publication . Article . 2017

Effect of Ni and Urea on Growth, Nitrate and Nutrients Concentration in Lettuce (Lactuca sativa) Grown in Hydroponics

Hosein Nazari Mamaqani; Seyed Jalal Tabatabaei;
Open Access Persian
  • Published: 01 Feb 2017 Journal: Majallah-i ̒Ulum-i Bāghbānī (issn: 2008-4730, eissn: 2423-3986, Copyright policy)
  • Publisher: Ferdowsi University of Mashhad
Abstract
Introduction: The N source used in commercial hydroponic culture of vegetables is mainly NO3-N. The rate of NO3- uptake is usually high, particularly in leafy vegetables and it can be markedly increased when the NO3- supply in the environment is high. An abundant N supply leads to a high NO3-N absorption and accumulation in plants. When NO3- rich vegetables are consumed, various harmful effects on human health may occur such as met-hemoglobinemia (Blue Baby Syndrome) and cancer. Keeping levels of NO3- below limits of FAO seems to be impossible without changing conventional fertilizer application techniques. The suitability of urea for the cultivation of field cr...
Subjects
Medical Subject Headings: food and beverages
free text keywords: Hydroponics, Leafy vegetables, Nitrate accumulation, Nitrogen, Potassium, Agriculture (General), S1-972
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