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Ebrahimian Hamed Dialameh Babak Hosseini-Moghari Seyed-Mohammad Ebrahimian Amirhossein 《Paddy and Water Environment》2020,18(3):499-514
Paddy and Water Environment - Aqua-agriculture reservoirs have been used as one of the main resources for supplying water to paddy fields, particularly under water shortage conditions. In this... 相似文献
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Ebadi Arash Raja Omid Ebrahimian Hamed Yazdani Mohammad Reza Rezaverdinejad Vahid 《Paddy and Water Environment》2022,20(1):137-150
Paddy and Water Environment - One of the common irrigation systems in the paddy fields is field-to-field irrigation. The management of these irrigation systems is difficult and essential because of... 相似文献
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Elnaz Ebrahimian Ahmad Bybordi Seyyed Mohammad Seyyedi 《Communications in Soil Science and Plant Analysis》2017,48(3):345-355
In order to investigate the effects of nitrogen (N) and zinc (Zn) fertilizers on seed yield, oil percentage, glucosinolate content, and nutrient uptake of canola (Brassica napus L. cv. Okapi), irrigated with saline and ultra-saline water, field experiments were conducted in Agriculture Research Centre of East Azarbaijan, Iran, during three consecutive years: 2011, 2012, and 2013. The experiments were carried out based on randomized complete block design arranged in factorial with three replications. The experimental treatments included N rates at three levels (0, 50, and 100 kg ha?1), Zn rates at three levels (0, 5, and 10 kg ha?1), and saline water at two levels (8 and 16 dS m?1 as saline and ultra-saline water). According to the results, N and Zn application had a significant effect on the plant height, pod number per plant, and seed yield. However, the value of these traits decreased as a result of the higher salinity level (from 8 to 16 dS m?1). From the results, the glucosinolate content was not affected by N or Zn fertilization, whereas, salinity increased the glucosinolate content from 27.51% to 30.06% when saline water and ultra-saline water were applied, respectively. In addition, the effect of ultra-saline water on the decrease in the N, phosphorous, potassium, and calcium uptake and the increase in the sodium and chlorine accumulation in canola seed was significant. However, Zn application could diminish adverse effects of salinity on phosphorus uptake. For instance, under ultra-saline water conditions, application of 10 kg ha?1 Zn increased the seed phosphorus content compared with control treatment. In general, it seems that nutrients’ supply, especially N and Zn, can be considered as an effective solution to diminish adverse effects of salinity. 相似文献
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Hossein T. Jalali Zahra J. Ebrahimian Dmitry V. Evtuguin Carlos Pascoal Neto 《Industrial Crops and Products》2011,33(2):549-553
The chemical composition of oleo-gum-resin from Ferula gummosa collected in the northern part of Iran has been studied. The fraction of oleo-gum-resin soluble in ethanol (ca 67 wt.%) is composed by three major fractions: (i) monoterpenes and monoterpenoids (ca 15 wt.% fraction), (ii) sesquiterpenes and sesquiterpenoids (ca 30 wt.%) and (iii) triterpenes and triterpenoids (ca 55 wt.%). The major families of terpenes and terpenoids were identified employing gas chromatography coupled with mass spectrometry detector (GC-MS). Almost 25 wt.% of oleo-gum-resin was insoluble in ethanol and, according to wet chemistry analyses, assigned to arabinogalactane structurally associated with protein complex (AGP). This arabinogalactan possessed the molecular weight of ca 30 kDa, as revealed by size exclusion chromatography, and the main backbone was constituted by β-(1 → 3)/β-(1 → 3,6)-linked d-galactopyranosyl residues ramified predominantly by terminal α-l-arabinofuranosyl and β-d-glucuronopyranosyl residues, as assessed by 1D/2D 1H NMR. 相似文献
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Eurasian Soil Science - Inverse modeling is a relatively complex procedure that allows quick estimation of soil hydraulic properties, yielding parameters for both soil water retention and... 相似文献
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Evaluation of various quick methods for estimating furrow and border infiltration parameters 总被引：2，自引：2，他引：0
Hamed Ebrahimian Abdolmajid Liaghat Behzad Ghanbarian-Alavijeh Fariborz Abbasi 《Irrigation Science》2010,28(6):479-488
For estimating infiltration properties of surface irrigation, some ‘quick’ and easy methods have been developed. The main
objective of this study was to evaluate different ‘quick’ methods and to compare the obtained results with two new methods
proposed based on the Shepard one-point approach. For this purpose, data sets measured in six borders and five furrows were
used for evaluating different methods. Using the volume balance equation and estimated infiltration parameters, the total
infiltrated volume and advance times were predicted to evaluate the accuracy of estimated infiltration parameters. The results
showed that the modified Mailapalli and Elliott and Walker methods provided the lowest errors for both furrow and border irrigations.
The Elliott and Walker method predicted advance times with highest accuracy. There was very small difference between the Shepard
and new proposed one-point methods. The performance of the Elliott and Walker method was slightly better than the new proposed
two-point method for the experimental furrows, while a minor difference was found for the experimental borders. The results
also showed that the performance of the Elliot and Walker method would be improved using binomial approximation instead of
Kiefer approximation. 相似文献
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Ebadi Arash Raja Omid Ebrahimian Hamed Yazdani Mohammad Reza Rezaverdinejad Vahid 《Paddy and Water Environment》2022,20(1):151-151
Paddy and Water Environment - 相似文献
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Seyyed Mohammad Seyyedi Elnaz Ebrahimian Esmaeil Rezaei-Chiyaneh 《Communications in Soil Science and Plant Analysis》2018,49(5):585-603
Higher planting densities increase flower yield of saffron during the initial years; however, increase in population may have a negative effect on daughter corms, through increasing competition for nutrients. Accordingly, lower densities result in more desirable daughter corms for future planting. To investigate the effect of planting density, vermicompost and mineral fertilizers on daughter corms formation, and nitrogen (N) and phosphorus (P) content in the corms during different phenological stages, a three-year field experiment was conducted as factorial-split layout based on randomized complete block design with three replications, at Faculty of Agriculture, Ferdowsi University of Mashhad, Iran. The experiment consisted of 12 main plots [planting density (30, 60, 90 and 120 corms m?2) × fertilizer sources (vermicompost 10.2 t ha?1, mineral fertilizer including N 225 kg ha?1 + P 129.08 kg ha?1 and control)] and 15 subplots (15 sampling rounds; during the first, second and third growing seasons). During all stages of sampling, N and P content in large-sized daughter corms was significantly higher compared with middle and large-sized daughter corms. Application of vermicompost significantly increased the number, weight, N and P contents of medium and large daughter corms per plant than mineral fertilizer. Increase in plating density caused a significant reduction in number, weight, N and P content in the medium and large sized daughter corms per plant. Overall, the results suggest that lower densities and vermicompost application should be scheduled in mother corms production programs. 相似文献
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Simulation of 1D surface and 2D subsurface water flow and nitrate transport in alternate and conventional furrow fertigation 总被引：3，自引：0，他引：3
Hamed Ebrahimian Abdolmajid Liaghat Masoud Parsinejad Enrique Playán Fariborz Abbasi Maryam Navabian 《Irrigation Science》2013,31(3):301-316
Increasing water and fertilizer productivity stands as a relevant challenge for sustainable agriculture. Alternate furrow irrigation and surface fertigation have long been identified as water and fertilizer conserving techniques in agricultural lands. The objective of this study was to simulate water flow and fertilizer transport in the soil surface and in the soil profile for variable and fixed alternate furrow fertigation and for conventional furrow fertigation. An experimental data set was used to calibrate and validate two simulation models: a 1D surface fertigation model and the 2D subsurface water and solute transfer model HYDRUS-2D. Both models were combined to simulate the fertigation process in furrow irrigation. The surface fertigation model could successfully simulate runoff discharge and nitrate concentration for all irrigation treatments. Six soil hydraulic and solute transport parameters were inversely estimated using the Levenberg–Marquardt optimization technique. The outcome of this process calibrated HYDRUS-2D to the observed field data. HYDRUS-2D was run in validation mode, simulating water content and nitrate concentration in the soil profiles of the wet furrows, ridges and dry furrows at the upstream, middle and downstream parts of the experimental field. This model produced adequate agreement between measured and predicted soil water content and nitrate concentration. The combined model stands as a valuable tool to better design and manage fertigation in alternate and conventional furrow irrigation. 相似文献
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All of steady and non-steady subsurface drainage equations were developed mostly based on water flow pattern in an ordinary field conditions. However, subsurface drainage in a paddy field is quite different from subsurface drainage in an ordinary field. Thus, it is necessary to develop new equations and mathematical models to design subsurface drainage system in a paddy field. The objective of this study was to apply the HYDRUS-2D model, based on the Richard’s equation, to simulate water flow under subsurface drainage in a paddy field for various drain depths (0.5, 0.75 and 1.0 m) and spacings (7.5 and 15.0 m), surface soil textures (clay loam and silty clay loam) and crack conditions. Simulation results were compared with two well-known drainage equations. The maximum drainage rate was obtained under 7.5-m spacings and 1-m depth. With increasing drain spacings, the drainage rate decreased. Drain spacings had more effect on drainage rate and water pressure head as compared to drain depth. Drainage rates calculated by the Hooghoudt’s and Murashima and Ogino’s equations were much lower than those calculated by the Richard’s equation. The Hooghoudt’s equation, developed for ordinary fields, did not perform well for paddy fields. This study also proved the importance of cracks in subsurface drainage system of paddy fields. HYDRUS-2D stands as a robust tool for designing subsurface drainage in a paddy field. 相似文献
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