| Cite this article: | 李帅,卫琦,王海渝,等.水肥一体化条件下控灌稻田土壤氮素及水稻生长特性研究[J].灌溉排水学报,0,():-. |
| LI Shuai,WEI Qi,WANG Haiyu,et al.水肥一体化条件下控灌稻田土壤氮素及水稻生长特性研究[J].灌溉排水学报,0,():-. |
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| Soil Nitrogen And Rice Growth Characteristics As Effected By Fertigation In Paddy Field Irrigated By Controlled Irrigation |
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LI Shuai1, WEI Qi1, WANG Haiyu1, XU Junzeng1, ZHOU Jiaoyan2
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1.College of Agricultural Science and Engineering, Hohai University;2.Kunshan City Water System Dispatching and Information Management Office
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| Abstract: |
| 【Objective】 Investigating the dynamics of soil nitrogen and rice growth in irrigated paddy fields under fertigation management, can provide theoretical guidance for optimizing water and fertilizer management, improving nitrogen use efficiency and reducing non-point source pollution. 【Methods】 Taking rice panicle fertilizer application as an example, plot experiments with different fertilization methods and strategies were carried out, to study soil nitrogen distribution, rice growth and yield in controlled irrigation paddy fields under different fertilization management conditions. Two experimental factors were facility fertilizer method (H for handbroadcasting application, A for fertugation), fertilizer amount and frequency (F for conventional fertilization level 367 kg/hm2, R for reduced fertilization level 267 kg/hm2), and the total of four treatments were HR, AR, HF and AF. 【Result】(1) Under the fertigation application，soil NH4+-N content was increased by 27.4%-50.7% (p<0.05) and NO3--N content was decreased by 15.2%-33.3% (p<0.05), meanwhile distribution uniformity of NH4+-N and NO3--N in paddy soil increased by 31.0% and 41.0%. (2) The tiller number and rice height were increased by 7.5% and 17.4% on average (p<0.05), and the rice yield was increased by 16.4% on average under the fertigation application. (3) Compared with one topdressing, two topdressing treatments could effectively increase tillering by 8.5%~9.4%, rice height by 3.7%~4.0%, and yield by 6.3%~7.1%, and maintain the appropriate and stable NH4+-N content in paddy soil for a long time. (4) Compared with the traditional water and fertilizer management mode, fertigation combined with the "reduction and subdivision" fertilization management mode not only reduced the fertilizer loss during the fertilization process, but also effectively avoided the excessive loss of nitrogen caused by high nitrogen concentration in the paddy field, and improved the content of ammonium nitrogen and the distribution uniformity of nitrogen in the paddy soil. It is a water and fertilizer management strategy with the potential to improve soil nitrogen availability, reduce nitrogen loss and non-point source pollution emissions.【Conclusion】 Fertigation combined with the " reduction and subdivision " fertilization management can effectively not only improve the soil NH4+-N content in controlled irrigated paddy field, but also promote the growth and yield of rice.Besides, it can further improvie the soil nitrogen distribution uniformity, efficiency of nitrogen utilization and reduced nitrogen leaching loss. |
| Key words: fertilization method; controlled irrigation; paddy fields; soil nitrogen; rice growth. |
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