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Yield and crop growth of table potato affected by different split-N fertigation regimes in sandy soil

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To explore the response of yield, crop growth as well as water and N use efficiency to different fertigation regimes, three years field experiment were carried out. The factors in the experiment comprised five N levels providing 0, 60, 100, 140 and 180 kg N ha(-1), and one real time model (Daisy model)-based N fertilization method, as well as three irrigation levels. Results showed that prolonged N fertigation increased yield consistently but N fertigation should be carried out early so that shoot growth is optimized and prolonged N have sufficient time to take effect on tuber yield accumulation. In all three years, the highest fresh yield and marketable yield was obtained when 180 kg N ha was applied. Compared to the 180 kg N ha(-1) treatment, realtime model-based N fertilization resulted in comparable yield (not different) in all seasons. Nevertheless, model based N fertilization resulted in yield that was significantly lower than the predicted maximum yield across the seasons, implying the necessity to adjust the parameters related to critical N concentration of Daisy model. The economic optimal were 142, 194 and 195 kg N ha(-1) in 2013, 2014 and 2015, respectively. Deficit irrigation did not cause reduced soil water content, ratio vegetation index (RVI) and yield, but irrigation efficiency was increased significantly in 2013.

TidsskriftEuropean Journal of Agronomy
Sider (fra-til)41-50
Antal sider10
StatusUdgivet - 1 jan. 2018

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