| Evaluation of nitrogen efficiency on potatoes with different genotypes in cold and arid regions of Northern China |
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| DOI：10.7606/j.issn.1000-7601.2020.06.03 |
| Key Words: potato variety nitrogen efficiency evaluation subordinate function method cold and arid regions of Northern China |
| Author Name | Affiliation | | REN Dongxue | Agronomy College, Hebei Agricultural University, Baoding, Hebei 071000, China | | ZHANG Lifeng | Agronomy College, Hebei Agricultural University, Baoding, Hebei 071000, China
Zhangbei Agricultural Resources and Ecological Environment Key Field Research Station, Ministry of Agriculture of China, Zhangjiakou, Hebei 076450, China | | LIU Yuhua | Agronomy College, Hebei Agricultural University, Baoding, Hebei 071000, China
Zhangbei Agricultural Resources and Ecological Environment Key Field Research Station, Ministry of Agriculture of China, Zhangjiakou, Hebei 076450, China | | Tian Zaimin | College of Agriculture and Forestry, HeBei North University, Zhangjiakou, Hebei 075000, China | | GONG Xuechen | College of Agriculture and Forestry, HeBei North University, Zhangjiakou, Hebei 075000, China |
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| Abstract: |
| In order to screen nitrogen (N) efficient varieties for production or breeding new variety as germplasm resource that is an important and cost\|effective way to improve the effectiveness of fertilizer inputs in potato fields,adopting the split\|plot designs using 15 conventional varieties as test materials cultivated around Bashang and circumambient cold and arid regions, with two N levels were conducted to evaluate the N efficiency of different varieties in terms of yield, N absorption, biological efficiency of N, agronomic efficiency of fertilizer N, partial productivity efficiency, and apparent utilization rate.On the basis of this, the subordinate function method was used to evaluate and classify the comprehensive N efficiency of each variety. The results showed that variety, N level and variety × N level had very significant effect on potato yield. Under the condition of no N, the highest yield of variety was Beifang 002 with a yield of 5 863 kg·hm-2 and the highest N biological efficiency of variety was Jinzhangshu 12 at 92.10 kg·kg-1. Under the condition of N, the highest yield of variety was Heshiwu with a yield of 8 284 kg·hm-2, the highest N biological efficiency of variety was V7 at 59.05 kg·kg-1. The N efficiency of variety varied widely in terms of ground force yield, yield after N, N absorption, biological efficiency of N, agronomic efficiency of fertilizer N, partial productivity efficiency, and apparent utilization rate, CV was between 21%~58%. The yield (Y) of different potato varieties was negatively correlated with the N content (X) of tubers under the condition of no N application, Y=-0.0019X+22.045 (R2=0.6269**); the yield (Y) was not significantly correlated with the N content of tubers under the condition of N, while the apparent utilization of tuber N was positively correlated with the P artial productivity efficiency (X), Y=1.617X-21.784 (R2=0.7465**). The subordinate function analysis showed that Heshiwu, Xisen 6, and Sifante（F8） had high comprehensive N efficiency and could be used in production as N efficient varieties or as N efficient germplasm material. |
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