. There are many methods for measuring leaf area, such as leaf area meter, gravimetric method, length-width coefficient method, regression equation method and so on. For Gramineae crops, because the shape of the leaves is relatively regular, the long-width coefficient method is relatively simple and easy to use, but it is most commonly used, but its accuracy is affected to some extent by the K value of the blade shape and the correction factor.

Through the leaf area meter, it was found that the leaves of different varieties and leaf sequences not only differ in size but also have different specific leaf area (SLA). In general, the ratio of the upper leaves to the main stem, the leaf weight is larger, and the base leaf is lower. With the increase of habitat, the leaves tend to thicken; whether it is the main stem leaves or branches and tillers, The specific leaf area of ​​black shell species is higher than that of Changchun black shell species. The SLA of alfalfa leaves is also different depending on the cultivation method. The blades of aquatic cultivation are more green and green, SLA is smaller, and the leaves are thinner. However, the dark-green color of leaves cultivated on xerophyte leaves is thicker and the SLA is larger, especially in the middle and upper leaves. The SLAs of main stems and leaves of the black stem species and Changchun black shell species were 7.8% and 18.7% higher than that of the aquatic cultivation, respectively, and 12.5% ​​and 13.0% higher for the tillers and tillers.

Through the measurement of the leaf area meter, it can be concluded that the change of the area of ​​the middle loquat of the loquat season basically conforms to the univariate cubic equation, and the seedling period is relatively low. After the jointing stage, it increases rapidly, reaching the maximum at the end of the heading stage and decreasing at the later stage. The black-shelled black shell species is large in size and leaves, and the leaf area is much higher in the middle and later periods than Changchun black shell species under the same cultivation conditions. Rhizopus genus wet crops have higher yields under flooding conditions, but this experiment shows that pupa grows poorly under flooding conditions in the whole growth period, with thin leaves and low leaf area.

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