id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
afs-63668	Piikki, Kristin; Stenberg, Bo	A modified delta yield approach for estimation of economic optimal nitrogen rate (EONR) for wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.)	2017	10	.pdf	application/pdf	5784	285	60	For reference, the range of reported errors in earlier studies was added to the plot; e.g. Øvergaard et al. (2013) reported a root mean squared error of prediction (RMSEP) of 1560 kg ha-1 for wheat yield predictions based on hyperspectral measurements in field trials in Norway, while Engström and Piikki (2016) reported an MAE of 1100–1600 kg ha-1 for predictions based on a handheld hyperspectral sensor in Sweden. Moreover, ∆Y experiments can potentially be used for in-season EONR estimation, in which case the accuracy of the EONR predictions depends also on the uncertainty in yield predictions made at the time of supplementary fertilisation.	cache/afs-63668.pdf	txt/afs-63668.txt