Quantitative Nutrient Management Reduces Nitrate Accumulation in Hydroponic Butterhead Lettuces Grown under Artificial Lighting
Quantitative Nutrient Management Reduces Nitrate Accumulation in Hydroponic Butterhead Lettuces Grown under Artificial Lighting
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DOI：
10.21273/hortsci12418-17
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发表时间：
2018-07
期刊：
影响因子：
1.9
通讯作者：
Y. Sago;Airi Shigemura
中科院分区：
文献类型：
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作者：
Y. Sago;Airi Shigemura
为了降低人工光照下蔬菜中硝酸盐的浓度，我们测定了不同硝酸盐效价条件下的硝酸盐积累量。在不同浓度的营养液中生长，并根据整个栽培期间的电导率（EC）保持营养液的浓度。在这些条件下，在低EC的营养液中生长会导致叶片中硝酸盐浓度的轻微下降，但也会降低芽部的鲜重和干重，导致EC控制管理（ECM）下产量损失的风险。相比之下，当栽培开始时仅提供总硝酸盐需求时，叶片中硝酸盐浓度显著降低，植株生长仅略有下降。因此，可以通过在栽培开始时向营养液中提供总硝酸盐需求来生产硝酸盐浓度较低的可销售大小的butterhead生菜。
To reduce nitrate concentrations in vegetables grown under artificial lighting, we determined nitrate accumulation under various conditions of nitrate availability. Butterhead lettuce plants were grown with nutrient solutions of various concentrations, which were maintained according to electrical conductivity (EC) throughout the cultivation period. Under these conditions, growth in nutrient solutions with lower EC led to slight decreases in nitrate concentrations in leaves, but also decreased fresh and dry weights of shoots, leading to the risk of a yield loss under EC control management (ECM). By contrast, when total nitrate requirement was supplied only at the start of cultivation, nitrate concentrations in leaves were decreased significantly with only slightly reduced plant growth. Hence, marketable-sized butterhead lettuces with lower nitrate concentrations can be produced by supplying total nitrate requirements in the nutrient solution at the start of cultivation.