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Effects of nitrogen supply level on nutrient absorption, distribution and yield of cucumber grown in substrate bag culture system |
JIANG Jingjing, CHANG Xiaoxiao, HU Xiaohui* |
(College of Horticulture, Northwest A & F University/Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture, Yangling 712100, Shaanxi, China)
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Abstract The experiment was conducted to study the effects of different nitrogen supply levels on nutrient uptake, distribution and yield of cucumber grown in substrate bag culture system. The different supply nitrogen treatments were as follows: the control (CK, 0 kg N per plant), low nitrogen (N1, 0.016 kg N per plant), medium nitrogen (N2, 0.023 kg N per plant) and high nitrogen (N3, 0.030 kg N per plant). Results showed that the accumulation of nitrogen, phosphorus and potassium in cucumber increased at first and then decreased with the increase of nitrogen supply, indicating that reasonable nitrogen level was beneficial for cucumber to improve the absorption of nitrogen, phosphorus and potassium, especially significantly enhanced the absorption of nitrogen, phosphorus and potassium in fruiting period of cucumber. In the whole growth period, cucumbers had the highest absorption rate of potassium, followed by nitrogen, and then phosphorus. The yield was the highest with the medium nitrogen treatment. The utilization rates of nitrogen in cucumber were between 21.3% and 27.8% with different treatments, which increased in early stage and then decreased later with the increase of nitrogen. Using the path analysis of leaf area, stem diameter, dry matter quality and yield of cucumber, the results illustrated that yield could be used as the first index of nitrogen uptake. In the whole, the medium nitrogen treatment (0.023 kg N per plant) is relatively appropriate nitrogen supply level for cucumber substrate bag culture.
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Published: 25 November 2018
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供氮水平对基质袋培黄瓜养分吸收分配和产量的影响
采用基质袋培种植方式,设置对照(CK,施氮量0 kg/株)、低氮(N1,施氮量0.016 kg/株)、中氮(N2,0.023 kg/株)和高氮(N3,0.030 kg/株)4 种供氮水平,研究氮素供应水平对黄瓜植株养分吸收、分配和产量的影响。结果表明:随着供氮量的增加,黄瓜对氮、磷、钾元素的累积量均呈先升后降的变化趋势,表明合理增施氮肥有利于提高黄瓜对氮、磷、钾元素的吸收,特别是能显著提高结果盛期黄瓜对氮、磷、钾元素的累积。在整个生育期,黄瓜对钾的吸收量最高,氮次之,磷最少,其中以中氮处理的产量最高。各处理黄瓜氮肥利用率为21.3%~27.8%,且随施氮量的增加呈开口向下的抛物线变化趋势。选用叶面积、茎粗、干物质量和产量等指标对吸氮量进行通径分析,结果表明,产量可作为衡量黄瓜吸氮量的第一指标。综上所述,在磷、钾肥供应量不变的基础上,中氮处理(施氮量0.023 kg/株)为黄瓜基质袋培相对较适宜的供氮水平。
关键词:
基质袋培,
供氮水平,
黄瓜,
养分吸收,
产量,
通径分析
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