Field experiment design
The experiment was designed as a randomized complete block,using three replications.
Four N rate treatments were applied:zero N (N0), 120 kg N hm−2 (N120), 210 kg N hm−2 (N210), and 300 kg N hm−2 (N300).
Half of the N was applied before sowing and half at jointing.
Three split N treatments were applied at the same rate (210 kg N hm−2) and split in various proportions
between sowing and jointing: 30/70% (N210[3/7]), 50/50%(N210[5/5]), and 70/30% (N210[7/3]). The area of each plot was24 m2 (4 m×6 m).
wintering