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Drainage and water recycling management to decrease nutrient losses and increase nutrient, water use efficiency and crop performance

Tan, C. S. and Zhang, T. Q. 2016. Drainage and water recycling management to decrease nutrient losses and increase nutrient, water use efficiency and crop performance. Oral presentation at ASABE International Annual Meeting, Orlando, Florida, USA, July 17-20, 2016.

Abstract

There is a strong public demand for a safe and secure water supply. A cost effective drainage water management & water recycling study was conducted in southern Ontario to improve water and nutrient management while protecting the environment and ensuring food safety and quality. The objectives of these studies are to determine the effectiveness of the innovative water management systems for reducing nitrogen, phosphorus losses and improving field and horticultural crops performance. The controlled drainage/subirrigation (CDS)-reservoir water recycling system under field crop production reduced total P and N losses by 12% and 21% relative to the regular free drainage (RFD) system, respectively. The drip irrigation water recycling system under processing tomatoes increase water and nutrient use efficiency relative to non-irrigated system. The CDS-reservoir system consistently increased corn and soybean yields relative to RFD system. In the droughty years, corn yield was increased by 91% and soybean yield was increased by 49%. In the relative wet years CDS-reservoir increased corn yield by average 15% and soybean yield by 19%. The commercial large scale drip irrigation water recycling system increased processing tomatoes yields by average 36% relative to non-irrigated system. This system also increased water and nutrient use efficiency by 25% and 35%, respectively, relative to non-irrigated system.

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