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.
Masoud Mohammadi; Hossin Molavi; Abdolmajid Liaghat; Masoud Parsinejad
Abstract
Salinity and water stress are the main problems of agricultural production in many parts of the world, especially in arid and semi-arid areas. Therefore, this study was conducted to investigate the effects of Zeolite application under salinity and ...
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Salinity and water stress are the main problems of agricultural production in many parts of the world, especially in arid and semi-arid areas. Therefore, this study was conducted to investigate the effects of Zeolite application under salinity and water stress conditions on yield and yield components of Corn in Karaj, Iran. A factorial design with randomized complete block arrangement was used with three replications including three factors: salinity, irrigation water, and Zeolite application. Irrigation water, salinity and Zeolite application factors consisted of two levels each:W1=100% and W2=50% of crop water requirement; S1=0.7, S2=5 dS/m, and Z1=0 and Z2=10 t/ha, respectively. The soil texture was clay loam. Results showed that salinity and water stresses reduced yield and yield components, while Zeolite application increased them. Simultaneous impact of salinity, deficit irrigation, and Zeolite application had significant effect on corn yield, the 1000 kernels weight, number of grains per ear, and plant height. The maximum corn yield, 1000 seeds weight, number of grains per ear, and plant height were, respectively, 7233.3 kg/ha, 309 g, 504, and 220.7 cm and corresponded to W1S1Z2 treatment, while the minimum corn yield, 1000 seeds weight, number of grains per ear and plant height were 2296 kg/ha, 101.7 g, 159, and 146.3 cm, respectively, and belonged to W2S2Z1 treatment. The maximum water use efficiency (1.41 kg/m3) and its minimum (0.68 kg/m3) were observed in W2S1Z2 and W1S2Z1 treatments, respectively.
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.
Niazali Ebrahimipak; M MOSTASHARI
Abstract
This study investigated the effect of water stress and different amounts of zinc, manganese, and boron fertilizers on yield components and water use efficiency of sugar beet. The experiment was conducted for three years in Qazvin, Iran, with two-factor factorial design in randomized complete block ...
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This study investigated the effect of water stress and different amounts of zinc, manganese, and boron fertilizers on yield components and water use efficiency of sugar beet. The experiment was conducted for three years in Qazvin, Iran, with two-factor factorial design in randomized complete block and three replicates including irrigation and fertilizer treatments. Irrigation treatments consisted of four intervals i.e. 6, 9, 12 and 15 days (treatments E1 to E4) and fertilizer levels included fertilizers based on soil test (30 kg boric acid/ ha , 40 kg zinc sulfate / ha and 30 kg manganese sulfate /ha,), 30 percent less than the recommended fertilizer (21 kg boric acid/ ha ,28 kg zinc sulfate /ha, 21 kg manganese sulfate /ha) and 30 percent more than the recommended fertilizer (39 kg boric acid / ha , 52 kg zinc sulfate /ha and 39 kg manganese sulfate / ha) treatments, respectively, F1, F2, and F3. Statistical analysis of sugar beet root yield showed significant (at 5% level) differences between irrigation treatments and fertilizer treatments. Treatment E1F3 produced a yield of 64696 kg/ ha, while E4F3 produced 41736 kg/ha that was the lowest yield. Average root yield of F2 treatmentswas more, but, in the case of F1, the amount of sugar level was higher. In the wettest irrigation treatment, root yield increased with increasing fertilizer rates. It is suggested that when water stress conditions occur, use of fertilizer in excess of the recommended levels should be avoided. The volumes of irrigation water applied in irrigation intervals of 6, 9, 12 and 15 days were, respectively, 9659, 8104, 6677, and 5398 cubic meters per hectare. Water productivities for irrigation interval of 15 days and F2, F1, and F3 were, respectively, 8.39, 8.38, and 7.73 kg beetroot per cubic meter of water, reflecting the most efficient use of irrigation water.