کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6375052 | 1624713 | 2013 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of planting date on maize: Phenology, thermal time durations and growth rates in a cool temperate climate
ترجمه فارسی عنوان
اثر تاریخ کاشت بر ذرت: فنولوژی، مدت زمان حرارتی و نرخ رشد در آب و هوای معتدل سرد
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کلمات کلیدی
TminTMLCRMENVCgrintercepted photosynthetically active radiationtmaxPhysiological maturity - بلوغ فیزیولوژیکیPlanting date - تاریخ کاشتBase temperature - دمای پایهCrop growth rate - سرعت رشد محصولHarvest index - شاخص برداشتkernel number - شماره هستهIPAR - صنعتGrain yield - عملکرد دانهEnvironment - محیط زیستLeaf area - منطقه برگkernel weight - وزن هسته ای
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
چکیده انگلیسی
Delayed planting either reduced (Waikato) or increased (Manawatu) the emergence-flowering duration and this was associated with changes in leaf number and phyllochron length. The phyllochron averaged 47 °Cd, but increased to 51 °Cd when soil temperature, radiation and precipitation between emergence and tassel initiation were respectively >22 °C, â¤17 MJ mâ2 dâ1 and â¤30 mm. Sub-optimal temperatures and radiation under late plantings triggered a source limitation, leading to assimilate remobilization, reduced grain filling duration and resulted in higher grain moistures at physiological maturity (36% vs. 30%). When rainfall between emergence and flowering was â¥234 mm, increases in average daily irradiance (19.5-21.4 MJ mâ2 dâ1) and mean temperature (15-18 °C) increased pre-flowering crop growth rate (CGR) by 1 g mâ2 (°Cd)â1. With late planting, higher pre-flowering radiation (â¥21 MJ mâ2 dâ1) and temperatures (â¥17 °C) increased CGR while low post-flowering radiation (13 MJ mâ2 dâ1) and temperature (15.7 °C) reduced CGR. Kernel growth rate (KGR) was more stable across PDs and hybrids when TT was used (0.36-0.38 mg (°Cd)â1). Provided temperature was â¥19 °C, low daily irradiance (11 MJ mâ2 dâ1) did not significantly reduce KGR. More rapid leaf senescence occurred for early and late plantings, and this was attributed to source-sink imbalances caused by assimilate accumulation or shortage. Leaf senescence rates in the absence of water stress were 0.03% (°Cd)â1 between anthesis and mid grain-fill, and increased to 0.2% (°Cd)â1 towards the end of grain filling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 150, 20 August 2013, Pages 145-155
Journal: Field Crops Research - Volume 150, 20 August 2013, Pages 145-155
نویسندگان
Rowland Tsimba, Gregory O. Edmeades, James P. Millner, Peter D. Kemp,