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• W2187164016 abstract "In many regions of the earth, notably in the subtropics, the annual rainfall is not enough to meet the evaporative need of a complete vegetative cover on the soil. Likewise, the drylands in Ethiopia, which fall within the range of UNEP's definition of desertification cover 860 000 km 2 or 71.5% of the country's total land area. In spite of the fact that the irrigation potential is estimated to be 3 637 000 ha Ethiopia uses only about 300000 ha currently. Basically, irrigation is an agricultural operation, which supplies the need of a plant for water. However, irrigation adds salts to soil including boron if it isn't used systematically. Soil salinization in its early stages of development reduces soil productivity, but in advanced stages kills all vegetation and consequently transforms fertile and productive land to barren land, leading to loss of habitat and reduction of biodiversity. Hence a soil survey was conducted in the irrigated fields of cereal growing areas of semi arid north Ethiopia in order to examine the concentration of soil boron. Twelve soil profile pits in six different areas were opened wherein soil samples from three depths, viz. 0-30, 30-70 and 70-100 cm were collected. The boron concentrations were determined in a hot 0.01 M CaCl2 extracts using Inductively- Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The study revealed that hot water extractable boron contents of 0-30 cm depth soils varied from 0.19-1.38 ppm and the average value was 0.74 ppm. If 0.3 ppm is taken as the critical value for deficiency then the potential boron deficient areas occupy 16.6 %, if the critical value is accepted as 0.5 ppm for deficiency then the potential boron deficient areas occupy 33.3 % of the soils in the semi arid north Ethiopia. If 2.5 ppm is accepted as the possible critical level for boron toxicity then all the studied soils were found is potentially non-toxic for boron. The average boron levels of the soils did not significantly differ along the soil depth. The average boron values were 0.74, 0.69 and 0.65 ppm in the soil depths of 0-30, 30-70 and 70-100 cm, respectively. Emerging boron toxicity was observed in the Luvisols of Hizat at depth of 30-70 cm where the soil boron content was 2.35 ppm. Besides, pH of all the studied soils was alkaline (pH>7.0). Generally, boron concentrations in the irrigated fields of semi arid north Ethiopia were varied from 0.14 to 2.35 ppm with an average and median of 0.69 and 0.42 ppm, respectively. Besides, 25.7% of the soils were boron deficient and boron deficiency seems a greater problem than boron toxicity in the rainfed cereal growing areas of the arid northern Ethiopia. (Researcher 2010;2(4):28-37). (ISSN: 1553-9873)." @default.
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• W2187164016 title "Boron Status in the irrigated fields of semi arid north Ethiopia" @default.
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