Effect of Humic Acid and Leaching Factor on Clay Soils Content of Organic Matter and Productivity of Wheat under Different Levels of Irrigation with Saline Water

Mohammed Khaldon Dormish*(1) M. Hossam Bahlawan(1) Wafaa Ahmad Issa(2) and Yousef Waled Khalaph(1)

 (1). Department of Soil and Land Reclamation, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.

(2). Faculty of Science, University of Aleppo, Aleppo, Syria.

(*Corresponding Author: Dr. Mohammed Khaldon Dormish. E-Mail: aaobahlawan@gmail.com).

Received: 11/10/2018                                Accepted: 03/12/2018


An experiment was carried out under the conditions of the green house at the Faculty of Agriculture, University of Aleppo. The aim of the research is to determine the effect of humic acid addition to the irrigated soils by saline water on its content of organic carbon and wheat yield. The experiment was carried out according to a split-spilt plot design. The main plots included three levels of irrigation with water salinity (W1:0, W2:3, W3:6 g-1 NaCl), three levels of gypsum were mixed with soil: (G1:0, G2:25, G3:50 g) and three levels of humic acid were added with irrigation water (H3:48, H2:24, H1:0 kg/h). The coefficient of leaching with irrigation water (W3 and W2) was applied at %10 and %20 of the field capacity, respectively. The results showed that the addition of humic acid increased the stock of organic carbon. The highest percentage of organic matter (2.70%) was found in the deep soil layer (W3G3H3), while the lowest ratio was (1.41%) in the surface layer of soil (W3G2H1). The role of humic acid, especially at the level of H3, was clearly demonstrated in increasing the yield and weight of 1000 grains of wheat crop. The study confirmed the role of the leaching factor in organic carbon losses in the soil, where organic carbon losses was (26.31%) with leaching factor of 10%, and (44.74%) with leaching factor of 20%.

Key words: Humic acid, Organic matter, Wheat yield, Salinity.

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