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Showing 2 results for Plastic Cover

Davood Niknezhad, Abolfazl Nasseri,
Volume 2, Issue 2 (9-2014)
Abstract


Abstract
The Global warming and climate change caused changes in rainfall patterns. Instead of snow, rainfalls are as precipitations which are not useful since usually they are lost as runoff or flood. Thus, proper recovery of precipitation especially snow and rain is very important, particularly in arid and semi-arid areas.By establishing rainwater harvesting systems with high runoff coefficients and storage of the runoff we can produce sustainable conditions to meet the water requirement of the plants and forest trees in the dryseasons. For this purpose, three treatment procedures including intact natural surfaces, areas covered with gravel, and use of plastic cover with gravel were selected and repeated thrice. The areas of each constructed experimental plot were 4m2squared shape, and their average slope was 11.5-18%.The results obtained from 16 occasions of rainfall showed that the recovered runoff obtained from natural surfaces with gravel, intact natural surfaces and plastic cover with gravel treatments were 7, 12 and 48 % of the rainfall, respectively.The rainfall thresholds to initiate runoff flows in the treatments were obtainedto be 4.4, 3.5 and 2.7 mm, respectively. The analysis of variance showed that the runoff from treatments were statistically significant at P<0.01. The mean comparison revealed that the highest runoff was produced by plastic surfaces with gravel treatment and this system is suggested as an appropriate option to harvest rainwater as a result of this study.
Heydar Tayefeh Rezaee, Kayvan Ranjbari, Mina Rahimi, Vahid Rezaverdinejad,
Volume 8, Issue 1 (6-2020)
Abstract

Low rainfall and its poor distribution in the West Azerbaijan province have hampered agricultural production in dry-land. One of the important solutions in this regard is converting rainfall into runoff. In this study, a field experiment in Khoshalan village of Urmia on grapes in rainfed conditions with supplementary irrigation and rainwater harvesting was carried out in a split-plot design based on randomized complete blocks for six years from 2000 to 2006. The first four years were for seedlings of plants, and recording of yield was possible in 2005 and 2006. The three factors studied include fertilizer application factor in 30 and 70% of the usual recommendation for irrigated cultivation, watershed area factor in areas of 12, 20, and 30 m2, and runoff surface status factor including normal traffic, plastic cover, and paving stones. In this study, the benefit is calculated based on the cost and income of 2019. The results showed that with increasing fertilizer consumption, yield decreased from 1755 to 1461 kg/ha, and benefit decreased from 81.2 to 46 million rials. This result indicates that under semi-dry conditions, fertilizer, cannot be consumed in large quantities. With decreasing watershed area, yield and benefit increased from 1018 to 2451 kg/ha and from 6.2 to 148 million rials, respectively. Plastic with 2208 kg/ha and 113.6 million rials had an increase in yield and profit of 54 and 86% compared to the control. Also, paving stones compared to the control, experienced 1 and 49% yield reduction, and profit respectively. According to the results of this study, an area of 12 m2, with plastic cover with 70% of the usual fertilizer recommendation for irrigated cultivation, increases the yield of rainfed grapes.

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مجله علمی سامانه های سطوح آبگیر باران Iranian Journal of Rainwater Catchment Systems
تکمیل و ارسال فرم تعارض منافع
نویسنده گرامی ، پس از ارسال مقاله ، جهت دریافت فرم، لطفا بر روی کلمه فرم تعارض منافع کلیک نمایید و پس از تکمیل، در فایل های پیوست مقاله قرار دهید.
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