Effects of Different Nitrogen Application Treatments on Root Growth of Green Manure Plants Seedlings in Xizang
To study the effect of nitrogen fertilizer on the root system of green fertilizer plants in Qinghai-Tibet Plateau,green manure plants(alfalfa and Vicia sativa)were used as experimental materials in pot experiments with different nitrogen application levels(0,0.06,0.12,0.18,0.24,0.30 g/dm2)in Xizang University of Agriculture and Animal Husbandry.The effects of different nitrogen application treatments on root characteristics of green manure plants were studied.The results showed as follows:the root length,projected area,area,surface area,volume and branch number of alfalfa showed a trend of first decreasing,then increasing and then decreasing under different nitrogen application levels,and the changes were the largest under N5 treatment(0.30 g/dm2),which were higher than those in the control group.The number of root tips of Vicia sativa decreased first,then increased and then decreased.Root length,root projection area,root area,root surface area,root volume and root branching number showed a trend of first gradually increasing,then decreasing and then increasing.Root growth of Vicia sativa was signifi-cantly affected when common vetch was more than 0.18 g/dm2(N3 treatment).In general,for alfalfa,the effect of low nitrogen level on root growth was not obvious,and high concentration of nitrogen was helpful to promote the growth of plant roots.Root growth of Vicia sativa was sig-nificantly affected by overapplication of nitrogen fertilizer.Therefore,the appropriate nitrogen concentration should be controlled in the growth management of green manure plants to achieve the best production benefits.The results provide a theoretical basis for the improvement of nitro-gen fertilizer application technology in Tibet,and also provide a scientific reference for the large-scale cultivation of alfalfa and Vicia sativa.
Nitrogen applicationAlfalfaVicia sativaRoot system growth
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