Evaluation and Screening of Nitrogen Efficiency of Solanum tuberosum L.in Cold and Arid Regions of North China
In order to screen Solanum tuberosum L.varieties with high nitrogen efficiency and improve nitrogen use efficiency in northwest Hebei,15 Solanum tuberosum L.varieties were selected as test materials,and two treatments were set up under field conditions:no nitrogen application and nitrogen application.Nitrogen efficiency was evaluated from Solanum tuberosum L.tuber yield,nitrogen con-centration,nitrogen absorption,nitrogen biological efficiency,nitrogen agronomic efficiency,nitro-gen partial productivity and nitrogen apparent use efficiency.The membership function was used to evaluate and screen the comprehensive nitrogen efficiency of Solanum tuberosum L.varieties.The results showed that the Solanum tuberosum L.yield was affected by both variety and nitrogen applica-tion level,and the yield was the highest in Daxiyang varieties without nitrogen application,with dry weight of 10 645.70 kg/667 m2.Under the nitrogen treatment,the yield of Solanum tuberosum L.Li increased the most with 23.38％.The 15 Solanum tuberosum L.varieties showed wide variation in nitrogen efficiency traits,such as nitrogen yield,nitrogen absorption,nitrogen agronomic efficiency,nitrogen partial productivity and nitrogen apparent use efficiency,with coefficient of variation ranging from 7％to 64％.There was no significant correlation between nitrogen concentration and yield,and there was a significant positive correlation between nitrogen apparent utilization and nitrogen agro-nomic efficiency.Membership function analysis showed that the comprehensive nitrogen efficiency of the Solanum tuberosum L.varieties Daxiyang,Jizhangshu8,North002 and Li was higher,and could be used for production or nitrogen efficient germplasm resources.
Solanum tuberosum L.varietynitrogen efficiency evaluationsubordinate function
NETL
NSTL
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