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| DOI：10.13522/j.cnki.ggps.2017.0020 |
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| Impact of N Application and Intra-competition of Tomato Seedlings on Their Root Morphology, Biomass Accumulation and N Use Efficiency |
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LI Shuang, GAO Yang, SI Zhuanyun, Tefo Steve Ramatshaba, DUAN Aiwang
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/ Key Laboratory of Crop Water Requirement and Regulation, Ministry of Agriculture, Xinxiang 453002, China
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| Abstract: |
| 【Objective】 Competition of plants for resources could impact their development and resources acquisition. In this paper, we investigated the impact of nitrogen application and intra-competition of tomato seedlings on their root morphology, photosynthetic traits, above-ground biomass accumulation and nitrogen use efficiency. 【Method】 Pot experiments were conducted in a walk-in greenhouses with sufficient water supply. Two nitrogen treatments were examined: sufficient nitrogen application (N15) with nitrogen concentration in the nutrition solution at 15 mmol/L, and insufficient nitrogen application (N1) with nitrogen concentration in the nutrition solution at 1 mmol/L. The intra-competition was created by growing four plants in one pot (P4); the control was growing a single plant in one pot (P1). 【Result】①With the seedlings growing, Pn, Gs and root morphology in N15-P1 treatment were superior to those in other treatments, and at the same nitrogen application, intra-competition reduced Pn. ②Leaf area per plant increased with nitrogen application, while at the same nitrogen application, intra-competition reduced the leaf area per plant, giving rise to a decrease in above-ground biomass accumulation. ③Increasing nitrogen application led to a rise in soil nitrate and total nitrogen in leaves; intra-competition increased nitrogen in leaves compared with those without competition. 【Conclusion】 When the nitrogen concentration in the nutrient solution was at 1 mmol/L, the seedling without competition grew well, whereas when the nitrogen concentration was at 15 mmol/L, the seedlings competing for resources took up more nitrogen due to the relief in nitrogen stress. |
| Key words: intra-competition; root morphology; photosynthetic characteristics; biomass accumulation; nitrogen utilization |
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