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ضریب استهلاک و کارایی مصرف تشعشع ارقام پنبه برای تراکمهای مختلف کاشت در گرگان | ||
| پژوهش های پنبه ایران | ||
| مقاله 2، دوره 1، شماره 2، آبان 1392، صفحه 15-28 اصل مقاله (760.8 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijcr.2013.100727 | ||
| نویسندگان | ||
| سید مجید عالیمقام* 1؛ فرشید قادری فر2؛ افشین سلطانی2؛ امید سپهری3 | ||
| 1دانشآموخته کارشناسیارشد اگرواکولوژی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| 2عضو هیاتعلمی گروه زراعت، دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| 3دانشآموخته کارشناسیارشد زراعت، دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| چکیده | ||
| افزایش عملکرد از طریق آگاهی از تاثیر عوامل مدیریتی بر گیاهان و به دنبال آن استفاده حداکثر از ظرفیت محیط، قابل دسترسی است. استفاده از مدلهای شبیهسازی رشد گیاهی، یکی از راهکارهای مفید جهت شناسایی تاثیر عوامل مختلف مدیریتی بر عملکرد میباشد. اما استفاده از مدلها در صورتی امکانپذیر است که اطلاعات اولیه برای هر گیاه در هر منطقه موجود باشد. در همین راستا به منظور بررسی تاثیر ارقام مختلف پنبه (گلستان، ساحل و سپید) در دو تراکم (250000 و 62500 بوته در هکتار) بر روی ضریب خاموشی و کارایی مصرف تشعشع، آزمایشی در گرگان به صورت کرتهای خرد شده در قالب طرح بلوکهای کامل تصادفی در سه تکرار در سال 1390 انجام شد. نتایج آزمایش نشان داد که اثر ارقام بر ضریب خاموشی و کارایی مصرف تشعشع معنیدار نبود. با افزایش تراکم بوته در واحد سطح، ضریب خاموشی به صورت معنیداری از 0/87 به 0/61 کاهش یافت. این در حالی بود که کارایی مصرف تشعشع در تراکم 62500 بوته در هکتار، برابر 1/35 و در تراکم 250000 بوته در هکتار، برابر 3/17 گرم بر مگاژول به دست آمد. در تراکم کشت بیشتر، افزایش شاخص سطح برگ و بسته شدن سریعتر کانوپی در زمانهای وقوع دمای بیشتر هوا، باعث افزایش کارایی مصرف تشعشع شد. | ||
| کلیدواژهها | ||
| پنبه؛ ضریب خاموشی؛ کشت باریک؛ کارایی مصرف تشعشع | ||
| عنوان مقاله [English] | ||
| Extinction coefficient and radiation use efficiency of cotton varieties for different planting densities in Gorgan | ||
| نویسندگان [English] | ||
| S.M. Alimagham1؛ F. Ghaderi-Far2؛ A. Soltani2؛ O. Sepehri3 | ||
| 1M.Sc graduated student of Agroecology, Gorgan University of Agricultural Science and Natural Resources | ||
| 2Department of Agronomy, Gorgan University of Agricultural Science and Natural Resources | ||
| 3M.Sc graduated student of Agronomy, Gorgan University of Agricultural Science and Natural Resources | ||
| چکیده [English] | ||
| Knowledge of management factors effect on plants and consumption the maximum capacity of environment can increase crop yield. Application of crops growth simulation models is a valuable approach to identify the impact of various management factors on yield. If the necessary information of each crop in each region is accessed, it is possible to use crop growth models. The aim of this study was to evaluate effect of planting density (250000 and 62500 plants per hectare) and cotton varieties (Golestan, Sepid and Armaghan) on extinction coefficient and radiation use efficiency. The experiment was carried out as split plot design based on randomized complete block design whit three replications in 2011. The plant density was as main plot factor while cotton varieties were considered as sub-plot factor. The results showed that effect of variety on the extinction coefficient and radiation use efficiency was not significant. Extinction coefficient decreased significantly from 0.87 to 0.61 when plant density was increased. However, the radiation use efficiency was 1.35 and 3.17 g.MJ-1 respectively for 62500 and 250,000 plants per hectare density. Higher plant density increased leaf area index and canopy closure at higher temperatures which caused to increase the radiation use efficiency in 250,000 plants density. | ||
| کلیدواژهها [English] | ||
| cotton, extinction coefficient, Narrow planting, Radiation use efficiency | ||
| مراجع | ||
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