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The wheat growth process in the main wheat producing areas in Heilongjiang Province can be divided into the early, middle and late stages, ie, before jointing, jointing to flowering, and flowering to maturity. The fertility of these four varieties shows different performances. The leaf area instrument samples were tested in the Keshan Wheat Research Area, with 6 lines for each species, 2.5 cm on demand, 3m line length, 15cm spacing, and 3 replicates. After the three-leaf stage, the leaf area of ​​the main stem, the total leaf area of ​​the main stem, the total area of ​​the tiller, and the total leaf area of ​​the whole plant were measured by the leaf area meter at each growth stage. Each time, five plants were sampled for each replicate. .
The change of flag leaf area of ​​the main stem was determined by the leaf area meter. There was a big difference among the varieties. The change of the tiller leaf area of ​​all the four varieties showed a single peak curve, and the leaf area was generally about the heading date. Maximum value. Among them, the peak value of the tiller leaf area was the highest, which was nearly 300cm2, indicating that this ecological type had strong ability to deliver and a higher leaf area index.
Some leafy leaf areas decay faster and decay earlier, while others show slower and later decay. The value of leaf area meter can be used to show that the functional modes of the leaf area of ​​tillers of the four genotypes are different, and their contribution to the yield is also different. The leaf area traits of all levels are in high value areas, especially the total volume occupies an advantage. However, although the leaf area is small, but the duration is longer, while some are in the middle state, but the characteristics of tillering are more prominent.
Through the leaf area meter for the determination of different varieties of wheat in Heilongjiang Province, the leaf area performance, total leaf area, the number of main functional leaves and the duration of the functional period of the drought-resistant and dry-fertilizer cultivars all have advantages, and the performance has a strong source. The characteristics, such as hi-gain and moisture-tolerance, are secondary. This is related to the biological characteristics of the various genotypes and the experimental sites that are located in the semi-arid environment. It is an indication of ecological adaptability.