| 引用本文: | 李汉常,谭 歆,李宗浩,等.施磷量和灌溉方式对水稻磷素吸收利用的影响[J].灌溉排水学报,2021,(6):45-52. |
| LI Hanchang,TAN Xin,LI Zonghao,et al.施磷量和灌溉方式对水稻磷素吸收利用的影响[J].灌溉排水学报,2021,(6):45-52. |
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| 摘要: |
| 【目的】探明施磷量和灌溉方式对水稻分蘖期、拔节孕穗期磷素吸收利用的影响。【方法】以杂交稻C两优608为材料进行盆栽试验，分别设置P1（0 g/kg）、P2（0.18 g/kg）、P3（0.36 g/kg）、P4（0.54 g/kg）4个施磷水平，及干湿交替灌溉（AI）、增氧+干湿交替灌溉（AO）2种灌溉方式，系统研究了分蘖期及拔节孕穗期水稻土壤有效磷量、植株磷素吸收特性的变化及其相关性。【结果】无论是分蘖期还是拔节孕穗期，地上部磷吸收量均高于地下部，拔节孕穗期各器官磷吸收量、植株磷累积量均高于分蘖期。施磷、灌溉方式对水稻各器官磷吸收量、植株磷累积量、土壤有效磷量及磷吸收利用率影响极显著；施磷与灌溉互作对各器官磷吸收量、植株磷累积量、土壤有效磷量及分蘖期磷吸收利用率影响极显著，增氧+干湿交替灌溉下拔节孕穗期P3水平水稻磷累积量、磷吸收利用率均最高，分别为0.218 g/株、19.33%。干湿交替灌溉下土壤有效磷量与植株磷累积量、各器官磷吸收量极显著正相关；灌溉方式显著提高水稻根系对磷的吸收量；增氧+干湿交替灌溉方式下拔节孕穗期土壤有效磷量与磷吸收利用率显著负相关。【结论】增氧+干湿交替灌溉方式配施磷量0.36 g/kg时，水稻拔节孕穗期植株磷累积量最高。 |
| 关键词: 水稻；灌溉方式；土壤有效磷量；磷吸收量；磷累积量；磷吸收利用率 |
| DOI：10.13522/j.cnki.ggps.2020714 |
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| Irrigation and Phosphorus Fertilization Combine to Affect Uptake and Utilization of Phosphorus by Rice |
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LI Hanchang, TAN Xin, LI Zonghao, ZHONG Cheng, LI Yan, YI Dali, ZHANG Wenping
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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
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| 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 |
