interaction effects between weed, sowing rate, and n splitting on yield of dryland wheat
نویسندگان
چکیده
to assess the interaction effects of weeds, sowing rate, and n splitting on dryland wheat yield, field experiments were conducted in two years (2007 and 2009) at the college of agriculture in shiraz university. the treatments were replicated four times and analyzed as a split- split plot in a randomized complete block. the weedy and weed free were treated as the main plots, the wheat sowing rates treated as the sub plots (100, 120, 140 and 160 kg seed ha-1) and 5 levels (0-1, 1/3-2/3, 1/2-1/2, 2/3-1/3, and 1-0 ) of n splitting (100 kg ha-1) as the sub- sub plots. results showed that by interaction between weeds, sowing rates and n splitting, the maximum biological yield (699 kg ha-1 and 1449.5 kg ha-1 in the first and the second year, respectively) was obtained in weed free, 120 kg seed ha-1 sowing rate and n splitting of 1/3-2/3. in the first year by interaction between weeds, sowing rates and n splitting, the highest grain yield (440.07 kg ha-1) was obtained in weed free, 120 kg seed ha-1 sowing rate and n splitting of 1/3-2/3 and the lowest grain yield (47.7 kg ha-1) was obtained in weedy plots with 100 kg seed ha-1 and n splitting of 0-1. in this study, the highest weed dry matter (367.5 kg ha-1 and 160.38 kg ha-1 in the first and the second year, respectively) was obtained in sowing rate of 100 kg seed ha-1 and the lowest weed dry matter (247.5 kg ha-1 and 52.3 kg ha-1 in the first and the second year, respectively) was obtained in sowing rate of 160 kg seed ha-1. in 2009, unusually low temperature in reproduction stage adversely affected wheat and led to no grain yield production.
منابع مشابه
effect of seed priming and irrigation regimes on yield,yield components and quality of safflowers cultivars
این مطالعه در سال 1386-87 در آزمایشگاه و مزرعه پژوهشی دانشگاه صنعتی اصفهان به منظور تعیین مناسب ترین تیمار بذری و ارزیابی اثر پرایمینگ بر روی سه رقم گلرنگ تحت سه رژیم آبیاری انجام گرفت. برخی از مطالعات اثرات سودمند پرایمینگ بذر را بر روی گیاهان مختلف بررسی کرده اند اما در حال حاضر اطلاعات کمی در مورد خصوصیات مربوط به جوانه زنی، مراحل نموی، عملکرد و خصوصیات کمی و کیفی بذور تیمار شده ژنوتیپ های م...
the effects of speech rate,prosodic features, and blurred speech on iranian efl learners listening comprehension
کلید واژه ها به زبان انگلیسی: effect of speech rate on listening comprehension, blurred speech,segmental and suprasegmental features,authentic speech,intelligibility, discrimination, omission, assimilation چکیده: سرعت مطالب شنیداری در کلام پیوسته بطور کلی همواره کابوسی بوده برای یادگیرنده های زبان دوم و بالاخص برای شنوندگان ایرانی. علی رغم عقل سلیم که کلام با سرعت کندتری فعالیتهای درک مطلب شن...
15 صفحه اولUsing simulation models to investigate the cumulative effects of sowing rate, sowing date and cultivar choice on weed competition
With the increasing pressure on crop production from the evolution of herbicide resistance, farmers are increasingly adopting Integrated Weed Management (IWM) strategies to augment their weed control. These include measures to increase the competitiveness of the crop canopy such as increased sowing rate and the use of more competitive cultivars. While there are data on the relative impact of th...
متن کاملEffects of rainfall distribution on the dryland wheat yield with an economic analysis in southern proviences of I.R. Iran
متن کامل
Dryland Wheat Grain Yield and Yield Components as Affected by Slope Direction and Residue Rates
Limited information is available on the effect of residues rates and slope direction on dryland wheat (Triticum aestivum L.) yield. This study was carried out to determine the effects of residues rates and tillage direction on grain yield and yield components of the Sardary wheat in a dryland region in Zanjan. Five wheat residues rates (0, 25, 50, 75 and 100% surface cover) were applied and i...
متن کاملthe effects of planning on accuracy and complexity of iranian efl students’ written narrative task performance
this study compared the different effects of form-focused guided planning vs. meaning-focused guided planning on iranian pre-intermediate students’ task performance. the study lasted for three weeks and concentrated on eight english structures. forty five pre-intermediate iranian students were randomly assigned to three groups of guided planning focus-on-form group (gpfg), guided planning focus...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
حفاظت گیاهانجلد ۲۶، شماره ۲، صفحات ۰-۰
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023