Nitrogen Uptake Efficiency and Total Soil Nitrogen Accumulation in Long-Term Beef Manure and Inorganic Fertilizer Application

Table 1

Treatment structure, composition, and description for Magruder Plots located at Stillwater in Oklahoma, USA.

Treatment	Composition	Description	Input sources	Form and quantity applied
1	Manure	Cattle manure applied every 4 years	Cattle manure	Cattle manure 269 kg N·ha^−1
2	—	Check, no nutrient applied	—	—
3	P	P applied each year	TSP	P2O5 (0-34-0)
4	NP	N and P applied each year	Urea, TSP	N, P2O5 (67-34-0)
5	NPK	N, P, and K applied each year	Urea, TSP, KCl	N, P2O5, K2O (67-34-34)
6	NPKL	N, P, and K applied each year + lime applied when soil pH < 5.5	Urea, TSP, KCl + Aglime	N, P2O5, K2O + lime (67-34-34)