Intermittent fires in Northeast Iran the autumn of 2010 resulted burning some valuable forest habitats. The objective this study was to apply geographic information systems (GIS) determine what degree three key factors (environmental, climatic, and anthropogenic) influence severity rating these forests. fire sites were surveyed imported into GIS. burnt areas considered relation factors. Statistical functions used calculate effect at each site. Logistic stepwise regressions related factor....

A Geographical Information System (GIS)-based plan was used to assess the possibility and performance of a canola (Brassica napus L.) – soybean (Glycine max rotation in Golestan province, one most important agricultural production regions Iran. For this purpose, all needed raster layers, including climatic (precipitation, temperature), topographic (aspects slope) soil-related (texture, pH, EC) were provided by interpolation, surface analysis other related techniques GIS. Overlaid layers...

The aim of this study was to assess the effects crop management practices on diversity, structure, and composition weed communities. A total 30 fields (15 each) in low‐input conventional farming systems were surveyed north‐eastern Iran. In cropping system, both mineral fertilizers herbicides applied, while fertilizer mainly manure avoided. results showed that pool species, species richness, number unique Shannon's diversity index greater system than system. Both had more broad‐leaved grasses...

Leaf area estimation is an important measurement for comparing plant growth in field and pot experiments. In this study, determination of the leaf (LA, cm2) soybean [Glycine max (L.) Merr] involves measurements parameters such as maximum terminal leaflet length (L, cm), width (W, product (LW), green dry matter (GLDM) total number leaflets per (TNLP) independent variables. A two-year study was carried out during 2009 (three cultivars) 2010 (four under conditions to build a model LA across...

The effects of different kinds crop residues on cereal yield and nitrogen uptake have not been studied.A two-year (2008-2010) field experiment was aimed to study the effect four (cotton, alfalfa, wheat maize) with C:N ratios compare them pure urea a control treatment, soil N concentration (as nitrate+ammonia) total accumulation in leaves stem (cv.N8019, high N-demanding cultivar).For this purpose, immobilization avoided by adding as based their ratio index, which established at 90 Kg N.ha -1...

Organic farming suitability can improve the health of environment, agroecosystems and humans, quality products, local economy. agricultural system is not very much evolved in Iran. In this paper a model proposed to identify suitable zones 14 counties Golestan Province, northeast Iran, for development organic using spatial indicators, analysis Multi-Criteria Decision Analysis (MCDA). model, some important criteria such as climatic variables, topographic factors, soil characteristics,...

In order to determine the effect of temperature on germination response fennel seeds, in Petri-dishes, seeds 3 varieties (Hamedan, Malayer and Isfahan) were exposed 6 constant temperatures (10, 15, 20, 25, 30 35°C).Results indicated that had a significant maximum percentage, uniformity, rate, time 5, 10, 50, 90 95% germination, while insignificant variety interacted was observed.Among three non-linear regression models used assessment (segmented, dent-like beta), model found be...

A 2-year study was conducted to determine the response of four sunflower cultivars (Master, Lakumka, Favorite and Berezanski) different irrigation regimes: 45 (control), 60, 75 90% (I1–I4) maximum allowable depletion (MAD) available soil water (ASW). Severe deficit (I3 I4) significantly decreased water-use efficiency, radiation use yield yield-related components. The results also showed that deficit, compared full-irrigated treatment (I1), increased activity all antioxidant enzymes in...

A 2-year field experiment (2012–2013) was conducted to evaluate the yield and water use efficiency (WUE) response of maize (Zea mays L.) different soil managements at sowing dates. The included three dates (22 June, 6 July 21 July) four irrigation regimes based on maximum allowable depletion (MAD) total available (TAW). treatments were marked by I1 I3 as 40%, 60% 80% MAD TAW, respectively, with no irrigation. results showed that grain reduced when planting delayed in both years, ranging from...