| Effect of water and fertilizer supply on potato root layer soil nutrient and tuber yield |
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| DOI：10.7606/j.issn.1000-7601.2020.04.18 |
| Key Words: irrigation amount fertilization amount potato nitrate nitrogen ammonium nitrogen alkaline nitrogen yield |
| Author Name | Affiliation | | GUO Tao | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | LIU Wanru | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | FANG Yuchuan | Yulin Agricultural Science Research Institute, Yulin, Shaanxi 719000, China | | LI Meitian | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | XIE Kui | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | WANG Fei | Yan’an Agricultural Science Research Institute, Yan’an, Shaanxi 716000, China | | LI Xia | Yan’an Agricultural Science Research Institute, Yan’an, Shaanxi 716000, China | | DU Juan | Yan’an Agricultural Science Research Institute, Yan’an, Shaanxi 716000, China | | JIANG Wenting | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | XING Yingying | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China | | WANG Xiukang | College of Life Sciences, Yan’an University, Yan’an, Shaanxi, 716000, China |
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| Abstract: |
| Holland No.15 which is widely planted in Northern Shaanxi Province as the test material,set the two factors of irrigation level and fertilizer rate, based on full irrigation (W1, 100%ET0) and local recommended fertilizer rate (F1, N-P2O5-K2O is 240-120-300 kg·hm-2), and the three irrigation amounts are respectively W1, W2 (80%ET0) and W3 (60%ET0), the three fertilization levels are F1, F2 (75%F1) and F3 (50%F1) respectively, with 60% ET0 irrigation level and no fertilization treatment as control group (CK), a total of 10 treatments. The results showed different water and fertilizer supply had a significant effect on water consumption and water use efficiency at each growth stage of potato. With the increase of irrigation water, soil water gradually moved to the lower layer.In the whole growth period of potato, W3F2 treatment has the highest water use efficiency, 44.69 kg·hm-2·mm-1, followed by W2F2 (44.41 kg·hm-2·mm-1), which is 39.64% and 38.75% higher than CK, respectively; W3F1 treatment has the highest average nitrate nitrogen content in 10～60 cm soil layer, 166.1% higher than CK, W2F2 has the highest average ammonium nitrogen content in 10～60 cm soil layer, 61% higher than CK, W3F3 has the highest average conductivity in 10～60 cm soil layer, 48.44% higher than CK. The soil nutrient content of W2F2 treatment was higher, mainly concentrated in the 10～30 cm soil layer; the highest yield of W2F2 treatment was 12 539.33 kg·hm-2, which was 55.65% higher than that of CK treatment, and the coefficient of variation was small. Therefore, the recommended irrigation amount in this region is W2(80%ET0), and the amount of fertilizer of N-P2O5-K2O is 180-90-225 kg·hm-2. |
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