[Effects of free-air CO2 enrichment (FACE) on phosphorus nutrition of Oryza sativa at its different growth stages].
Using free-air CO2 enrichment (FACE) platform and under different nitrogen supply level, this paper studied the phosphorus nutrition of Oryza sativa at its different growth stages. The CO2 concentration of FACE platform was 200 micromol.mol(-1) more than that in ambient air, and the nitrogen supply levels were 150 kg.hm(-2), 250 kg.hm(-2) and 280 kg.hm(-2). The results showed that during rice growth period, FACE significantly increased the phosphorus content of rice plant and its phosphorus uptake by 3.9%-20.6% and 28.9%-71.4%, respectively. Before heading, FACE had little effect on the phosphorous accumulation in leaf or stake, but after heading, made the proportion of phosphorus accumulation in reproductive organ decreased by 9.8%-26.3% and that in vegetative organ increased by 2.2%-23.9% at 0.01 or 0.05 significant level. Under FACE treatment, the phosphorus use efficiency for biomass production (PUEp) at different growth stages, the phosphorus use efficiency for grain output (PUEg), and the phosphorus harvest index (PHI) were decreased by 3.7%-16.6%, 6.5% -15.5%, 5.4%-9.0%, respectively. Nitrogen supply level and its interaction with FACE had less effect on the phosphorus-nutrition of rice at its different growth stages.
Yang
Lianxin
L
Agriculture College of Yangzhou University, Yangzhou 225009, China. lxyang@yzu.edu.cn
Yang
Hongjian
H
Huang
Jianye
J
Wang
Yulong
Y
Zhu
Jianguo
J
Liu
Hongjiang
H
Dong
Guichun
G
Shan
Yuhua
Y
D002245:Carbon Dioxide / Q000032:analysis*; D005308:Fertilizers / Q000032:analysis; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D010758:Phosphorus / Q000494:pharmacology*
D005308:Fertilizers; D002245:Carbon Dioxide; D010758:Phosphorus