جستجوی مقالات مرتبط با کلیدواژه « اسپد » در نشریات گروه « زیست شناسی »

In order to investigate the integration effect of organic and chemical fertilizer on vegetative and yield characteristics of sweet pepper (Caspsicum annuum, Var: Traviata), an experiment was conducted on a randomized complete block design with three replications at Ferdowsi University Research Station Mashhad in 2017. Treatments were included control (without adding any fertilizer), NPK fertilizer, animal, vermicompost, vermicompost+chemical, animal+chemical, animal+vermicompost and animal+vermicompost+chemical. The results showed that the application of combined animal and chemical fertilizers significantly increased the morphological and yield components of the plant. The highest plant height, leaf number, leaf area, shoot dry weight, spad index, Fruit length, number of fruits per plant and fruit fresh weight per plant were obtained from combined animal and chemical treatments. Used of combine animal and chemical fertilizer was increased amount of stomata conductance about 45% in compare of control. The highest number of cavities in fruit was obtained from vermicompost treatment and the highest fruit diameter was recorded from combined vermicompost in chemical fertilizer. In general, the results showed that the use combine of animal and chemical fertilizer due to the effect of improving physical and chemical structure of soil, stimulation of some microorganisms and availability of nutrients, lead to increase the morphological traits, yield components and yield of sweet pepper.

Drought stress is one of the most important and most common environmental stress that is limited agricultural production. to evaluate the effect of different levels of deficit irrigation on some properties of three varieties of petunia, a factorial experiment in a completely randomized design with four replicationswas conducted in research greenhouse of Ferdowsi University of Mashhad. Examined factors including drought in four levels (100, 80, 60 and 40% of field capacity) and three varieties of petunia (Supercascade, Tango blue and Tango white). Traits were included fresh weight of plant components, total dry weight, stem diameter, spad, antioxidant activity, leaf weight ratio (LWR), leaf area ratio (LAR), Relative Water Loss (RWL), Water Saturation Defficient (WSD) and Leaf Water Content per unit leaf Area (LWCA). The results showed that with increasing drought from control to severe stress (40% FC) Spad increased from 35.4 to 42.6. percentage of antioxidant activity in Tango White and Tango Blue was more than Supercascade. the most leaf fresh weight was in Tango White and in control stress levels (6.08 g) and 80% of field capacity (5.9 g) and the maximum stems fresh weight (9.7g/plant) and flower fresh weight (15.1 g/plant) were seen in Tango White varity and control stress. total dry weight was observed in Tango White and 100% FC. LWR value in Supercascad, Tango Blue and Tango White were 0.283, 0.538 and 0.496 respectively. WSD (72) and RWL (65%) in Supercascade varity and under severe stress (40% FC) with a significant effect was higher than other treatments. Generally the results showed Tango White and Tango Blue varities, in control and also under water stress conditions had more fresh weight, dry weight and antioxidant activity and had WSD and RWL less than Supercascad and so are more resistant.