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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.
Original language | English |
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Journal | European Journal of Agronomy |
Volume | 92 |
Issue | Januar |
Pages (from-to) | 41-50 |
Number of pages | 10 |
ISSN | 1161-0301 |
DOIs | |
Publication status | Published - 1 Jan 2018 |
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