摘    要 本论文以蒙古黄芪幼苗为试材，选用Arnon-Hoagla

Abstract In <br> <br>this paper, Mongolian astragalus seedlings are used as test materials, Arnon-Hoagland nutrient solution is used to dilute three different concentrations of original concentration, one-half concentration, and one-third concentration to cultivate astragalus seedlings, and cultivate astragalus in garden soil seedling. Take a week as a cycle, take the roots and leaves of five groups of Astragalus seedlings, use spectrophotometer and standard curve to determine the soluble protein, reducing sugar, starch, chlorophyll content of Astragalus seedlings and the external form of Astragalus seedlings Compare. It is hoped that through this experiment, a nutrient solution capable of cultivating high-quality Astragalus seedlings will be selected. <br>The content and external morphological indexes of Astragalus seedlings cultivated by nutrient solution were higher than those of Astragalus seedlings cultivated in garden soil. Among them, the Astragalus seedlings cultivated with the original concentration of nutrient solution had the highest indexes. Nutrient solution nursery can shorten the nursery time and improve the seedling quality, which is conducive to early maturity and high yield, and at the same time can reduce the damage to the astragalus roots during picking. Through the experiment, it can be concluded that the original concentration of nutrient solution can cultivate high-quality Astragalus seedlings, which is conducive to alleviating the current shortage of Astragalus resources and insufficient supply, and the large difference in quality of artificial cultivation. <br> <br>Keywords: Astragalus seedlings; nutrient solution; seedling quality

Excerpts<br> <br>In this paper, The Mongolian jaundice seedlings were used as a test material, Arnon-Hoagland nutrient solution was selected to dilute the original concentration, one-half concentration, one-third concentration of these three different concentrations to cultivate jaundice seedlings, while cultivating jaundice seedlings in the garden soil. Taking the roots and leaves of five groups of jaundice seedlings for a one-week cycle, using a spectrophotometer and a standard curve to determine the soluble protein, reducing sugar, starch, chlorophyll content and the external morphology of jaundice seedlings, the data were compared. It is hoped that this test can be selected to cultivate high-quality jaundice seedlings of nutrients.<br>The content and external morphological index of jaundice seedlings cultivated by the nutrient solution were higher than that of the jaundice seedlings cultivated in the garden soil. Among them, the original concentration of nutrients produced by the yellow jaundice seedlings each indicator of the highest. Nutritional liquid seedling can shorten the seedling time, improve the quality of seedling, is conducive to precocious abundance, at the same time can reduce the damage to the jaundice root system when picking. Through the test, it is concluded that the original concentration of nutrient solution can cultivate high-quality jaundice seedlings, which is conducive to alleviating the current shortage of jaundice resources, the quality of artificial cultivation is large.<br> <br>Keywords: jaundice seedlings; nutritional fluid; seedling quality

To pick<br> <br>In this paper, Astragalus mongholicus seedlings were used as the test material, and Arnon Hoagland nutrient solution was used to dilute the original concentration, one-half concentration and one-third concentration to cultivate Astragalus mongholicus seedlings. At the same time, Astragalus mongholicus seedlings were cultivated in garden soil. The content of soluble protein, reducing sugar, starch, chlorophyll and the external morphology of Astragalus seedlings were measured with spectrophotometer and standard curve, and the measured data were compared. It is hoped that the nutrient solution which can cultivate high quality Astragalus seedlings can be selected through this experiment.<br>The content and external morphological indexes of Astragalus seedlings cultured in nutrient solution were higher than those cultured in garden soil. Among them, the original concentration of nutrient solution cultured Astragalus seedlings of the highest indicators. The nutrient solution can shorten the seedling time, improve the seedling quality, benefit the early maturity and high yield, and reduce the damage to the root system of Astragalus. The results show that the original concentration of nutrient solution can cultivate high-quality Astragalus seedlings, which is conducive to alleviate the shortage of Astragalus resources and the current situation of large differences in artificial cultivation quality.<br> <br>Key words: Astragalus seedling; nutrient solution; seedling quality