The site was cropped to wheat fallow with conventional tillage.
The experiment area is under strict no-till management, with no tillage other than for seeding and stubble flailing. Herbicides are used to control weeds in both fallow and crop.
Soils are coarse silty mixed mesic Typic Haploxerolls
The climate is semi-arid, but partially influenced by maritime winds from the Pacific Ocean. Winters are cool and wet, and summers are hot and dry.
10 (-1 – 21)
Design period: (1982—)
An identical set of no-till plots was added immediately north of the present experiment in 1997 to compare crop and soil parameters during early stages of no-till adoption with that for a long-term no-till system and a moldboard plough system.
The experiment has 10 treatments replicated four times. Plots measure 2.4 x30.4m. The experiment is fully phased.
Number of plots
Number of replicates
Number of harvests per year
nitrogen fertilizer exposure
In 1994 N rates were adjusted down to align with those used in other long-term experiments.