• فهرس المقالات Seed rate

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        1 - Optimum Seed Rate for Vigna sun-hum (Tagtaga) for Rangeland Rehabilitation in Sandy Soil of North Kordofan
        Ahmed M. M. Lazim Elnazir M. Daw-elbait Sahar Ezzat Salih. A. Elsheikh
        In order to determine the optimum rate of Vigna sun-hum seed sowing for rangeland rehabilitation in sandy soil of North Kordofan, Sudan, two trials were conducted separately under managed and unmanaged conditions at El-obeid Agricultural Research Farm in Sheikan localit أکثر
        In order to determine the optimum rate of Vigna sun-hum seed sowing for rangeland rehabilitation in sandy soil of North Kordofan, Sudan, two trials were conducted separately under managed and unmanaged conditions at El-obeid Agricultural Research Farm in Sheikan locality of North Kordofan State in 2015 and 2016. Seed rates were 1, 2, 3, 4 and 5 Kg/feddan (4200m) and arranged by a Completely Randomized Block Design with three replications. The species in both trials was established under rain-fed conditions by broadcasting seeds on prepared seed beds early in the rainy season. In the managed trial, seeds were broadcasted on a clean seed bed. The first and second weeding was carried out after two and four weeks from seed broadcasting. In the un-managed trial, a bare area or an area with scatter occurrence and low density of herbaceous species was selected annually and weeding was not done. Vegetation cover, density and forage dry weights were obtained using (50x50 cm²) quadrate. MSTAT-C statistical software package was used for the statistical analysis. In both managed and un- managed trials, the results revealed that there were significant (P≤0.001) differences in most measured variables. In the managed trial of 2015 cropping season, the seed rate of 3 kg/feddan recorded the highest vegetation cover (33.3%) and the highest dry weight (260.3 g/m²) whereas the one kg/feddan had the least vegetation cover (10%) and dry weight (52.1 g/m²). In un-managed trial of 2016 cropping season, the seed rate of 4 kg/feddan recorded the highest density (98 plant/m²) and the highest dry weight (100.3 g/m²) whereas the third seed rate recorded the least density (37 plant/m²) and dry weight (33.6 g/m²). Results of combined analysis indicated that there were significant (P<0.001) differences among the five seed rates in most studied parameters. For Vigna sun-hum as endangered leguminous range species, two optimum seed rates of 3 and 4 kg/feddan were recommended for ranches and natural rangeland rehabilitation in the managed and un-managed areas, respectively. تفاصيل المقالة
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        2 - Effects of seed rate and harvesting stage on agronomic performance and chemical composition of Rhodes grass (Chloris gayana K.) grown in northwestern Ethiopia
        Dawit Bogale Yeshambel Mekuriaw Bimrew Asmare
        The experiment was conducted in the 2018 cropping season with the objective of evaluating the effects of harvesting stage and seed rate on agronomic performance and quality traits of Rhodes grass (Chloris gayana K.) grown in northwestern Ethiopia under rain-fed conditio أکثر
        The experiment was conducted in the 2018 cropping season with the objective of evaluating the effects of harvesting stage and seed rate on agronomic performance and quality traits of Rhodes grass (Chloris gayana K.) grown in northwestern Ethiopia under rain-fed conditions. A factorial experiment was conducted using two factors of main factor harvesting stages in three levels (60, 90, and 120 days) and the sub-factor of seed rate in three levels (5, 10, and 15 Kg/h) using a Randomized Complete Block Design (RCBD) with three replications. Data were collected for morphological traits such as plant height, tillers number, leaf length, leaf number per plant, and quality traits such as crude protein (CP%), total ash, acid detergent fiber (ADF%), neutral detergent fiber (NDF%) and acid detergent lignin (ADL%). The data were subjected to ANOVA using SAS software. Results showed significant effects of seed rate by harvesting stage interaction on all plant morphological traits, DM yield, and quality traits (P<0.05). As the seed rate and harvesting stage increased, there was an increase in tiller number, leaf length, plant height, NDF, and ADL and ADF%. There were significant (P<0.05) increments in DM yield as the result of descending seed rate and advanced maturity. Also, CP and total Ash were markedly decreased as the harvesting stages were increased. It could be concluded that both seed rate and harvesting stage are important agronomic practices in Rhodes grass production; hence, 90 days harvesting stage and lower level of seed rate (5 kg/ha) are recommended for better yield and quality traits of Rhodes grass. تفاصيل المقالة
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        3 - بررسی کاربرد مقادیر مختلف بذر و سطوح مختلف نیتروژن در مرحله سنبله‌دهی بر ورس و عملکرد دانه لاین 18-81 N- گندم در دو منطقه از استان مازندران
        حمیدرضا مبصر مبصر رحمت اله حسینی الیاس رحیمی پطرودی
        به منظور بررسی اثرات مقادیر مختلف میزان بذر و سطوح نیتروژن در مرحله سنبله‌دهی کامل بر عملکرد و اجزای عملکرد گندم لاین 18-81-N در شرایط متفاوت آب و هوای استان مازندران، آزمایشی به صورت کرت‌های یک بار خرد شده در قالب طرح بلوک‌های کامل تصادفی در چهار تکرار در سال زراعی 89- أکثر
        به منظور بررسی اثرات مقادیر مختلف میزان بذر و سطوح نیتروژن در مرحله سنبله‌دهی کامل بر عملکرد و اجزای عملکرد گندم لاین 18-81-N در شرایط متفاوت آب و هوای استان مازندران، آزمایشی به صورت کرت‌های یک بار خرد شده در قالب طرح بلوک‌های کامل تصادفی در چهار تکرار در سال زراعی 89-88 در دو منطقه قراخیل و فریم در شهرستان‌های قائمشهر و ساری اجرا گردید. عامل اصلی شامل سه میزان بذر(200، 250 و 300 کیلوگرم در هکتار) و عامل فرعی شامل سه سطح نیتروژن در مرحله سنبله‌دهی کامل (0-5/17-5/34 کیلوگرم نیتروژن در هکتار که به ترتیب برابر0-5/37 و75 کیلوگرم اوره در هکتار) بود. نتایج نشان داد حرکت خمش در منطقه قراخیل (ارتفاع از سطح دریا 7/14متر) نسبت به منطقه فریم (ارتفاع از سطح دریا 725 متر) به خاطر کوتاه‌تر بودن طول میانگره، طول ساقه و کمتر بودن تعداد میانگره، وزن سنبله، و وزن‌ تر ساقه کمتر شد. با افزایش میزان بذر تا 300 کیلوگرم در هکتار حرکت خمش بخاطر کمتر بودن وزن‌ تر ساقه و سنبله کاهش معنی‌داری داشت و سطوح نیتروژن در مرحله سنبله‌دهی کامل اثر معنی‌داری بر حرکت خمش نداشته است. میزان عملکرد دانه در منطقه فریم 22/20% بیشتر از قراخیل بود که علت این امر به خاطر افزایش تعداد پنجه در بوته، تعداد سنبله در واحد سطح، افزایش وزن هزار دانه و تعداد دانه در سنبله بود. عملکرد دانه با مصرف زیاد نیتروژن در مرحله سنبله‌دهی نسبت به شاهد (بدون مصرف نیتروژن) به نسبت 8/10% افزایش داشت. هر چند میزان بذر اثر معنی‌داری بر عملکرد دانه نداشت اما بیشترین و کمترین تعداد سنبله در واحد سطح به ترتیب با میزان 300 و200 کیلوگرم بذر در هکتار (با اختلاف 09/132سنبله) به دست آمد. تفاصيل المقالة