| Cite this article: | 孙梦媛,刘景辉,米俊珍,等.控释尿素减施对旱作马铃薯氮素诊断指标、产量及水分利用效率的影响[J].灌溉排水学报,0,():-. |
| SUN Mengyuan,LIU Jinghui,MI Junzhen,et al.控释尿素减施对旱作马铃薯氮素诊断指标、产量及水分利用效率的影响[J].灌溉排水学报,0,():-. |
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| Effects of the Reduction of Controlled-release Urea Application on Nitrogen Status Indicators,Yield and Water Use Efficiency of Rainfed Potato |
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SUN Mengyuan, LIU Jinghui, MI Junzhen, ZAHNG Lanying, WANG Ying
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Agricultural College,Inner Mongolia Agricultural University
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| Abstract: |
| Abstract：【Objective】 To investigate the effects of controlled-release urea on potato nitrogen status indicators， yield，nitrogen partial productivity and water use efficiency，so as to provide a reasonable fertilization management model for the dryland farming systems.【Method】A field experiment was conducted to compare common urea(CF) and reduction of controlled-release urea (CRU) in Chl，NBI，Flav，nitrogen partial productivity，water use efficiency and yield of potato field. Fertilization treatments included ?no?fertilization (CK)，conventional urea ( CF，200 kg N/hm2)，and three controlled-release urea fertilization levels，CRU1，CRU2 and CRU3，which represented 10%，20% and 30% reduction of fertilizer inputs relative to CF，respectively. 【Result】 The leaf Chl and NBI increased with N rates，whereas Flav decreased. The different growth stage and different fertilization significantly affects the Chl，NBI and Flav (P < 0.01)，but the fertilization and growth stage of interaction is not significant difference (P > 0.05). By comparing the correlation between Chl，NBI，Flav and yield under different growth periods and treatments，it was found that NBI and Flav had higher correlation with yield during tuber expansion stage. With the reduction of N application rate，tuber yield and tuber weight per plant decreased. CRU1 compared with the common urea (CF) was not significantly reduced tuber yield (P >0.05)，and the commodity rate increased but minituber rate decreased. Water consumption in the five treatments was in the order of CF＞CRU1＞CRU2＞CRU3＞CK，but the difference among the treatments was insignificant (P >0.05). Water use efficiency in the five treatments was in the order of CF＞CRU1＞CRU2＞CRU3＞CK，with their associated value being 51.45，94.40，92.25，87.00 and 84.60 kg/（hm2·mm) respectively. CRU1 compared with the common urea (CF) was not significantly reduced water use efficiency (P >0.05). Compared to common urea (CF)，CRU1 increased nitrogen partial productivity by 5.63%.【Conclusion】Our findings suggested that the use of CRU would permit a reduction in N application by 10%，which could maintain the potato yield and water use efficiency，increase nitrogen partial productivity．NBI and Flav could be integrated to evaluate N status of potato. |
| Key words: nitrogen status indicators；controlled-release Urea；yield；water use efficiency；nitrogen partial productivity |
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