Effect of N uptake concentration on nitrate leaching from tomato grown in free-draining soilless culture under Mediterranean conditions

Abstract:

Free-draining soilless culture is commonly used in greenhouses in the Mediterranean Basin, frequently with tomato. Crop N uptake concentration has been proposed as a tool to assist with N management of crops in soilless culture. Three tomato crops were grown in free-draining rockwool to evaluate the relationship of crop N uptake concentration to crop N uptake and NO3− leaching. The three crops were 2005 spring, 2005 autumn–winter, and 2006 spring crops. Drainage fractions were 24% in each crop. Irrigation and drainage volumes were determined daily. N applied and leached were determined daily in the 2005 spring crop and otherwise weekly. Crop N uptake was determined by difference. Average N concentrations (NO3−–N plus NH4+–N) in nutrient solution were 9.6, 11.5 and 9.2mmolL−1, and in drainage (N leached) were 14.8, 8.5 and 11.8mmolL−1. The amounts of N leached were 178, 69 and …

Año de publicación:

2013

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