کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4927430 1431828 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research paperControlled release urea improved crop yields and mitigated nitrate leaching under cotton-garlic intercropping system in a 4-year field trial
ترجمه فارسی عنوان
اوره آزگار کنترل شده باعث بهبود عملکرد محصول و کاهش میزان اشباع نیترات در سیستم کشت مخلوط پنبه-سیر در یک دوره 4 ساله
کلمات کلیدی
کنترل اوره اوره سیستم مخلوط پنبه و سیر، اشباع نیترات،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی


- A one-third decrease of controlled release urea maintains cotton yield in a 4-year field trail compared with urea.
- Controlled release urea outperformed granular urea fertilizer in decreasing NO3−-N leaching to deep soil layer.
- Four-years CRU fertilization with one-third less applied rate preserved the soil fertility.

Nitrogen fertilization is important for improving crop yields, but excessive amounts lead to high N losses through nitrate (NO3−-N) leaching. Controlled-release urea (CRU) has been shown to increase crop yields, yet the long term effects of CRU on soil NO3−-N distribution are not well known. A 4-year field experiment applied 50% (100 kg ha−1), 100% (200 kg ha−1) and 150% (300 kg ha−1) of the local practice N rates with CRU and urea was conducted under cotton-garlic intercropping system in Shandong Province, China. The linear increase in garlic yield and curvilinear increase in cotton yield indicates that crop yields increased as the input N rate increased with both urea and CRU while exceeded N application decreased cotton yields. The successive release of N from CRU permitted the meeting of the full N requirements of crops grown. Consequently, the lint cotton yield of CRU treatments was increased by 5.2%-17.3%, and garlic bulb yield increased by 2.0%-7.4%, compared with urea treatment. Although the CRU100% supplied one-third less N than Urea150%, the CRU100% produced −0.6%-5.6% more cotton, and −4.0%-2.6% more garlic than Urea150%. The NO3−-N contents of CRU treatments were augmented in 0-40 cm soil, but the opposite trend was found in 60-100 cm soil. The organic matter and total N contents in 0-40 cm profile were increased with CRU fertilization over 4-year fertilization. However, no prominent difference of available P and K contents in 0-20 cm soil was observed between CRU and urea treatments. Thus a one-third decrease in the recommended N application rate of urea is possible with CRU while maintaining crops yield, decreasing NO3−-N leaching to deep soil layer and preserving the soil fertility in North China plain.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 175, January 2018, Pages 158-167
نویسندگان
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