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首页> 外文期刊>Irrigation Science >Alternate partial root-zone irrigation improves fertilizer-N use efficiency in tomatoes.
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Alternate partial root-zone irrigation improves fertilizer-N use efficiency in tomatoes.

机译：交替进行局部根区灌溉可提高番茄的氮肥利用率。

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摘要

The objective of this study was to investigate the comparative effects of alternative partial root-zone irrigation (PRI) and deficit irrigation (DI) on fertilizer-N use efficiency in tomato plants under mineral N and organic N fertilizations. The plants were grown in split-root pots in a climate-controlled glasshouse and were subjected to PRI and DI treatments during early fruiting stage. When analyzed across the N fertilizer treatments, PRI treatment led to significantly higher N yield, agronomic N use efficiency (ANUE), and apparent N recovery efficiency (ANRE) as compared with the DI treatment, indicating significantly higher fertilizer-N use efficiency and soil N availability as well as enhanced plant's N acquisition ability in the PRI treatment. Analysis across the irrigation treatments showed that the mineral N fertilizer treatment (MinN) significantly increased N yield, ANUE and ANRE relative to the organic N fertilizer treatment (OrgN). Compared with DI, the rhizosphere and bulk soil mineral N content in the soil were significantly lowered in the PRI treatment, indicating the enhanced root N uptake efficiency. It is suggested that PRI-enhanced soil water dynamics may have increased soil nitrate mass/diffusive flow to the root surfaces and root N uptake efficiency in the wetting soil and stimulated soil N mineralization and plant N demand, contributing to the improved fertilizer-N use efficiency in the PRI relative to the DI treatment.
机译：这项研究的目的是研究在氮素和有机氮肥水平下，交替局部根区灌溉（PRI）和亏缺灌溉（DI）对番茄植物氮肥利用率的比较效果。这些植物生长在气候受控的温室中的开根花盆中，并在结实初期进行了PRI和DI处理。当对氮肥处理进行分析时，与去离子处理相比，PRI处理可显着提高氮素产量，农艺氮利用效率（ANUE）和表观氮回收效率（ANRE），表明氮肥使用效率和土壤均显着提高。在PRI处理中氮的有效性以及增强的植物氮吸收能力。整个灌溉处理的分析表明，相对于有机氮肥处理（OrgN），矿物氮肥处理（MinN）显着提高了氮素产量，ANUE和ANRE。与DI相比，PRI处理显着降低了根际和土壤中的土壤矿质N含量，表明提高了根系N吸收效率。提示PRI增强的土壤水分动力学可能增加了土壤硝酸盐质量/向根表面的扩散流和湿润土壤中氮素的吸收效率，并刺激了土壤氮素的矿化和植物氮素的需求，从而促进了肥料氮素的使用PRI相对于DI处理的效率。

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