کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5761622 | 1624659 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimal plant density and N fertilization to achieve higher seed yield and lower N surplus for winter oilseed rape (Brassica napus L.)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optimal plant density and N fertilization to achieve higher seed yield and lower N surplus for winter oilseed rape (Brassica napus L.) Optimal plant density and N fertilization to achieve higher seed yield and lower N surplus for winter oilseed rape (Brassica napus L.)](/preview/png/5761622.png)
چکیده انگلیسی
Greater synchrony between populations and individual plants is dependent on the interactions between plant density and nitrogen (N) fertilization and is crucial to achieve food and environment security. A two-factor designed experiment of transplanted winter oilseed rape was conducted in the 2012-2013 and 2013-2014 growing seasons in central China. Five transplanted plant densities and six N rates were used to study the influences of plant density and N fertilizer application rate on seed yield, N uptake and apparent N surplus. Optimal plant density was the prerequisite to obtain high seed yield and the contribution of plant density to seed yield was minor when it exceeded the optimal density. N fertilization offset the compensatory effect between plant density and pods per plant, enhance seed yield further. Seed yield increased linearly with the increase of seed N uptake, however, it did not increase as the non-seed parts (stem + pod wall) N uptake increased when seed yield exceeded the critical values in the high plant density treatments. Higher plant densities promoted shoot N uptake and reduced soil mineral N residues and apparent N surplus in root zone. Compared with the recommended transplanted density in this region (9.0 Ã 104 plant haâ1), the optimal N fertilizer application rate could be cut down with 10.3%-23.7% for the target yield (3000 kg haâ1) and apparent N surplus would be declined with 41.5%-92.1% when the density suitably increased to 10.0-12.0 Ã 104 plant haâ1; On the contrary, when the density was decreased to 7.0-8.0 Ã 104 plant haâ1, increasing N fertilization rate with 13.9%-34.8% also could gain the target yield, but the apparent N surplus would increase with 58.1%-148.0%. Consequently, varied combinations between plant densities and N fertilizer application rate are useful to fulfill high seed yield. Reducing N fertilizer rates under suitable higher plant densities are the optimal N management strategy to achieve high yield with lower environment risks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 204, 15 March 2017, Pages 199-207
Journal: Field Crops Research - Volume 204, 15 March 2017, Pages 199-207
نویسندگان
Tao Ren, Bo Liu, Jianwei Lu, Zhonghua Deng, Xiaokun Li, Rihuan Cong,