A pot culture experiment is conducted to investigate the effects of soil changing on the biomass,root characteristics and nitrogen metabolism of Malus hupehensis seedlings.The results show that when the seedlings are changed from clay to loam,the root biomass increases,outer root substantially induced and NR and GS activities of outer fine roots enhanced,the lateral root developing to the horizontal;however,the number of lateral roots and total surface area of root decreases.When the growing soil is changed...
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