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作 者 ：李灵芝, 郭荣, 李海平, 曹阳

期 刊 ：植物营养与肥料学报 2010年 16卷 4期 页码：965-969

关键词：番茄；氮；生长发育；光谱特性；

Keywords:tomato, nitrogen, growth and development, spectral characteristic,

摘 要 ：营养液培养法研究不同氮浓度对温室番茄的生长发育及叶片光谱特性的影响。结果表明，在0～15 mmol/L范围内，随着营养液中氮浓度的增加，番茄的叶面积指数、株高、叶片数、花穗数、产量和叶片的吸光度都增大，但是超过一定的范围，植株的生长和发育均会受到抑制，说明适宜的氮素促进了植株的生长和发育。其中，处理N15的叶面积指数达到了3.0,叶片数和花穗数分别是26.7和7.0，均高于其它处理。不同处理间番茄产量均存在极显著的关系，以N15处理最高，N5的最低。从叶片的光谱图中可提取出与叶绿素有关的特征波段。在本试验条件下，番茄水培时营养液适宜的氮浓度为15 mmol/L。

Abstract:The effects of different nitrogen concentrations of nutrient solution on growth and development of tomato and spectral characteristics of leaves were studied in hydroponics in asymmetrical multi-span greenhouse. The results show that leaf area index(LAI), plant height, number of leaves, number of trusses and yield of tomato and absorbance of leaves are improved with the increase of nitrogen concentration of nutrient solution within a certain limit of 0—15mmol/L, which indicates that nitrogen fertilization can promote growth and development of tomato plant. But growth and development of tomato plant is decreased when nitrogen concentration of nutrient solution is high. The highest LAI in the treatment of N15 is about 3.0, while those in the other treatments are lower in the whole growth period. Numbers of leaves and trusses in the treatment of N15 are the biggest among the four treatments, 26.7 and 7.0, respectively. There is significant correlation between tomato yield and nitrogen concentration in the six treatments. The yield is the highest under the treatment of N15 and is the lowest under the treatment of N5. Some spectral wave lengths which related to chlorophyll are extracted from spectral characteristics of leaves. The optimal nitrogen concentration of nutrient solution for tomato in the experiment is 15 mmol/L in hydroponics.

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