| Effects of different water and nitrogen levels on tuber yield, water and nitrogen use efficiency of potato |
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| DOI：10.7606/j.issn.1000-7601.2016.06.29 |
| Key Words: potato soil water content nitrogen fertilizer rate yield water use efficiency nitrogen use efficiency |
| Author Name | Affiliation | | LI Wen-ting | Stata Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China | | WANG Shi-wen | Stata Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | DENG Xi-ping | Stata Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Hong-bing | Stata Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Using virus-free plantlets of potato (cultivar Atlantic), a pot experiment with three soil water levels (90%, 70% and 50% of field capacity) and three nitrogen fertilizer levels (0, 0.2, 0.4 g·kg-1) was conducted to study the effect of different water and nitrogen levels on tuber yield, water and nitrogen use efficiency of potato in order to provide information for better management of water and nitrogen in potato production. The results showed that, under the same water level, potato tuber yield, biomass, water and nitrogen use efficiency under moderate nitrogen were higher than those of low and high nitrogen. Under the same nitrogen level, potato tuber yield, biomass and nitrogen use efficiency all increased with the increase of soil water content. Among the nine treatments, tuber yield, biomass, nitrogen agronomic efficiency and partial factor productivity under well-watered and moderate nitrogen condition were the highest, and their values were 273 g·plant-1、359 g·plant-1、52.5 g·g-1 and 143.9 g·g-1, respectively. It suggests that 90% of field capacity and 0.2 g·kg-1 soil was helpful to higher yield and use efficiency of water and nitrogen. In addition, higher biomass and lower harvest index under moderate nitrogen suggest that moderate nitrogen increase yield mainly through increasing the accumulation of assimilates in plant, but not increasing the allocation of assimilates to tuber. |
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