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首页> 外文期刊>Plant and Soil >Benefits of alternate partial root-zone irrigation on growth, water and nitrogen use efficiencies modified by fertilization and soil water status in maize.
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Benefits of alternate partial root-zone irrigation on growth, water and nitrogen use efficiencies modified by fertilization and soil water status in maize.

机译：根系交替灌溉对玉米生长，水分和氮素利用效率的影响，该效率因施肥和土壤水分状况而改变。

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摘要

Alternate partial root-zone irrigation (APRI) is a new water-saving technique and may improve crop water use efficiency without much yield reduction. We investigated if the benefits of APRI on biomass accumulation, water and nitrogen use efficiencies could be modified by different soil fertilization and watering levels in pot-grown maize (Zea mays L. cv. super-sweet No 28, a local variety). Three irrigation methods, i.e. conventional irrigation (CI), alternate partial root-zone irrigation (APRI, alternate watering on both sides of the pot) and fixed partial root-zone irrigation (FPRI, fixed watering on one side of the pot), two watering levels, i.e. water deficit (W1, 45-55% of field capacity) and well-watered (W2, 70-80% of field capacity), and two N fertilization levels, i.e. no fertilization and fertilization, were designed. Results showed that APRI and FPRI methods led to more reduction in transpiration than in photosynthesis, and thus increased leaf water use efficiency (leaf WUE, i.e. the ratio of leaf net photosynthetic rate to transpiration rate). Compared to the CI treatment, APRI and FPRI increased leaf WUE by 7.7% and 8.1% before the jointing stage and 3.6% and 4.2% during the jointing stage, respectively. Under the fertilization and well-watered conditions, APRI treatment saved irrigation water by 38.4% and reduced shoot and total dry masses by 5.9% and 6.7%, respectively if compared to the CI treatment. APRI also enhanced canopy WUE (defined as the amount of total biomass per unit water used) and nitrogen (N) apparent recovery fraction (Nr, defined as the ratio of the increased N uptake to N applied) by 24.3% and 16.4%, respectively, indicating that effect of APRI can be better materialized under appropriate fertilization and water supply..
机译：交替的局部根区灌溉（APRI）是一种节水新技术，可以在不降低产量的情况下提高农作物的水分利用效率。我们调查了是否可以通过盆栽玉米的不同土壤肥力和浇水水平（Zea mays L. cv。超甜28号，一种本地品种）来改变APRI对生物量积累，水和氮的利用效率的益处。三种灌溉方法，即常规灌溉（CI），交替的局部根区灌溉（APRI，在花盆的两侧交替浇水）和固定的局部根区灌溉（FPRI，在花盆的一侧固定浇水），两种设计了浇水水平，即缺水（W1，田间持水量的45-55％）和灌溉良好的水（W2，田间持水量的70-80％），以及两个氮肥水平，即不施肥和施肥。结果表明，APRI和FPRI方法导致的蒸腾作用比光合作用的减少更多，从而提高了叶片的水分利用效率（叶片WUE，即叶片净光合速率与蒸腾速率的比率）。与CI处理相比，APRI和FPRI在拔节前分别提高叶片WUE 7.7％和8.1％，在拔节前分别提高3.6％和4.2％。在施肥和灌溉条件良好的条件下，与CI处理相比，APRI处理可节省38.4％的灌溉水，并使茎干和总干重分别减少5.9％和6.7％。 APRI还使冠层WUE（定义为每单位水使用的总生物量）和氮（N）表观回收率（Nr，定义为增加的N吸收量与施用的N的比率）分别提高了24.3％和16.4％。 ，表明在适当的施肥和供水条件下，APRI的效果可以更好地实现。

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