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| DOI：10.13522/j.cnki.ggps.2017.0358 |
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| Effects of Different Fertilizers Application on Soil Nitrate, Growth and Yield of Tomato Growing in Solar Greenhouse in Northern Shaanxi Province |
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XING Jinjin, XING Yingying, WANG Xiukang, WANG Yanfeng， LI Xiuxiu， NIE Jiabin
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College of Life Sciences, Yan’an University, Yan’an 716000, China
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| Abstract: |
| 【Objective】 The aim of this work is to experimentally study the optimal fertilizers application for vegetables growing in solar greenhouse in Northern Shaanxi Province. 【Method】 The model plant was tomato (Solanum lycoper sicum Mill., or Jufeng) and the soil moisture was kept sufficient via irrigation. Seven N∶P∶P ratios were examined: 0∶0∶0 (CK), 120∶48∶168 (N1), 240∶96∶336 (N2), 360∶144∶504 (N3), 480∶192∶672 (N4), 600∶240∶840 (N5), and 720∶288∶1 008 kg/hm2 (N6). In the experiments, we measured the plant height (H), stem diameter (D), yield and soil nitrate concentration. 【Result】 The plant height and plant elongation rate at low fertilization, N1 and N2, and high fertilization, N5 and N6, were lower than those at other two treatments, and they peaked at N3. The stem diameter in N1, N2, N3, N4, N5 and N6 increased by 15%, 32%, 6%, 4%, 9.0% and 3%, respectively, compared to the CK; both D and D∶H ratio increased with fertilization. At low and high fertilization, soil nitrate accumulated in 50~70 cm, while at N3 and N4 the nitrate was manly in 30~40 cm, more accessible for roots to take up. The yield increased with fertilization first and then peaked at N3, followed by a decline with a further increase in fertilizers application. 【Conclusion】 Moderate fertilization promotes plant growth and yield with the nitrate accumulated in the root zones, facilitating root uptake and reducing nitrogen leaching. Therefore, under sufficient irrigation, the optimal fertilization for tomato in solar greenhouse in Northern Shanxi Province is to keep the N∶P∶K ratio in the range of 360∶144∶504 to 480∶192∶672 kg/hm2. |
| Key words: Northern Shaanxi; tomato; growth; nitrate content; greenhouse |
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