| This article has been：Browse 1289Times Download 2194Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2020714 |
|
| Irrigation and Phosphorus Fertilization Combine to Affect Uptake and Utilization of Phosphorus by Rice |
|
LI Hanchang, TAN Xin, LI Zonghao, ZHONG Cheng, LI Yan, YI Dali, ZHANG Wenping
|
|
1. College of Hydraulic and Civil Engineering, Hunan Agricultural University, Changsha 410128, China; 2. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
|
| Abstract: |
| 【Background and Objective】Fertilization and irrigation are central to modern agriculture, but their utilization efficiency by crops is low in most countries including China. The aim of this paper is to experimentally study how phosphorus (P) fertilization and irrigation can be optimized to improve uptake and utilization of P by rice at tillering and jointing stages respectively.【Method】The experiment was conducted in pots, with the hybrid variety of C Liangyou 608 used as the model plant and P2O5 as the P fertilizer. The experiment consisted of four P fertilizations: 0 (P1), 0.18 (P2), 0.36 (P3), 0.54 g/kg (P4), and two irrigations: alternate wet and dry irrigation (AI), and alternate wet and dry coupled with oxygenated irrigation (AO). In each treatment, we measured the change in available soil P and P taken up by the plant at tillering and jointing stages, respectively.【Result】Regardless of the growth stage, the P content in the above-ground part was higher than that in the below-ground part. The P content in rice tissues and the accumulated P in whole plant were higher at the jointing stage than at the tillering stage. P fertilization and irrigation impacted both available soil P and P uptake significantly, and their impacts were integrative. Combining P3 and AO increased P accumulation and P uptake efficiency the most at the jointing stage, reaching 0.218 g/per plant and 19.33% respectively. Under alternate wet and dry irrigation, the available soil P was positively correlated with P accumulation and P content in plant tissues at significant level. Irrigation significantly increased P uptake by rice roots. Under alternate wet and dry coupled with aerated irrigation, the available soil P was negatively correlated with P uptake efficiency at the jointing stage.【Conclusion】Our results indicated that AO irrigation coupled with 0.36 g/kg P fertilization is optimal for improving P uptake and its use efficiency, with P accumulation in the plant peaking at the jointing stage. |
| Key words: rice; irrigation method; available soil P; P uptake; P accumulation; P uptake efficiency |
|
|
