Method for determining leaf area index of spring wheat: The leaf area index of spring wheat was obtained by leaf area meter. In order to ensure the high precision of the observation data, each time the leaf area index is observed by the leaf area measuring instrument, 15 sample points are randomly taken and corrected by manual sampling method.
The specific correction method is as follows: firstly, count the number of spring wheat in the sampling range (60cm×60cm), and then select 10 representative spring wheats in the sample area to observe the number of leaves per plant, and then select 20 representative leaves. The area of ​​the single blade was measured using a leaf area meter. All the sample leaves were placed flat on a white paper of a known area, and a photograph was taken at a height of about 1.5 m from the blade. The ratio of the leaf area to the paper area was determined by the same method as the coverage. Area.
In order to ensure high-precision observation of the leaf area index of spring wheat, the leaf area index obtained by the leaf area instrument was corrected by manual sampling method. The leaf area index is obtained by the leaf area instrument. The real leaf area index is calculated according to the manual sampling method. The linear regression relationship between the effective value and the real value is analyzed. The results show that the two have a very significant linear relationship. The correlation coefficient is as high as 0.87. Therefore, it is feasible to use the manual sampling method to correct the leaf area index observed by the leaf area measuring instrument.
During the whole observation period of the leaf area meter, the spring wheat coverage and the leaf area index have the same trend with time, and both reach the maximum peak first and then decrease. It is not difficult to find that the spring wheat coverage and leaf area index reached the maximum around June 22, and June 22 was also the maximum observation date of the spring wheat plant height in the study area.
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