کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11012950 1797857 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A New Critical Nitrogen Dilution Curve for Rice Nitrogen Status Diagnosis in Northeast China
ترجمه فارسی عنوان
منحنی انحلال نیتروژن بحرانی جدید برای تشخیص وضعیت نیتروژن برنج در شمال شرقی چین
کلمات کلیدی
برنج ژاپنی، شاخص تغذیه نیتروژن، بهره وری استفاده نیتروژن، غلظت نیتروژن گیاه، مدیریت نیتروژن دقیق،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی
In-season diagnosis of crop nitrogen (N) status is crucial for precision N management. Critical N (Nc) dilution curve and N nutrition index (NNI) have been proposed as effective methods to diagnose N status of different crops. The Nc dilution curves have been developed for indica rice in the tropical and temperate zones and japonica rice in the subtropical-temperate zone, but they have not been evaluated for short-season japonica rice in Northeast China. The objectives of this study were to evaluate the previously developed Nc dilution curves for rice in Northeast China and to develop a more suitable Nc dilution curve in this region. A total of 17 N rate experiments were conducted in Sanjiang Plain, Heilongjiang Province in Northeast China from 2008 to 2013. The results indicated that none of the two previously developed Nc dilution curves was suitable to diagnose N status of the short-season japonica rice in Northeast China. A new Nc dilution curve was developed and can be described by the equation Nc = 27.7W−0.34 if W ≥ 1 Mg dry matter (DM) ha−1 or Nc = 27.7 g kg−1 DM if W < 1 Mg DM ha−1, where W is the aboveground biomass. This new curve was lower than the previous curves. It was validated using a separate dataset, and it could discriminate non-N-limiting and N-limiting nutritional conditions. Additional studies are needed to further evaluate it for diagnosing N status of different rice cultivars in Northeast China and develop efficient non-destructive methods to estimate NNI for practical applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Pedosphere - Volume 28, Issue 5, October 2018, Pages 814-822
نویسندگان
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