PJB-2007-304
EFFECT OF BACTERICIDAL PLANTS TREATMENTS ON UREA HYDROLYSIS AND NITRIFICATION IN SOILS OF DIFFERENT CROPPING HISTORIES. PART-2. NITRIFICATION
M.A. AHMEDANI1, S. YASMIN2, M.A. ARAIN1, K.H. SHAH1, H. ABRO2 AND M. A. NAHYOON1
Abstract
Effect of some indigenous plants such as Prosopis, Azadirachta, Sphaeranthus and Cassia species, was studied on urea nitrogen transformations, especially nitrification. Soils selected from two different crop fields i.e. the wheat and kallar grass fields were used for incubation studies. Soil samples, up to depths of 0.5 meter were collected, to assess some important soil physico-chemical properties. Powdered plant material, @ 3% and 6%, was incorporated into the soils under study. The nitrogen released as NO3- –N was determined. The hydrogenase activity was determined to confirm the microbial growth index. Differential responses of indigenous plants on soil nitrification were observed in both the soils tested. The process of nitrification was slightly inhibited by the treatments of indigenous plants. Prosopis and Cassia treatments proved to be the most effective treatments for reducing N losses. Treatment effects of the wild indigenous plants will be useful in the maintenance of soil biological activities.
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