Effect of Irrigation on Soil Properties in Jakara Kano, Nigeria

Soil samples from the Jakara irrigation project site were evaluated with respect to possible degradation caused by irrigation. Most of the soils were neutral to alkaline with pH values ranging between ۶.۵۸ + ۰.۰۴ and ۱۰.۴۵ + ۰.۰۳. The electrical conductivity ranged from ۰.۳ + ۰.۰۱ to ۷۵.۲ + ۰.۰۶ dSm-۱ which implies low to very high salinity. The concentrations of the exchangeable cations in the soils follow the order Na+ > Mg۲+ > Ca۲+ > K+ with respective concentrations of ۸.۷۰ + ۰.۴ to ۱۸۷.۸ + ۰.۵ cmolcKg-۱, ۱.۰۶ + ۰.۰۵ to ۵.۴۹ + ۰.۰۵ cmolcKg-۱, ۰ to ۱۵ + ۰.۰۵ cmolcKg-۱ and ۰.۳۶ + ۰.۰۲ to ۲.۷۳ + ۰.۰۵ cmolcKg-۱. It was noted that Na+, a non-essential cation is dominant in the soil samples. The results showed ESP values much greater than ۱۵% for all the soil samples studied which implies high soil degradation. The available P and C:N ratios ranged from ۱.۰ + ۰.۰۱ to ۴.۹ + ۰.۰۶?gg-۱ and ۰.۲ to ۱۱.۰ respectively while the available K ranged from ۸ + ۰.۰۲ to ۱۳۸ + ۶?gg-۱ . It was observed that less than ۱۷% of the total K was available for plant uptake. The soil was noted to be clayey in nature with CEC values ranging between ۲۰ + ۲ and ۸۶ + ۵ cmolcKg-۱ with a ranking model indicating low fertility indices. REFERENCES Agbenin, J. O. (۱۹۹۵ a) Laboratory Manual For Soil and Plant Analysis (Selected methods and data analysis). Department of Soil Science, Faculty of Agriculture/ Institute for Agricultural Research, Ahmadu Bello University, Zaria.Agbenin, J. O. (۱۹۹۵ b) The phosphorus sorption by three Alfisols as influenced by pH. Fertilizer Res. ۴۴, ۱۰۷- ۱۱۲.Aseyeva, I. V. and Velikzhanina, G. A. (۱۹۶۶) Extraction and characterization of humus. Can. J. Soil Sci. ۵۴, ۳۱۷- ۲۴. Awotundun, E. F. (۱۹۷۳) Soil Analysis: A Manual for the Soil- Water Laboratory. Ministry of Agriculture and Natural Resources, Kano, Nigeria. pp. ۲۷-۶۱Ayers, R. S. and Westcot, D. W. (۱۹۸۵) Water Quality For Agriculture. Irrigation and Drainage Paper ۲۹ Rev. ۱. FAO, Rome.Bichi, M. H. 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کلیدواژه ها:

Fertility ranking ، Leaching ، Saline ، sodic ، Soil properties