TY - JOUR
T1 - Yield and crop growth of table potato affected by different split-N fertigation regimes in sandy soil
AU - Zhenjiang, Zhou
AU - Plauborg, Finn
AU - Liu, Fulai
AU - Kristensen, Kristian
AU - Andersen, Mathias Neumann
PY - 2018/1
Y1 - 2018/1
N2 - 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−1 was applied. Compared to the 180 kg N ha−1 treatment, real-time 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.
AB - 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−1 was applied. Compared to the 180 kg N ha−1 treatment, real-time 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.
U2 - 10.1016/j.eja.2017.10.001
DO - 10.1016/j.eja.2017.10.001
M3 - Journal article
SN - 1161-0301
VL - 92
SP - 41
EP - 50
JO - European Journal of Agronomy
JF - European Journal of Agronomy
ER -