کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8879160 | 1624640 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nitrogen fertilization modifies maize yield response to tillage and stubble in a sub-humid tropical environment
ترجمه فارسی عنوان
کود نیترات پاسخ عملکرد ذرت به کشت و زراعت را در محیط گرمسیری مرطوب تغییر می
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کلمات کلیدی
SSAN agronomic efficiencyN recovery efficiencyCgrNHINUENNIN physiological efficiencyWUEN nutrition indexNREN harvest indexRainfall - بارش باران یا بارانNo-till - بدون بهInteractions - بر هم کنشWater use efficiency - بهره وری استفاده از آبN use efficiency - بهره وری استفاده شودTonnes - تنdry mass - جرم خشکsouth - جنوبSub-Saharan Africa - جنوب صحرای آفریقاCrop growth rate - سرعت رشد محصولNitrogen nutrition index - شاخص تغذیه نیتروژنConventional tillage - شخم زدن معمولیEAST - شرقNitrogen - نیتروژنhectare - هکتارconservation agriculture - کشاورزی حفاظتیkilogram - کیلوگرم
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
Controversy around the benefits of NT and stubble retention, and weaknesses in the underpinning science arise from a limited understanding of the mechanisms that operate in these systems. Two experiments were conducted at the Kenya Agricultural and Livestock Research Organization research station in Embu (0.515°S and 37.273°E) over three seasons during the 2015 long rains, 2015/2016 short rains and 2016 long rains to explore the mechanisms that regulate crop growth, nitrogen uptake and yield in maize (Zea mays L.). In the first experiment, crops were grown in a factorial combination of conventional tillage (CT) and no-till (NT), three amounts of stubble (0, 3 and 5â¯tâ¯haâ1) and three N rates (0, 80 and 120â¯kgâ¯Nâ¯haâ1). The second experiment investigated the interaction between tillage (CT, NT) and timing of N supply (80â¯kgâ¯Nâ¯haâ1) that was supplied at sowing, six- (V6) and 12-leaf stage, with 5â¯tâ¯haâ1 of stubble. Grain yield ranged from 2.3 to 5.3â¯tâ¯haâ1, with small effects from tillage and stubble retention. Nitrogen had the largest impact on grain yield and influenced crop response to tillage and stubble by modifying crop growth rate (CGR) and nitrogen nutrition index (NNI). However, the effects of N timing on crop growth, yield and traits associated with N use efficiency were independent of tillage system. High CGR between V6 and flowering was associated with high NNI, which led to increased grain number. The value of stubble in water storage at sowing, and crop growth and yield was greater in a dry season (<300â¯mm rainfall) compared with wet seasons (>600â¯mm). Irrespective of tillage system, moderate amounts of stubble, higher N rates and better matching of N supply to the critical window for yield determination could improve maize yields in sub-humid tropical environments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 223, 15 June 2018, Pages 113-124
Journal: Field Crops Research - Volume 223, 15 June 2018, Pages 113-124
نویسندگان
Onesmus M. Kitonyo, Victor O. Sadras, Yi Zhou, Matthew D. Denton,