Leaf area meter is an important indicator of crop community changes
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At present, there is no unified conclusion about when corn enters the reproductive growth stage, which restricts the accurate simulation of corn growth and photosynthetic product distribution. The leaf area measurement instrument found that when the last leaf of a maize plant is fully grown, it is the fertilizing period of the female corn flower, which can be regarded as the turning point sign of the transition from vegetative growth to reproductive growth of the corn. The leaf area index (LAI) reflects the crop community. The important indicator of area change.
The leaf area measuring instrument research proposed that the maximum LAI is the sign that corn enters the reproductive growth stage, which avoids the error caused by using the specific growth period to judge the corn entering the reproductive growth stage. Combined with the index of maximum leaf area index of spring maize and the dynamic universal model of spring maize leaf area index, the dynamic date of maximum leaf area index and leaf area index of spring maize can be determined, which provides a basis for accurate simulation of leaf growth and photosynthetic product distribution of spring maize. .
Combined with the direct measurement values ​​of the leaf area meter, a dynamic universal model of the relative leaf area index of spring maize was constructed to avoid differences in the leaf area index due to different maize varieties, sowing dates, planting densities, and cultivation measures, and thus to be able to Accurately reflect the changes in the leaf area index of spring maize during the growth period.