جستجوی مقالات مرتبط با کلیدواژه « عناصر ریزمغذی » در نشریات گروه « علوم پایه »

Low irrigation is one of the ways to reduce water consumption in heat-loving and water-loving crops. On the other hand, the use of mycorrhiza as a biofertilizer is also one of the effective solutions in increasing the absorption of water and nutrients in the conditions of water shortage stress. In addition, the selection of varieties compatible with the region in order to achieve production potential is another way to deal with drought stress in each region. For this purpose, the effect of irrigation regime at three levels of 80 (control), 120 (mild stress) and 160 (severe stress) mm of evaporation from the evaporation pan of class A and biofertilizer including application and non-application of mycorrhiza on three grain sorghum cultivars Kimia, Payam and Sepideh It was investigated in the form of randomized complete block design in the form of a split plot in the summer cultivation of 2016 in Kohdasht city of Lorestan. The results showed that the amount of zinc, copper, manganese and iron in the seeds decreased with the increase in water shortage, but the crude protein content of the seeds increased. The application of mycorrhiza mainly increased the essential elements in shoots and seeds and helped to moderate water deficit stress. The presence of interaction between the factors indicated the different response of cultivars at the levels of mycorrhizal application to water deficit stress in terms of many traits; so, in the conditions of extreme stress of water shortage, the highest increase in catalase and peroxidase observed in Kimia cultivar without mycorrhiza application and Sepideh cultivar with mycorrhiza application, respectively. Also, Sepideh variety with mycorrhiza application showed the highest reduction in chlorophyll b and total chlorophyll. In total, Sepideh cultivar with the use of mycorrhiza under the conditions of mild stress of water shortage while producing the highest grain yield and crude grain protein, saved irrigation water consumption.

In order to study the effects of mycorrhizae and foliar application of nano Fe and Zn oxides on nodulation and quantitative and qualitative yield of lentil under rain fed conditions, a factorial experiment was conducted based on randomized complete block design with three replications in a farm at Zardalo village, Ardabil province during 2017-2018. Treatments included foliar application of nano Fe and Zn oxides at four levels (foliar application with water as control, foliar application of nano iron oxide (0.6 gL-1), nano zinc oxide (0.6 gL-1), combined foliar application of nano Fe and Zn oxides (0.3 g L-1 each), and application of mycorrhiza at four levels (no application of mycorrhiza as control, application of Mycorrhizae mosseae, Mycorrhiza intraradices, and combined application of Mycorrhiza intraradices with mycorrhiza mosseae). Means comparison showed that foliar application of nano Fe-Zn oxides as well as combined application of mycorrhizal mosseae and intraradices increased number of active nodules per plant, percentage of active nodules per plant, 100 grain weight, and grain yield by 173.2, 93.08, 36.58, and 58.34% respectively in comparison with no foliar application of nano Fe-Zn oxide and no application of mycorrhiza. Also, combined foliar application of nano Fe-Zn oxide along with mycorrhiza mosseae and intraradices increased respectively the number of grains per pod, number of pods per plant, dry weight of root, zinc content of grains, and protein contentof grains increased by 42.14, 95.17, 12o, 58.2, and 47.55%, respectively in comparison with no application of mycorrhiza and nano Fe-Zn oxide. It seems that foliar application of nano Fe-Zn oxide and mycorrhiza application owing to improving some morphophysiological traits can be considered as a proper method for increasing quantitative and qualitative yield and mitigating the effects of water deficit in rain fed conditions.

In order to investigate the effect of mycorrhiza fungi on nutrient uptake of barley in rain fed conditions, a field experiment was carried out in factorial analysis based on randomized complete block design with three replications at the farm station of Sarablah Agricultural Research Center, Ilam during 2019-2020 cropping season. Experimental factors were four barley cultivars (Mahali, Mahoor, Khoram, and Fardan) and fertilizer application including: control (without fertilizer application and mycorrhizal fungi), 50% P chemical fertilizer recommended based on soil test (25 keg/ha), mycorrhizal fungi (Glomus mosseae, Glomus etunicatum, and Rhizophagus irregularis), mycorrhizal fungi along with 50% P chemical fertilizer, and 100% P chemical fertilizer as recommended. Results indicated that interaction between cultivar and fertilizer sources had significant effect on nitrogen, phosphorus, potassium, magnesium, iron, copper, and manganese. Interaction of Fardan cultivar and mycorrhizal fungi + 50% phosphorus fertilizer resulted in the highest nitrogen (11.1%), phosphorus (1.19%), potassium (3.92%), magnesium (0.292%), iron (136.5 mg.kg-1) manganese (65.8 mg.kg-1), and copper (65.71 mg.kg-1) in leaves. According to the obtained results, in the rain fed conditions, the new cultivar Fardan is recommended with mycorrhizal fungi along with 50% phosphorus fertilizer given the high concentration of high macro elements (nitrogen, phosphorus, potassium and magnesium) and micro elements (iron, manganese, and copper) and the role of these elements in plant growth and photosynthesis

The aim of this study was to investigate the effects of climate, irrigation regimes and micronutrients foliar application on morphophysiological characters of three medicinal species of Satureja. This research was carried out in a completely randomized design with in factorial layout and 4 replications. Factors were 2 climatic regiones (Isfahan and Golpayegan), 3 species (mutica, bachtiarica and khuzistanica), 3 concentrations of Cu (0, 20, 40 ppm) and Mn (0, 20 and 40 ppm). The results of study showed that among the morphological traits, the highest plant height (57.5±1.1cm), stem number (22.2±1.7) and total chlorophyll (1.57±1.1 mg.l-1) in species of khuzistanica under Isfahan region made by concentration of 20 ppm of Cu and Mn with irrigation period every 3 days and the greatest amount of Proline (13.99±0.1 mcg.grfw-1) obtained in species of khuzistanica under Isfahan region made by concentration of 40 ppm of Cu and Mn with irrigation period every 9 days .  The lowest amounts of characters almost mad by species of mutica under Isfahan region by concentration of 40 ppm of Cu and Mn with irrigation period every 9 days. It seems, better condition in Isfahan region by subtropical climate for species of khuzistanica made the most morpho-physiological characters with irrigation period every 3 days.

To investigate the influence of humic acid on the amount of absorption and allocation of elements on different parts of Satureja khuzestanica under salinity stress conditions, a greenhouse experiment was done as factorial based on a randomized complete block design in four replications. Factors included humic acid (zero, 10, 20, 30 and 40 mg kg-1 soil), and salinity stress (zero, 25, 50, 75 and 100 mM NaCl). It was found that the shoot dry weight was decreased with increasing the intensity of salinity stress; at a level of 100 mM sodium chloride, the average of this trait was reduced by 16%. In contrast, the use of humic acid, particularly 60 mg/kg soil, increased the shoot dry weight by 25% compared to the control. The effect of humic acid, salinity, and their interaction were significant (P≤0.01) on measured characteristics except stem and leaf nitrogen. Results showed that among organs (root, stem and leaf), the highest amount of sodium, potassium, phosphorus, zinc and nitrogen (5064, 9000, 13, 19.92 and 3.91 mg kg-1 dry weight) were observed in leaf in the S1H5, S2H2, S1H4, and S1H5 treatments, respectively. Among different organs, maximum iron content (759.9 mg kg-1 of dry weight) was observed in roots under S2H1. In general, with increasing salinity and decreasing humic acid, the concentration of salts such as sodium increased whereas the concentration of useful and essential elements for the plant decreased. According to the results, it can be stated that probably soil application of humic acid at high amounts (40 and 60 mg/kg soil) can moderate the effects of salinity stress by affecting the nutrient changes of plant organs.