Rasoul asadi; Frzad hasanpour; Mitra Mehrbani; amin baghizadeh; Fatemeh Karandish
Abstract
Using proper irrigation management leads to optimum utilization of water, soil, and fertilizer and production of high yield and quality products. In order to investigate the effect of irrigation intervals and surface and subsurface drip irrigation systems on growth indicators of Rosmarinus officinalis ...
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Using proper irrigation management leads to optimum utilization of water, soil, and fertilizer and production of high yield and quality products. In order to investigate the effect of irrigation intervals and surface and subsurface drip irrigation systems on growth indicators of Rosmarinus officinalis L., a field experiment was carried out during 2015 growing seasons at an experimental farm in Kerman city. The treatments were laid out in split plot using a Randomized Complete Block Design with three replications. The treatments comprised three irrigation levels (I 1 =25, I 2 =40 and I 3 =55 mm evaporation from class A pan) in the main plots, and two drip irrigation systems (surface and subsurface) in the sub plots. The results showed that I 2 in comparison with I 1 treatment led to 44 mm water saving. However, dry weight, height of plants, number of shoots per plant and leaf area index decreased by 12.9%, 12.6%, 13.6% and 5.3 percent, respectively, while water use efficiency increased 3.6 percent. Also, results showed that water use efficiency, dry weight, height of plants, number of shoots per plant, and leaf area index increased by, respectively, 15.1%, 18.3%, 9.7%, 12.5% and 15 percent in subsurface drip irrigation compared to surface method. Therefore, for Rosmarinus officinalis L. cultivation in Kerman area, application of I 2 in subsurface drip irrigation system is the best way to increase the water use efficiency for the drought years.
Mohammad Zounemat Kermani; rasool asadi
Abstract
Considering the limited water resources in arid and semi-arid climate of Iran, deficit irrigation is one of the strategies for efficient use of water and increasing water use efficiency in agricultural districts. In order to study the effects of deficit irrigation on the quantitative traits of ...
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Considering the limited water resources in arid and semi-arid climate of Iran, deficit irrigation is one of the strategies for efficient use of water and increasing water use efficiency in agricultural districts. In order to study the effects of deficit irrigation on the quantitative traits of Thymus vulgaris L., an experiment was conducted in Kerman Municipality seedling production station in 2016. The experimental treatments were arranged as randomized complete block design with three replications. The irrigation regimes consisted of full irrigation (FI-100), regulated deficit (RDI75% and RDI55%) and partial root zone drying irrigation (PRD75% and PRD55%). The results showed that the highest herbage dry weight (1670.6 kg/ha) and leaf area index in different stages of growth were produced by full irrigation treatment, while no significant difference between this treatment and PRD75 was observed. Also, the highest number of shoots (64.4) and plant height (39.4 cm) were produced by full irrigation treatment and there was significant difference between this treatment and other treatments. However, the highest water use efficiency (0.66 kg/m3), root fresh weight (4.5 g), root depth (15.8 cm) and root volume (2.8 cm3 per plant) appeared in PRD75. Therefore, 75 percent water replacement in partial root zone drying irrigation treatments, in addition to saving water consumption, provides better use of soil moisture and sunlight. Thus, this treatment can be considered as suitable approach to cope with the water crisis and achieve a sustainable agriculture.
p a; m d; r a
Abstract
The effect of soil matric potential on yield and growth parameters of three varieties of cucumber in greenhouse was carried out during 2012 and 2013 growing seasons in Jiroft area. The treatments were laid out in randomized complete block design with three replications. The treatments were comprised ...
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The effect of soil matric potential on yield and growth parameters of three varieties of cucumber in greenhouse was carried out during 2012 and 2013 growing seasons in Jiroft area. The treatments were laid out in randomized complete block design with three replications. The treatments were comprised of three soil matric potentials of 45, 60, and 75 centi-bar for initiation of irrigation in the main plot and sub plot consisted of three cucumber varieties (Negin, Hilarious and Dominos). The results showed that water use in treatments 45, 60, and 75 centi-bar tensions was, respectively, 6300, 5100, and 3900 m3 ha-1, which was 18% less than irrigation based on Class A pan evaporation.. Fruit yield, LAI, plant height, and fruit diameter decreased 2.7%, 2%, 2%, 0.73% and 2.3 percent, respectively, but water use efficiency increased 22 percent. On the other hand, yield in Dominos variety compared to Negin and Hilarious increased 6.2% and 6.4 percent, respectively, and water use efficiency increased 13.2% and 13.7 percent, respectively. According to the results, planting Dominos variety and 60 centi-bar soil matric potential for irrigation initiation is recommended to achieve the highest water use efficiency.
m z; r a; h d
Abstract
Due to limitation of conventional water resources, the use of unconventional water for agriculture is unavoidable. Therefore, in order to investigate the effect of using different amounts of municipal wastewater on yield, yield components and water use efficiency of cotton in drip irrigation systems, ...
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Due to limitation of conventional water resources, the use of unconventional water for agriculture is unavoidable. Therefore, in order to investigate the effect of using different amounts of municipal wastewater on yield, yield components and water use efficiency of cotton in drip irrigation systems, a field experiment was carried out during 2010 and 2011 growing season at experimental farm of Jopar Agriculture and Natural Resources Research Center in Kerman province. The treatments were laid out in split plot with a Randomized Complete Block Design (RCBD) with three replications. The treatments were comprised of three levels of irrigation including 100% (control), 80%, and 60 percent of crop water requirement in the main plot, and two water qualities (groundwater and wastewater) as sub plot, under surface drip irrigation system. The results showed reduction of pH and increment of soil salinity due to the high concentration of elements such as Na and K in the wastewater. Also, comparison of 100 percent with 80 percent of water requirement using wastewater showed a water saving of 1800 m3 ha-1, while water use efficiency was increased 18 percent. However, the same treatment caused a decrease of 1.5%, 2.1%, 2.9%, 15.2%, and 11.6 percent in yield, number of boll, boll weight, plant height, and leaf area index, respectively. Considering the results obtained in this study, to cope with the water shortage in the country and increase water use efficiency, make use of wastewater, and conserve water, applying 20 percent less water than the full crop water requirement of cotton is recommendable in Kerman,.
SH K; R A; M S
Abstract
With population growing throughout the world, it is necessary to optimize water use,especially in agricultural lands. In order to conduct technical and economical evaluation ofdrip and furrow irrigation methods under deficit irrigation of cotton, a field experiment wascarried out during 2010 growing ...
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With population growing throughout the world, it is necessary to optimize water use,especially in agricultural lands. In order to conduct technical and economical evaluation ofdrip and furrow irrigation methods under deficit irrigation of cotton, a field experiment wascarried out during 2010 growing season at experimental farm of Orzoueyeh Agricultural andNatural Resources Research Center in Kerman province. The treatments were laid out in splitplot a randomized complete block design (RCBD) with three replications. The treatmentscomprised of three levels of irrigation including 100% (control), 80%, and 60 percent of cropwater requirement and were allocated to the main plot and two irrigation systems, consistingof furrow (S1) and surface drip irrigation (S2), were laid in the sub plot. The results showedthat in comparison with furrow irrigation, drip irrigation increased yield, water use efficiency(WUE), number of bolls per plant, and bolls weight by 8%, 44%, 15% and 33%, respectively.Also, compared with 100 percent of crop water requirement, the 80% treatment reduced waterusage by 1900 m3 ha-1, while yield, number of bolls per plant, and bolls weight decreased by1.6%, 9% and 3.6%, respectively, but WUE increased by 18%. Economic efficiency showedthat 80 percent of water requirement in the drip irrigation system was the best treatment.Considering the results obtained in this study and in the light of water saving and higherWUE, as the main objectives in deficit irrigation, for cotton cultivation in Orzoueyeh,application of 80% crop water requirement in the drip irrigation system is preferred.
Shahram Karimi; Rasoul Asadi; Mohammadeza Mohammadrezakhani
Abstract
In order to investigate the effect of deficit irrigation and position patterns tube to increase water use efficiency of cotton, a field experiment was carried out during 2009 and 2010 growing season at experimental farm of Orzoueyeh Agriculture and Natural Resources Research Center in Kerman province. ...
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In order to investigate the effect of deficit irrigation and position patterns tube to increase water use efficiency of cotton, a field experiment was carried out during 2009 and 2010 growing season at experimental farm of Orzoueyeh Agriculture and Natural Resources Research Center in Kerman province. The treatments were laid out in strip split plot a Randomized Complete Block Design with three replications. The treatments were comprised of three levels of irrigation including 100, 80, 60 percent of crop water requirement in main plot and sub plot consisted of two irrigation systems (surface drip irrigation system (S1), subsurface drip irrigation system (S2)) and two tape position patterns (conventional (L1) and alternative (L2)). The results showed that In comparison with 100 percent of crop water requirement, 80 percent of water requirement caused parsimony of water usage equal 1300 m3 ha-1, and yield, WUE, number of bolls per plant and bolls weight increased 8.5%, 4%, 10% and 2.5% respectively. Also I3 compared with I1 savin about 3400 m3 ha-1 of irrigation water, and increase WUE was 8% but yield loss, number of bolls per plant and bolls weight decreased 18%, 25% and 18% respectively. Considering the results obtained in this study in the light of water saving as the main object in deficit irrigation and water use efficiency (WUE) for cotton cultivation in Orzoueyeh, the 80% of crop water requirement on subsurface drip irrigation is preferred.
r a; r asadi
Abstract
Deficit (or regulated deficit) irrigation is one way to improve efficiency of water use when crop is exposed to a certain level of water stress during a particular growth period. In order to optimizing water use under tape irrigation system, a field experiment was carried out ...
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Deficit (or regulated deficit) irrigation is one way to improve efficiency of water use when crop is exposed to a certain level of water stress during a particular growth period. In order to optimizing water use under tape irrigation system, a field experiment was carried out during 2010 growing season at the experimental farm of Agriculture and Natural Resources Research Center of Orzoueyeh, located in Kerman province. The treatments were laid out in completely randomized block design with three replications., Four water potential thresholds for starting the irrigation treatments were selected by using tensiometers (net water requirement (control) and suctions of 1/2 FC, 1/5 FC and 1/8FC). The crop studied was corn, single cross 704 cultivar. The results showed that water use volumes saved in the three suction treatments consisting of treatments 1/2 FC, 1/5 FC and 1/8FC were 11%, 13% and 17 percent, respectively, in comparison with the control treatment. But, compared to the control, yield of the mentioned treatments decreased by 4 %, 28%, and 34 percent, respectively. However, water use efficiency increased in the 1/2 FC treatment by 6.5% over the control treatment. Statistical analysis of yield components in the control and 1/2 FC treatments demonstrated that these two treatments were in the same group. Among the evaluated treatments, the control and 1/2 FC treatments were economically satisfactory.