Nutrient solution concentration and growing season affect yield and quality of Lactuca sativa L. var. acephala in floating raft culture
Nutrient solution concentration and growing season affect yield and quality of Lactuca sativa L. var. acephala in floating raft culture
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DOI：
10.1002/jsfa.3641
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发表时间：
2009-08-15
影响因子：
4.1
通讯作者：
Colla, Giuseppe
中科院分区：
文献类型：
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作者：
Fallovo, Carlo;Rouphael, Youssef;Colla, Giuseppe
背景技术背景：消费者对嫩叶蔬菜的兴趣越来越大，主要用于混合沙拉，既作为新鲜市场产品，也作为即食蔬菜。施肥是控制和提高人类消费作物产量和营养质量的最实用和有效的方法之一。绿叶菜的最佳施肥浓度取决于环境条件。研究了不同营养液浓度（2、18、34、50和66 mequivL-1）对莴苣（Lactucasativa L.）产量和品质的影响。变种结果：随着营养液浓度的增加，无瓣无瓣芹的商品鲜产量、总干生物量、叶面积指数、大量元素（N、P、K、Mg）含量、硝酸盐含量和叶绿素含量均增加，而根冠比、葡萄糖、果糖、淀粉、总糖和蛋白质含量则相反。在春季生长的植物表现出较低的产量和生长（总干生物量和叶面积指数），但叶质量较高（较高的碳水化合物含量和较低的硝酸盐含量）。结论：使用浓度为37和44毫当量L的营养液-在现有条件下，春、夏两季分别采用1号施肥，可提高商品鲜产量和叶片矿质元素含量，但某些营养参数略有下降。(C)2009年化学工业协会
BACKGROUND: There is growing interest among consumers in baby leaf vegetables, mostly requested for mixed salads, both as fresh market products and ready-to-use vegetables. Fertilisation is one of the most practical and effective ways of controlling and improving the yield and nutritional quality of crops for human consumption. The optimal fertiliser concentration for baby leaf vegetables depends on the environmental conditions. The aim of the present work was to determine the effects of nutrient solution concentration (2,18, 34, 50 or 66 mequiv L-1) during two consecutive growing seasons (spring and summer) on the yield and leaf quality of Lactuca sativa L. var. acephala grown in a floating system.RESULTS: Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in nutrient solution concentration, while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents. Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season.CONCLUSION: The use of nutrient solution concentrations of 37 and 44 mequiv L-1 for the spring and summer seasons respectively could be adopted in the present conditions to improve marketable fresh yield and leaf mineral content, but with a slight reduction in some nutritional parameters. (C) 2009 Society of Chemical Industry