Foxtail sophora is a widely distributed problematic weed in western Iranian dryland farming systems. Little information available on seed germination and seedling emergence of this species response to environmental agronomic factors. This study was conducted address knowledge gap. Maximum (80%) occurred at 25 C decreased lower temperatures (<1% 5 C) or under fluctuating temperature regimes. Light pH did not have any substantial effect germination. tolerant osmotic stress moderately sodium...

Abstract The enemy release hypothesis (ERH) of plant invasion asserts that natural enemies limit populations invasive plants more strongly in native ranges than non‐native ranges. Despite considerable empirical attention, few studies have directly tested this idea, especially with respect to generalist herbivores. This knowledge gap is important because escaping the effects generalists a critical aspect ERH may help explain successful invasions. Here, we used consumer exclosures and seed...

This study was conducted to evaluate effects of organic fertilizers on micronutrients status soil and yield sesame. Research performed in split-plot design based a randomized complete block with three replications. The experimental treatments included animal manure as main factor at levels (0, 10, 20 t ha−1) application green manures sub four (no manure, Berseem clover, Fenugreek, Vicia villosa). results showed by copper (Cu), zinc (Zn), manganese (Mn), ferrous (Fe) contents the treatment...

This study was conducted to predict the yield and biomass of lentil (Lens culinaris L.) affected by weeds using artificial neural network multiple regression models.Systematic sampling done at 184 points 8-leaf early-flowering maturity.The weed density height as well canopy cover were measured in first stage.In addition, species richness, diversity evenness calculated.The variables stage considered predictive variables.In second stage, dry weight recorded same stage.The dependent...

Biochemical components in alfalfa ( Medicago sativa L.), such as saponins, can act protecting factors against bio-stresses. Saponins are also antifeedants and show oral toxicity towards higher lower animals. Changes variation the carbon skeleton, or hydrolysis of saponin glycosides other conjugates, may change their biological effects. The aims this research were to study different growth stages investigate role saponins spotted aphid, Therioaphis maculata . from shoots extracted, chemically...

Centaurea iberica has become a problematic weed in some regions of western Iran. Little published data are available the literature regarding its seed germination and seedling emergence. Therefore, this study was conducted order to evaluate effects different factors on C. germination. The highest level achieved at fluctuating temperatures 15/25°C (night/day). stimulated by light little occurred under continuous darkness. pH solution did not have any effect tolerant both salt water stress....

Abstract To investigate the effects of agronomic practices and farmer demographics on levels weed infestation in chickpea fields, a survey was conducted during 2015 Sanjabi district, Kermanshah, Iran. Two sets data were collected: (a) sampling from selected (b) questionnaire recording management. The farmers asked about their residence status (resident or migrant), occupation (farming only, farming plus second job), experience education levels, as well seedbed preparation, sowing date...

This study determined the potential of tortoise beetle (Coleoptera: Chrysomelidae) to control Canada thistle (Asteraceae) in Iran. Genetic analysis beetle, based on mitochondrial DNA, confirmed presence species A field experiment using five insect densities (0 20 larvae plant −1 ) showed a positive correlation between number transferred and impact. Feeding by reduced total biomass 78% capitula 94%. More important, when grown competition with wheat, four eight egg batches (corresponding...

Abstract The current study was conducted in 2013 to identify the seeds of three species Amaranthus , viridis L., retroflexus L. and albus by using artificial neural network (ANN) canonical discriminant analysis (CDA) methods. To begin with, photographs were taken 13 morphological characteristics each seed extracted as predictor variables. Backward regression used find most influential variables seven derived. Thus, divided into two sets characteristics. results showed that recognition...

Study of Plant Species Richness in Habitats with Different Grazing Intensities at Golestan National Park and Surrounding Area

Understanding the physiological basis of absorption and transportation nitrogen by plants has specific importance. In this experiment, a bread cultivar durum wheat cultivar, were treated with different rates times application, using split factorial on randomized complete block design three replications at Shiraz region during 2004–2005. Main plots consisted two levels cultivars (Falat Yavaros) sub included (40, 80 160 kg ha−1) application (T1 = all N fertilizer planting, T2 1/2 planting+1/2...

Various parts of a seed have different responses to same culture condition, because dissimilar hormone concentration and enzyme activity. Indirect regeneration watermelon was tested with parts: hypocotyl, basal, central, distal peripheral zone (parts 1, 2, 3, 4 5, respectively). The were cultured in MS medium containing 3.5 mg/l BA 0.5 IAA. Photoperiod (16h light/8h dark) or dark condition used as light treatment. Every 2 weeks the callogenesis percentages number regenerated leaves assessed...

Scotch thistle ( Onopordum acanthium L.) is a weed species on farmlands and pastures in parts of the west northwest Iran. Cypselas can remain soil seedbank over prolonged period due to varying degrees dormancy. This study examined different methods for breaking cypsela dormancy two local populations at research laboratory Faculty Agriculture Azarbaijan Shahid Madani University 2020. In these experiments, effects sulfuric acid, wet dry prechilling, potassium nitrate, gibberellic acid were...

به‌منظور شبیه‌سازی اثرات تاریخ کاشت بر رشد و عملکرد نخود دیم منطقه کرمانشاه توسط مدل CROPGRO-CHICKPEA، آزمایشی به صورت کرت‌های خرد شده در قالب طرح پایه بلوک‌های کامل تصادفی با 3 تکرار مزرعه تحقیقاتی پردیس کشاورزی منابع طبیعی دانشگاه رازی سال زراعی 96-1395 اجرا شد. تیمارها شامل سه (10 اسفند، 20 اسفند 17 فروردین) به‌عنوان عامل اصلی چهار رقم (بیونیج، عادل، آرمان ILC482) فرعی بود. ضرایب ژنتیکی ارقام بخش محاسبه برای 10 نتایج واسنجی نشان داد قادر است حداقل اختلاف، ویژگی‌های نمو را کند که بیانگر...