H. Afshar; Hossin Sadrghaen
Abstract
In areas with limited water resources, one of the main goals of irrigation is to maximize the water per unit volume. In corn planting two major options for increasing of water productivity are plant density and growing pattern. In order to achieve the above goal in Corn” Karaj 700”, an study was ...
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In areas with limited water resources, one of the main goals of irrigation is to maximize the water per unit volume. In corn planting two major options for increasing of water productivity are plant density and growing pattern. In order to achieve the above goal in Corn” Karaj 700”, an study was conducted in strip split plots in frame of complete randomized block design with 3 replications in Khorasan Agricultural and Natural Resources Research Center for 3 years. Irrigation treatments were subsurface drip irrigation with 3 levels (50, 75 and 100 percent of full water requirement) in the vertical plots and plant density with 3 levels (65,75 and 85 thousands plants per hectare) in horizontal plots. In addition sub plots were including one and two rows planting pattern on 75 cm furrows. The results showed that irrigation water affected only on corn yield. The maximum yield in all three years was achieved by 100 percent of full water requirement treatment and the minimum yield was observed in 50 percent of full water requirement. The effect of subsurface drip irrigation on water consumption was not significant in the first year but it was significant in the last two years. The most water consumption was achieved by 100 percent of full water requirement treatment. Besides 3 levels of plant density and 2 planting types were not affected on water consumption. Plant height was affected by water quantity in 3 years furthermore this trait was affected by planting type in the second and third year. The maximum and the minimum of plant height were in 100 percent of full water requirement and 50 percent of of full water requirement respectively. The weight of 300 grains in different treatments was affected by planting type in the second year and in the third year this trait was affected by irrigation levels.
H. Afshar; Hossin Sadrghaen; hamid reza mehrabadi
Abstract
To decree evapotranspiration from soil surface and improving irrigation efficiency and reduce water usage in cotton cultivation , plastic mulch was applied in furrow irrigation. This study was performed as a split plot experiment in capability randomized complete block design, in 3 replications. The ...
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To decree evapotranspiration from soil surface and improving irrigation efficiency and reduce water usage in cotton cultivation , plastic mulch was applied in furrow irrigation. This study was performed as a split plot experiment in capability randomized complete block design, in 3 replications. The experiment was located in Khorasan Razavi –Kashmar- Kashmar agricultural research station and was applied in 2 years, 2004-2005. The treatments were consist of irrigation period at three levels ; 6, 9 and 12 days as main plot and plastic mulch at three levels I-black plastic mulch, II- white plastic mulch and III- control (without plastic mulch)as a subplot on furrow irrigation. Each treatment was irrigated up to field capacity. The results showed that application of plastic mulch used better water usage and black plastic mulch was more effective. Meanwhile The results showed that the use of plastic mulch had significant effect on reducing of weed growth, plant height increasing, yield and water use efficiency in respect with control.
H. Sadrghaen; M. Akbari; H. Afshar; M.M. Nakhjavanimoghaddam
Abstract
Abstract
This study was conducted to determine the impacts of different drip irrigation method and amount of water on yield and water use efficiency of tomato in Varamin Agricultural Research Center, Iran. The study was done during two years. Experimental design was randomized complete blocks design ...
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Abstract
This study was conducted to determine the impacts of different drip irrigation method and amount of water on yield and water use efficiency of tomato in Varamin Agricultural Research Center, Iran. The study was done during two years. Experimental design was randomized complete blocks design (RCBD) in split plot with three replications. Three different drip irrigation method; surface drip irrigation with in-line emitter tubes, surface drip irrigation (tape), and subsurface drip irrigation (tape) as main plot and three different amount of water (50, 75 & 100% water requirement) were as sub-plot. The result showed that subsurface drip irrigation (tape) and 100% water requirement treatment has the highest yield, but there was no significant difference between it and surface drip irrigation with in-line emitter tubes and 75% water requirement treatment. Water use efficiency in surface drip irrigation with in-line emitter tubes with 75% water use and subsurface drip irrigation (tape) with 100% water use were greater than other treatments. According to the results, under no limitation on water resources, the best option is subsurface drip irrigation (tape) with using 100% water requirement and under water limitation the best option is surface drip irrigation with in-line emitter tubes using 75% water requirement.
Keywords: Micro Irrigation, Water Use Efficiency, Tomato, Varamin
J. Tabatabaee Yazdi; A. Haghayeghi; M. Ghodsi; H. Afshar
Abstract
Abstract
Rainwater harvesting (RWH) is one of the most effective water resources management techniques for confrontation with water shortage condition. RWH which is basically known as a traditional method, has been developed rapidly and being used widely in dryland countries throughout the world. RWH ...
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Abstract
Rainwater harvesting (RWH) is one of the most effective water resources management techniques for confrontation with water shortage condition. RWH which is basically known as a traditional method, has been developed rapidly and being used widely in dryland countries throughout the world. RWH is defined as collecting and storing rainwater from nearby catchment and delivering it to planting area during critical stages of plant requirement. RWH can be divided into two main categories which is known as micro and macro catchment methods. Many factors such as rainfall amount and distribution, ground topography, soil type, economical and social aspects are important for selecting a specific RWH category. In the present paper, design and performance of a real size macro catchment RWH project located in a semi arid region (N-E of Iran), is described. The project is comprised from a 5000 m2 plastic covered catchment, 500 m3 ground reservoir and an experimental cultivation area located next to runoff catchment which is planted with dryland wheat. Planting area is consisted of 8 scaled plots with dimension of 6m by 85 m. Following a randomized completely blocks design, four plots were considered for supplementary irrigation and the rest four replications were accounted as control (without irrigation). In an effort to conserve more water, drip irrigation system was used with 4 lit/hr/m discharge capacity. The results of two years study indicated that, compared to the conventional dry land farming undertaken in the control plots, wheat grain yield was increased by 70% and 87% respectively. During the study period, 35% and 70% of wheat water requirement was supplied from RWH system during plant growth period respectively. The result showed that it would be possible to have productive wheat cultivation in the regions with 250 mm annual precipitation (in average), if one can employ an effective RWH system.
Keywords: Rainwater harvesting, Supplementary irrigation, Rainfed wheat, Mashhad region
