Relationship between grain yield and N accumulation in
aboveground biomass from on-farm experiments: Maize (n=470),
rice (n = 1658)
From Cassman et al., 2002, AMBIO
第 4 页 / 共 26 页
Plant N accumulation (kg N ha
-1
)
0 50 100 150 200 250 300 350
Grain yield (kg DM ha
-1
)
0
2000
4000
6000
8000
10000
12000
14000
16000
Rice
y = -1573 + 643 x
0.5
R
2
= 0.55
Maize
y = -3710 + 995 x
0.5
R
2
= 0.76
Rice (avg. 1.0% N in DM, 1.2% N in grain)
Maize (avg. 1.2% N in DM, 1.4% N in grain)