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After the potassium dihydrogen phosphate fertilizer was sprayed on the chlorophyll detector, the average chlorophyll content in the initial flowering, full flowering, final flowering and mature stages of the potato was determined. With the growth and development of potato plants, the total chlorophyll content in the leaves gradually increased, reached the final flowering stage, and then began to decline. The variation coefficient of the total chlorophyll content of potato during the whole flowering and final flowering stages was relatively large, indicating that the total chlorophyll content of potato leaves varied significantly between the different flowering and final flowering stages.
The results of chlorophyll detection showed that the effects of different combinations of potassium dihydrogen phosphate foliar spraying on the chlorophyll content of potato leaves were different in a relatively short time, showing the rapidity of the crop absorbing leaf fertilizer. In the low concentration of potassium dihydrogen phosphate spraying, the chlorophyll content increased with the increase of spraying concentration. When the spraying concentration was 0.250%, the chlorophyll content was the highest, and then the concentration of chlorophyll continued to increase with the spraying concentration. The chlorophyll content decreased. With the onset of spraying time, the chlorophyll content has a decreasing trend.
The high-quality potato is suitable for Qinghai, where the altitude is relatively high, the climate is cooler, the sunshine is sufficient, and the temperature difference between day and night is large. This is precisely because Qinghai Province is one of the main producing areas of potato products in China. The tuber yield of potato is closely related to the main index reflecting the photosynthesis of crops—the chlorophyll content of the leaves. Especially during the formation and expansion of potato tubers, the chlorophyll content of the leaves directly affects the formation of tuber quality and yield. Therefore, the determination of chlorophyll content in potato leaves generally needs to be measured using a chlorophyll detector. Differences in chlorophyll content in potato leaves not only between varieties, but also by cultivation techniques and field management measures. In order to establish the relationship between the chlorophyll content of potato in high-cold area of ​​Qinghai Province and the optimum spraying concentration of potassium dihydrogen phosphate and the start time of spraying, the effect of increasing the yield of potato was explored, and the feasible technical system for efficient fertilization of foliar was optimized. Item test.