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| DOI：10.13522/j.cnki.ggps.2018347 |
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| Effect of Phosphorus Application on Activity of Root Acid Phosphatase and Yield of Rice under Oxygenatio |
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LIU Chongxian, ZHANG Wenping, ZHOU Weijun, ZHANG Wenjun, YAN Lijun
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1.College of Engineering, Hunan Agricultural University， Changsha 410128， China; 2.College of Resources and Environment，Hunan Agricultural University， Changsha 410128，China; 3.Key Laboratory for Crop Germplasm Innovation and Resources Using，Hunan Agricultural University， Changsha 410128， China; 4. Wenshui Natural Resources Bureau， Wenshui 032100， China
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| Abstract: |
| 【Objective】 The redox in soil controls plant growth and soil nutrient dynamics. The objective of this paper is to experimentally study the effect of phosphorous application and oxygenation on activity of root acid phosphatase and rice yield. 【Method】 The experiment was conducted in pots. We used the hybrid variety of C Liangyou 608 as model plant and P2O5 as the P fertilizer. We examined four P application levels: 0 g/plant (P1), 3.23 g/plant (P2), 6.46 g/plant (P3) and 9.70 g/plant (P4), and two irrigation methods: conventional irrigation without adding oxygen (NO) and with oxygenation(O). For each treatment, we measured the root acid phosphatase activity and the rice yield. 【Result】 With P application increasing, both effective panicle number and 1000-grain weight decreased first followed by a rise, while the grain number per panicle changed in opposite direction. Increasing P application suppressed root acid phosphatase activity at both tillering and jointing stage. At filling stage, increasing P application first promoted enzymatic activity and then suppress it if too much P was applied into the soil. Overall, seed setting was correlated with root acid phosphatase activity at jointing stage at significant level, while the 1000-grain weight rate was correlated with root acid phosphatase activity at filling stage at significant level under oxygenation. 【Conclusion】Oxygenation alone can significantly increase the yield, effective spike number and 1000-grain weight at the price of reducing grain number per panicle. On the contrary, increasing P application inhibited formation of yield. The theoretical yield of the rice was 6.46 g/plant (equivalent to 90 kg/hm2) under oxygenation. Our results suggested that the effective panicle number, 1000-grain weight and grain number per panicle can be used as indicators to assess the efficacy of oxygenation. The root acid phosphatase activity under oxygenation is an important indicator for response of rhizosphere activity to oxygenation and phosphorus application. |
| Key words: phosphorus application content; root acid phosphatase activity; yield indicators; rice; oxygenation |
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