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Abstract Current study was carried out by the aim of investigating the effect of different degrees of irrigation on some quantitative characteristics of eastern cottonwood (Populus deltoides Bartr. ex Marsh) seedlings in Guilan province.... more
Abstract
Current study was carried out by the aim of investigating the effect of different degrees of irrigation on some quantitative characteristics of eastern cottonwood (Populus deltoides Bartr. ex Marsh) seedlings in Guilan province. The cuttings were planted in a completely randomized design with four treatments and five replications. Three irrigation levels including 20%, 40% and 60% of soil saturated moisture content in each pot including 187.5, 375 and 570 ml water for 2.5 kg soil and control treatment (without manual irrigation) every three days applied on seedlings form the beginning of spring to end of summer. At the end of the period, height of seedlings using ruler, collar diameter using caliper, stem and root fresh weight by scale, stem and root biomass by drying in oven, root length using graph paper, the number of leaves by counting were measured for all treatments and examined by one-way analysis of variance (ANOVA) test. The results showed that the highest mean of seedlings height (with 89 cm), maximum mean of collar diameter (with 8.28 mm), highest mean of stem fresh weight (with 37 g), highest mean of root length (462 80 cm), the highest mean of leaf number (with 10.23) was related to 60% treatment. The highest mean of root fresh weight and the highest stem and root biomass were observed at 40% with 4.26, 14.05 and 1.62 grams, respectively. The optimum amount of poplar seedlings irrigation was also determined by 40%.
Abstract Due to importance of sugar beet in food industry in Iran, it is necessary to study the reply of the crop to different irrigation water. Since applying farm studies need time and costs, it is important to use cropping model. To... more
Abstract
Due to importance of sugar beet in food industry in Iran, it is necessary to study the reply of the crop to different irrigation water. Since applying farm studies need time and costs, it is important to use cropping model. To achieve the aim, AquaCrop and CropSyst models were evaluated for simulation of sugar beet yield under different irrigation scenarios. To do this end, data collected from Feiz Abad agricultural research station in Qazvin from four irrigation periods (I1: 6, I2: 9, I3: 12 and I4: 1 day) were used. Results showed that AquaCrop accuracy was better than CropSyst. In average, AquaCrop and CropSyst error for simulation of sugarbeet yield were 1.7 ton.ha-1 and 4.2 kg.ha-1, respectively. Results for water use efficiency showed the superiority of AquaCrop. Efficiencies of both crop models for yield and water use efficiency were acceptable. AquaCrop and Cropsyst error for simulation of water use efficiency were 0.21 kg.m-3 and 0.50 kg.m-3, respectively. Comparison of R2 for both models revealed that AquaCrop results had better correlation with observed data compared to CropSyst ones. According to all results, it is proposed to use AquaCrop for simulation of sugarbeet.
There is a strong need to develop Landscape in and around cities to prevent air pollution and create a suitable environment. This will create a new place of consumption for water. Therefore, it is necessary to estimate the... more
There is a strong need to develop Landscape in and around cities to prevent air pollution and create a suitable environment. This will create a new place of consumption for water. Therefore, it is necessary to estimate the evapotranspiration of urban Landscape plants to manage water use. In this study, vegetative coefficient and water requirement of Calendula officinalis plant were estimated using Wucols method and water balance method for the period of six months from 21 March 2019 to 22 September 2019 in the Botanical Garden of Campus of Agriculture and Natural Resources, University of Tehran. In this period, the average coefficient of vegetation for the whole period was 0.38 and 0.3, respectively, by the water balance method and the Wucols method. Evapotranspiration was estimated as an average of 776 mm in the water balance method and 607 mm in the Wucols method throughout the experiment. In the urban Landscape the vitality, health and decorative aspects of plants are important.
By using the Wucols method to determine the water requirement, it is possible to prevent over-irrigation or under-irrigation by correctly estimating the water requirement of the plants and applying the appropriate depth of irrigation water. And provided sufficient plants growth.