Short-term Effects of N-fixing Legumes onSome Propertiesof Calcareous Salt-affected Soils

Khalafalla Mohammed Ali Yousif, Mubarak Abdelrahman Abdalla, Elsiddig A. E. Elsheikh, Elsadig Agabna Elhadi, Norikazu Yamanaka, Fatoma Ali Mohammed Rezig


Cultivation of legumes in calcareous salt-affected soils may decrease soil sodicity. A field experiment was conducted in Soba Research Station, 15 km south of Khartoum, to determine the potential of three N fixing legumes: guar (Cyamopsistetragonolobus), hyacinth bean (Dolichos lablab L.) and cowpea (VignaunguiculataL) in amelioration of sodic soils. The treatments consist of control (without plant and gypsum), gypsum, cowpea; guar and hyacinth bean relying on either inorganicnitrogen or N fixation. Treatments were arranged in a RandomizedComplete Block Design with four replications. Soil samples (0-25 and 25-50 cm depths) were taken before and after harvest and analyzedfor pH, electrical conductivity (ECe), soluble cations (Ca2+, Mg2+, Na+, K+), soluble HCO3-and sodium adsorption ratio (SAR). Results of the first season indicated that pH and ECe were not significantly different among treatments whereas;Ca2+, Na+and SAR were significantly (P ≤ 0.001) different among treatments. Total dry matter of hyacinth bean relying on N-fixation was higher than the hyacinth bean relying on inorganic N by 49.4%. In the second season, total dry matter of guar relying on N-fixation was 36% higher than that relying on inorganic Nwhereas hyacinth bean relying on N-fixation has increased soil soluble HCO3-1and decreased SAR.Itmay be concluded that cultivation of N-fixing plants in calcareous salt-affected soils could be a promising alternative to chemical amendments which may be expensive for small farmers.


Amelioration; phytoremediation; sodic soils;solubilization

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