| Effects of regulated water and fertilizer on potato growth, quality, water and fertilizer use efficiency under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2020.01.21 |
| Key Words: potato drip irrigation water and fertilizer regulation yield tuber quality water and fertilizer use efficiency |
| Author Name | Affiliation | | BI Lifei | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | ZHANG Fucang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | WANG Haidong | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | WANG Ying | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | WU You | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | XIANG Youzhen | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China | | FAN Junliang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Areas of China,Northwest A&F University，Yangling, Shaanxi 712100, China |
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| Abstract: |
| To better understand the effects of regulating water and fertilizer on growth, quality, water and fertilizer use of potato under drip irrigation in Yulin areas in Northern Shaanxi and in order to explore the water and fertilizer regulation mode of high quality and high yield of potato with the potato species of Zihuabai, there were total of 12 treatments combining three lower limits of soil moisture regulation including W1 (55%, 60%, 65%, 55%, and 55%), W2 (65%, 70%，75%, 65%, and 65%), W3 (75%, 80%, 85%, 75%, and 75%) and four N-P2O5-K2O (kg·hm-2) fertilization rates of F1 (100-40-150 kg·hm-2), F2 (150-60-225 kg·hm-2), F3(200-80-300 kg·hm-2), F4 (250-100-375 kg·hm-2) at different growing stages (seedling stage, tuber formation stage, tuber swelling stage, starch accumulation stage, and maturity stage). Growth, yield and quality indices were measured during the growing season exploring the responses mechanism of each index of potato to irrigation and fertilizer. The results showed that: (1) At the same fertilizer rate, the growth, yield, quality, and water and fertilizer use efficiency of potato of W2 were significantly higher than that of W1 and W3. The yield of W2 was 43 187.15 kg·hm-2, 24.59% and 5.26% higher than W1 and W3, respectively. The starch content and vitamin C content of W2 was increased by 15.32% and 8.04%, 6.37% and 4.66%, respectively. Water use efficiency (WUE) of W2 increased by 15.53% and 7.54%. The partial fertilizer productivity (PFP) of W2 increased by 21.65% and 4.41%. (2)At the same irrigation level, the growth, yield, and WUE of potato with F3 were higher than those of F1, F2, and F4. The starch content and vitamin C content of F2 were the highest. The average yield of F3 was 44 691.32 kg·hm-2, which was 41.79%, 10.98%, and 6.34% higher than F1, F2, and F4, respectively. The WUE showed a parabolic trend with the increase of fertilization amount. The PFP gradually decreased with the increase in fertilizer application. The PFP of F1 was 108.69 kg·kg-1, which was 17.41%, 41.06%, and 87.50% higher than F2, F3, and F4, respectively. (3)The evaluation of potato quality by principal component analysis showed that F3W2 treatment ranked first. Comprehensively considering growth, quality, yield, and water and fertilizer use efficiency, F3W2 treatment was the best water and fertilizer combination for high quality and yield of potato in Yulin area. |
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