7
Elyas Ostadi; abbas Khasheisiuki; amir salari
Abstract
The necessity of increasing economical productivity of agriculture and the increasing global demand for medicinal plants and considering the low water requirement of these plants have shifted the cropping pattern to their benefit. Water needs of Nigella sativa L., an important medicinal plant, was not ...
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The necessity of increasing economical productivity of agriculture and the increasing global demand for medicinal plants and considering the low water requirement of these plants have shifted the cropping pattern to their benefit. Water needs of Nigella sativa L., an important medicinal plant, was not known, therefore, we aimed to determine its water needs. (ETc) and crop coefficients (Kc) for different phenological stages in arid conditions of Birjand, in 2018. In order to conduct the research, three weighing lysimeters (with a diameter of 20 cm and a height of 16 cm) were used in three replications. Actual daily evapotranspiration was estimated by water balance in lysimeters and reference evapotranspiration was calculated based on 12 cm grass. The results showed that, in the initial stage, the rate of evapotranspiration was low, in the developmental stage it had an increasing trend, and after stabilization in the middle stage, with the onset of aging in the maturity stage of growth, the rate of evapotranspiration decreased. Actual and reference crop evapotranspiration was obtained as 670 mm and 1439 mm, respectively. The values of crop coefficients in the initial, development, middle, and final stages were obtained as 0.39, 0.53, 0.59, and 0.28, respectively. The general conclusion of the research is that by using the values of crop coefficients and water requirement, it is possible to cultivate this crop with maximum water productivity in the arid region of Birjand.
7
Yaser Hoseini
Abstract
Cucumber is one of the important greenhouse vegetables in Iran and the world. Cucumber is a warm and temperate season crop and is very sensitive to soil moisture regimes conditions. In order to model the effect of mixing soil with sawdust on the yield of greenhouse cucumber under different moisture regimes, ...
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Cucumber is one of the important greenhouse vegetables in Iran and the world. Cucumber is a warm and temperate season crop and is very sensitive to soil moisture regimes conditions. In order to model the effect of mixing soil with sawdust on the yield of greenhouse cucumber under different moisture regimes, an experiment was conducted in a completely randomized block design with three replications. Treatments included sawdust-free treatment (control) and a combination of 5%, 10%, 20%, and 40% sawdust and amount of water were considered at two levels of 45% and 65% of field capacity and a stress-free level. Using response surface method, the results showed that, based on the variables of sawdust percentage and moisture level, the best yield model is the second degree model with a regression coefficient of 0.85. Also, the effect of available moisture levels on yield was linear and, in contrast, the effect of sawdust percentage on yield was a quadratic function. Also, assuming the least available moisture and the lowest percentage of sawdust mixing (i.e. 13.7% of sawdust and 43.6% of field capacity), the highest yield was 86.6 tons/ha with a degree of desirability of 0.6. Also, assuming the least available moisture and change of sawdust between zero to 40 % (27.6% of sawdust and 47% of field capacity), the highest yield was 93.6 tons/ha, with a degree of desirability of 0.8. The results showed that, in any specific moisture regime, with increase in the amount of sawdust, root indices, except the main root length, had an increasing trend with decrease in available water. Besides, in each of the moisture regimes treatments, an increasing trend of yield was observed with increase in the amount of sawdust. Considering the nonlinear effect of changes in moisture regime and sawdust mixing rate on greenhouse cucumber yield, in order to achieve the best yield, sawdust mixing ratio should be determined for each soil.
7
reza saeidi
Abstract
Determining the intra-seasonal sensitivity of maize evapotranspiration to environmental stresses has an important effect on modeling of yield. In this research, the effect of drought and salinity stresses were investigated on the relative evapotranspiration (during initial, development, mid, and late ...
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Determining the intra-seasonal sensitivity of maize evapotranspiration to environmental stresses has an important effect on modeling of yield. In this research, the effect of drought and salinity stresses were investigated on the relative evapotranspiration (during initial, development, mid, and late stages) and relative yield of maize, in a field with sandy loam soil texture. Salinity treatments were applied by water with EC of 0.5(S0), 2.1(S1), 3.5(S2), and 5.7(S3) dS.m-1. Drought treatments included four irrigation levels of 100% (I0), 80% (I1), 60% (I2), and 40% (I3) of the crop water requirement. The experiment was performed as factorial in a randomized complete block design, with three replications. The relative evapotranspiration of maize in the initial, development, middle and final stages was estimated between 63.5-100%, 62.6-100%, 55.2-100%, and 66.4-100%, respectively. The relative yield of maize in the I0S0 to I3S3 treatments was calculated between 42.6-100%. The results showed that salinity and drought stresses reduced both the evapotranspiration and maize yield. Also, evapotranspiration decreased with a steeper slope in sensitive growth stages compared to yield. Effect of the mentioned stresses at sensitive growth stages caused disruption in the flowering and fruiting of maize. In this study, the relative yield of maize was modeled by additive models of Blank, Stuart, Singh and multipliable models of Jensen, Rao, and Minhas. According to the results, Stewart model with sensitivity coefficients (in four growth stages) of 0.227, 0.416, 0.604, 0.14 and Jensen model with sensitivity coefficients of 0.301, 0.41, 0.608, and 0.147 were selected as the optimal models. However, Rao, Blank, Singh, and Minhas models were chosen as the next priorities. Therefore, under salinity and drought stress, the relative yield of maize was modeled based on the amount of evapotranspiration in the growth stages.
7
Ali Abdzad Gohari
Abstract
Knowing the appropriate cultivars and proper irrigation management is one of the most important factors affecting the growth and yield of peanut plant. The present study was conducted as split split plots in the form of a randomized complete block design with three replications, in 2018 and 2019 ...
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Knowing the appropriate cultivars and proper irrigation management is one of the most important factors affecting the growth and yield of peanut plant. The present study was conducted as split split plots in the form of a randomized complete block design with three replications, in 2018 and 2019 in Guilan Province. The main plot consisted of two methods of drip and furrow irrigation, and the sub-plots included supplying 125%, 100%, 75%, 50%, and 25% of water requirement, and the sub-sub-plot included two peanut cultivars Guil and Jonobi. The results of the study showed significant effect of irrigation method on seed yield (at p<0.5) and the effect of water supply on all measured traits (at p<0.1). The highest seed yield in 2018 and 2019 was observed in Guil cultivar with 100% water requirement of the plant with an average of 3221 and 3161 kg.ha-1, respectively. In the two study years, annual averages of seed yields in drip irrigation (1808 and 1803 kg/ha) compared to the furrow method (1753 and 1754 kg/ha) showed an increase of 3.1% and 2.8%, respectively. The correlation between traits, showed a positive and significant effect between seed yield and number of pods per plant, number of seeds per plant, and 100-seed weight. Based on the results, for peanut cultivation in the study area, Guil cultivar with drip irrigation and providing 100% of water requirement (5481 m3 of water/ha in this research) is recommended.
7
Mohammad Ali Gholami Sefidkouhi; Zahra Bagheri Khalili; Mohammad-Amin GhaleNovi
Abstract
Measuring the actual evapotranspiration rate of rice is too much important, in terms of appropriate and optimal water management of the Northern provinces in Iran. The present study aims to measure the actual evapotranspiration rate for two Shiroudi & Hashemi cultivars of rice, in Sari Agricultural ...
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Measuring the actual evapotranspiration rate of rice is too much important, in terms of appropriate and optimal water management of the Northern provinces in Iran. The present study aims to measure the actual evapotranspiration rate for two Shiroudi & Hashemi cultivars of rice, in Sari Agricultural and Natural Resources University’s paddy fields. For this propose, six drainage lysimeters were designed and constructed. After cultivating rice inside the designed lysimeters, the amount of precipitation, water content and deep percolation, were measured during 5-days periods. Investigation of the lysimeter results, shows difference between water requirement and also deep percolation of the two studied cultivars, in growth period (seeding to harvest steps); so that in these phases, water requirement rates was 350.81 & 396.67 millimeters and the deep percolation was 47.81 & 97.11, for the cultivars Shiroudi and Hashemi, respectively. Also the crop coefficient was obtained from the adaption of the lysimeter’s actual evapotranspiration and 14 indirect methods of reference evapotranspiration estimation, for the both cultivars. Considering the cultivar and estimating method, the crop coefficients are reported as the ranges 0.73-1.12 for the initial stage, 0.83-1.41 for the middle stage and 0.64-1.15 for the final stage. Also, the average estimation Error Percentage (PE) of the resulted crop coefficients compared to the recommended coefficients of FAO-Penmann56 method, is 11, 11 & 8 for Hashemi cultivar and 15, 23 & 16 for Shiroudi cultivar, in initial, middle and final stages respectively; which shows the necessity of extracting crop coefficients, for different cultivars under different local conditions. The obtained coefficients of the current study can be useful to calculate the water requirements of Hashemi and Shiroudi cultivars based on indirect estimation methods, for designing water projects, water delivery planning and also the irrigation and drainage networks in the research area.
7
fatemeh keykhaei; ghasem zareai; Naser Ganji Khorramdel; sadegh sadeghi
Abstract
One of the strategies to reduce water losses in agriculture is proper irrigation scheduling, which is based on accurate estimation of crop water requirement. In order to determine the evapotranspiration rate of three rose varieties, a one-year study was conducted in a hydroponic greenhouse equipped with ...
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One of the strategies to reduce water losses in agriculture is proper irrigation scheduling, which is based on accurate estimation of crop water requirement. In order to determine the evapotranspiration rate of three rose varieties, a one-year study was conducted in a hydroponic greenhouse equipped with drip irrigation system in Arak Plain using drainage type lysimeters. Reference evapotranspiration was also determined using a drained micro-lysimeter with grass. The results showed that the total amount of reference evapotranspiration in the greenhouse was 1608 mm. Also, the total evapotranspiration value of Utopia rose during this growth period was 1423 mm, Dolcevita rose 1480 mm and White rose 1313 mm. The annual average of daily evapotranspiration of rose varieties was 3.8 mm/day. Due to rose bushes being perennial, the crop coefficients did not have four growth stages and, therefore, the average coefficients varied between 0.7 and 0.96 in 10-day intervals. The results also indicated that the average crop coefficient of rose varieties was 0.81 over a year and the average amount of applied irrigation water was 20573 m3.ha-1.year-1 for approximately 75000 rose plant /ha.
7
saeid ghavamsaeidi noghabi; ali shahidi; Hossin Homami
Abstract
Determination of crop water requirement is of great importance in irrigation planning and effective management of water in agriculture. In this regard, lysimeters are used to measure water input and output and water balance method. Therefore, this research was carried out to determine the water requirement ...
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Determination of crop water requirement is of great importance in irrigation planning and effective management of water in agriculture. In this regard, lysimeters are used to measure water input and output and water balance method. Therefore, this research was carried out to determine the water requirement of Cannabis sativa L. in 2017 at the Faculty of Agriculture of Birjand University. For this purpose, six weighing lysimeters were used and cannabis water requirement was calculated using the water balance equation. Three lysimeters were planted to grass (12 cm height) as the reference crop, and in the other three lysimeters the cannabis plant was cultivated. Based on the results of the water balance equation, the evapotranspiration potentials of the reference plant and cannabis were 899.6 and 688.89 mm, respectively. The length of different stages of plant growth, including the initial, development, middle and end stages, was 30, 55, 75, and 20 days, respectively. Also, the cannabis crop coefficient values in the four stages of plant growth were 0.28, 0.68, 1.01 and 0.54, respectively. These values are recommended for estimating the water requirement and irrigation management of cannabis.
7
Akbar Mohammadi; Mohammad Hossain NajafiMood; abbas khashei; Ali Shahidi
Abstract
Crop coefficient is one of the most important factors in irrigation planning and optimal allocation of water resources to plants. The crop coefficient is obtained through the ratio of actual evapotranspiration to reference crop evapotranspiration. In this research, in order to determine the crop coefficients ...
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Crop coefficient is one of the most important factors in irrigation planning and optimal allocation of water resources to plants. The crop coefficient is obtained through the ratio of actual evapotranspiration to reference crop evapotranspiration. In this research, in order to determine the crop coefficients of Narcissus flower, which is an important ornamental plant, an experiment was conducted during 2018 growing season using lysimeters, in Birjand. Three lysimeter was used in this project and water requirement of Narcissus flower was calculated by water balance method. Turf grass with a height of 12 cm was used to determine reference crop evapotranspiration. The base crop coefficients were obtained as 0.42, 0.85, 0.86, and 0.74, and the coefficients of the soil surface evaporation were 0.49, 0.28, 0.25 and 0.22 at, respectively, primary, developmental, middle, and end stages. Finally, the values of Narcissus flower’s crop coefficients at different stages of growth including primary, developmental, middle, and end stages were calculated as 0.91, 1.13, 1.11, and 0.96. The estimation of water requirement and irrigation management of Narcissus flower will be possible using the obtained Kc values.
7
Ebrahim Sharifi Ashoorabadi; Hassan Rouhi pour; Maryam Jebeli; Maryam Mackizadeh Tafti; Behrooz Nadery
Abstract
To determine crop coefficient and evapotranspiration of Thymus daenensis Celak., an experiment was performed in 2016 using lysimeters (direct method) and computational method In the direct method, drainage lysimeters with underground structures located at Alborz Research Station in Karaj were used. Each ...
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To determine crop coefficient and evapotranspiration of Thymus daenensis Celak., an experiment was performed in 2016 using lysimeters (direct method) and computational method In the direct method, drainage lysimeters with underground structures located at Alborz Research Station in Karaj were used. Each of the lysimeters were 0.9 meters in diameter and 1.28 meters high. In each lysimeter, a seedling of Thymus was planted. Then, two main lysimeters were selected and their irrigation was adjusted to the field capacity. On both sides of the main lysimeters, similar lysimeters were considered as margins. During the experiment period, the input and output water of the lysimeters as well as dry weight of aerial parts, the amount of evapotranspiration, and water use efficiency in Thymus daenensis were measured. In order to estimate the evapotranspiration of the reference plant, the computational methods of Blaney Criddle and FAO Penman-Monteith were used. Thymus plant coefficients during plant growth, was obtained as the ratio of Thymus evapotranspiration to reference plant evapotranspiration. Based on the results, the amount of cumulative evapotranspiration of the reference plant by Blaney Criddle-FAO and Penman-Monteith-FAO were 715 and 631 mm, respectively. In lysimeters, Thymus evapotranspiration up to the beginning of flowering was 100 mm, to the beginning of seed production 455 mm, and to the end of seed production 622.13 mm. The Thymus plant coefficients in initial, crop development, mid-season and late-season stages were 0.33, 0.65, 1.20, and 0.99, respectively. Water use efficiency was estimated to be 0.4 gL-1. By determining the plant coefficient and water requirement of Thymus, in addition to helping in design of intelligent systems and mechanized irrigation, it will be possible to plan and manage irrigation during the plant growth period.
7
Hossein Beyrami; Mohammad Hassan Rahimian; Farhad Dehghany
Abstract
Water and soil resources of the country are limited, and the optimal use of water resources in agriculture requires estimation of the exact amount of water consumption by different plants in different conditions. This study was conducted to investigate evapotranspiration, crop coefficient, and water ...
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Water and soil resources of the country are limited, and the optimal use of water resources in agriculture requires estimation of the exact amount of water consumption by different plants in different conditions. This study was conducted to investigate evapotranspiration, crop coefficient, and water requirements of salicornia under lysimetric conditions in a factorial experiment with completely randomized design. The experimental treatments were two species of salicornia (Salicornia bigelovii and Salicornia persica) and two levels of irrigation water salinities (8 and 25 dS.m-1) in three replications. The actual evapotranspiration (ETa), reference evapotranspiration (ET0), and crop coefficients (Kc) of salicornia species were determined at three main salicornia growth stages. The results showed that increase in irrigation water salinity from 8 to 25 dS.m-1caused significant changes in yield (biomass and seed yield) of the two salicornia species at the 1-percent probability level. Moreover, the amount of irrigation water consumption in different treatments and replications varied from 28 to 33 thousand cubic meters per hectare. For the salinity level of 8 dS.m-1, the Kc values at the beginning, middle, and end of growing season of bigelovii specie were obtained as 1.18, 1.55, and 1.42, respectively, while for the salinity level of 25 dS.m-1, these values were 1.06, 1.37, and 1.26, respectively. For persica specie, the Kc values of the beginning, middle, and end of the growing season were 1.37, 1.58, and 1.10 (for salinity level of 8 dS.m-1) and 1.15, 1.38 and 1.27 (for salinity level of 25 dS.m-1), respectively. In addition, water use efficiencies of salicornia varied from 0.21 to 0.38 kg.m-3 at different treatments and species.
7
Saber Jamali; Hossein Ansari; Abbas Safarizadeh-sani
Abstract
Peppermint (Mentha piperita L.) is used for medicinal and food purposes. Its cultivation has economic importance, due to its ability to produce and store essential oil. This research was conducted to study the effect of deficit irrigation and magnetized water on yield and yield components of peppermint ...
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Peppermint (Mentha piperita L.) is used for medicinal and food purposes. Its cultivation has economic importance, due to its ability to produce and store essential oil. This research was conducted to study the effect of deficit irrigation and magnetized water on yield and yield components of peppermint in the experimental research greenhouse of Ferdowsi University of Mashhad, during 2018-19. We used a factorial experiment based on the completely randomized design with 3 replications. Irrigation levels consisted of 4 levels (100%, 85%, 70%, and 55% of plant water requirements) and magnetic field factors consisted of 3 levels (0, 0.3, and 0.6 teslas). The result showed that decrease of the water requirement by 15%, 30%, and 45% resulted in reduction of shoot fresh weights by 11.2%, 15.1%, and 36.5%, respectively. However, irrigation with magnetized water (0.3 teslas) under deficit irrigation levels (85%, 70%, and 55% of plant water requirements) resulted in the increase of shoot dry weights by 19.5%, 24.7%, and 66.4%, respectively. In general, the use of magnetic water under water stress enhanced plant growth and improved dry and wet shoot yield in peppermint compared to the control treatment under deficit irrigation conditions.
7
Mohammad Khaledi Alamdari; Abolfazl Majnooni Heris
Abstract
Annual and seasonal rainfall distributions are the main determinants of yield in rainfed conditions, of which seasonal rainfall is more important. Therefore, it is necessary to provide precipitation indicators that have a significant conceptual relation with crop performance fluctuations. ...
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Annual and seasonal rainfall distributions are the main determinants of yield in rainfed conditions, of which seasonal rainfall is more important. Therefore, it is necessary to provide precipitation indicators that have a significant conceptual relation with crop performance fluctuations. In the present study, the relation between rainfall uniformity indices and rainfed wheat yield in Tabriz plain was evaluated in 19-years period. Also, in order to examine the effect of precipitation more accurately, the Rain-Time Index [M1] [M2] (RTI) was used, which could indicate the effect of simultaneous changes of the two factors of rainfall time and rainfall amount on crop yield fluctuations. The results showed that the correlation between rainfed wheat yield and slope of uniformity line (ratio of cumulative precipitation per length of growing period) was significant at 1% level. However, there was no significant correlation between the uneven distribution index and yield. Also, according to the obtained results, the first effective rainfall event is the most effective rainfall event on the yield of rainfed wheat. It seems that the inadequacy of effective spring rainfall, which is one of the main reasons for the low yield of rainfed lands, prevented the explanation of the positive effect of late season rainfall on yield. Therefore, in order to evaluate the effect of intermittent precipitation and Rain-Time Index [M3] [M4] on yield more accurately, a single supplementary irrigation should be applied at the stage of grain filling and its effect on the studied indicators and yield should be investigated.
7
Gholamhosein homayouni; Nima Ahmadi; Mahmoud roozban
Abstract
This study was conducted to evaluate the effects of exogenous applications of salicylic acid on improvement of drought tolerance in Madagascar periwinkle (Catharanthus roseus L.). The experiment was arranged as factorial based on a completely randomized design (CRD). Salicylic acid concentrations of ...
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This study was conducted to evaluate the effects of exogenous applications of salicylic acid on improvement of drought tolerance in Madagascar periwinkle (Catharanthus roseus L.). The experiment was arranged as factorial based on a completely randomized design (CRD). Salicylic acid concentrations of 0, 0.5, 1, 1.5 mM were foliar sprayed on pot plants treated with three levels of irrigation including 30%, 60%, and 100% Field Capacity). Application of salicylic acid was repeated three times with three-day interval, while plants were exposed to drought stress for four weeks. The traits such as flower number, flower diameter, fresh weigh of individual flower, shoot number, and water use efficiency (WUE) were evaluated in this study. Based on the results, the effect of salicylic acid on severe deficit irrigation (30% PC) was significant, and the highest number of flowers at this level was observed in foliar application of 0.5 and 1 mM salicylic acid. Also, the highest fresh weight of single flower and number of sub-branches were obtained in application of 0.5 mM salicylic acid under severe deficit irrigation. In addition, exogenous salicylic acid at all levels significantly improved the flower diameter, which could have a major impact on the aesthetic properties of this plant under deficit-irrigation conditions. In total, due to availability of salicylic acid and easy use, foliar application of salicylic acid at 0.5 mM concentration would be recommended to improve Madagascar periwinkle drought tolerance under severe deficit irrigation.