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| DOI：10.13522/j.cnki.ggps.2017.0674 |
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| Effects of the Ratio of Nitrogen and Phosphorus Concentrations in Drip Fertigation on Yield and Yield Components of Chinese Wolfberry |
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KANG Chao, YANG Liu, WANG Hao, NAN Xiongxiong, WANG Rong, SUN Quan
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1.College of Agronomy, Ningxia University, Yinchuan 750021, China; 2. Research Center of Chinese Wolfberry Engineering Technology, State Forestry Administration, Yinchuan 750004, China; 3. Ningxia Wuzhong National Agricultural Science and Technology Park Management Committee, Wuzhong 751100, China
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| Abstract: |
| 【Objective】 Rationally coupling different fertilizers in fertigation can improve nutrient use efficacy and food quality. This paper aimed to experimentally study the optimal ratio of nitrogen and phosphorus when they were used together with irrigation to fertilize Chinese wolfberry. 【Method】 The experiments were conducted in field with the Chinese wolfberry “Ningqi 9” as the model plant. A two-factor and three-level randomized block design was designed based on a uniform potassium concentration of 40 mg/L. We considered three nitrogen concentrations: 40 mg/L (N1), 60 mg/L (N2) and 80 mg/L (N3), and three phosphorus concentrations: 10 mg/L (P1), 20 mg/L (P2) and 30 mg/L (P3). In all treatments, we measured the yield , the yield components, as well as the return of the investment in fertilizers. 【Method】 The effects of nitrogen concentration on the number and fresh weight of the wolfberry were not noticeable, as opposed to the P concentration. All treatments with P3 significantly increased the number and fresh weight of the wolfberry. Different N∶P ratios had significant effect on the yield of the wolfberry and economic return of the fertilizers. The best N∶P ratio was N1-P1, with a yield of 14 220 kg/hm2 and input : output ratio of 38.33. N2-P3 gave the highest yield, reaching 16 095 kg/hm2, with a moderate input-output ratio but highest economic return. 【Conclusion】 When the potassium concentration was 40 mg/L, the suitable nutrient solution used in fertigation was N2-P3 for the wolfberry, reducing fertilizer costs and increasing investment return. |
| Key words: nitrogen and phosphorus coupling; leaf utilization wolfberry; yield; components |
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