کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10144853 | 1646312 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of critical nitrogen concentration and dilution curve based on leaf area index for summer maize
ترجمه فارسی عنوان
تعیین غلظت نیتروژن حیاتی و منحنی رقت بر اساس شاخص سطح برگ برای ذرت تابستانی
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کلمات کلیدی
ذرت تابستانی، غلظت نیتروژن بحرانی، شاخص منطقه برگ، شاخص تغذیه نیتروژن،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
Injudicious nitrogen (N) fertilizer application has increased the risk of environmental pollution and decreased grain yields, farm profits, and N use efficiency. The plant based N diagnostic tools can be used to optimize N management of summer maize production. This study was designed to develop and validate a leaf area index (LAI) based critical N (Nc) dilution curve and to establish a theoretical framework to link the relationship of LAI and plant dry matter (DM) based curves, as well as to compare the differences between LAI, plant DM and growth stage-based Nc curves. Six field experiments were set with a range of N application rates (0-320âkg N haâ1) and plant densities (6 to 8âÃâ104 plants ha-1) using four summer maize cultivars (Zhengdan958, Denghai605, Xundan20, and Denghai661) in Henan province of China. LAI and plant N concentration (PNC) were determined from V6 to R1 stages in each experiment for the development of the Nc curve. LAI and PNC ranged from 1.28 to 6.12 and 1.34% to 3.31% under different N levels, respectively. Allometric relationships between LAI, plant DM, and critical N uptake (Nuc) were developed under non-N-limiting treatments. The relationship between Nc and LAI during vegetative growth period was described by a power function (Ncâ=â3.84LAIâ0.45). N nutrition index (NNI) increased with the increasing N application rate and ranged from 0.56 and 1.23 across different N treatments. Our results validated that plant N uptake was proportional with LAI, and the allometric parameter between LAI and plant DM of summer maize was close to the theoretical value 2/3. The newly developed LAI-based Nc curve could identify plant N status (N-limiting and non-N-limiting) during key N requirement period of summer maize and can be used for precision N management for summer maize grown in China.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 228, 1 November 2018, Pages 195-203
Journal: Field Crops Research - Volume 228, 1 November 2018, Pages 195-203
نویسندگان
Ben Zhao, Syed Tahir Ata-Ul-Karim, Aiwang Duan, Zhandong Liu, Xiaolong Wang, Junfu Xiao, Zugui Liu, Anzhen Qin, Dongfeng Ning, Weiqiang Zhang, Yanhao Lian,