Inorganic Nitrogen Status Of Tropical Soils As Affected By Simulated Drying and Rewetting Field Conditions

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Singb B. R.
Uriyo A. P.
Byabacbwezi J. M.
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Inorganic N release from nitrogenous constituents in tropical soils is affected by several factors such as drying (Birch, 1958;Singh and Kanehiro, 1970a), drying-rewetting cycles (Birch, 1964; Aglarwal et al .• 1971J,a),agrochemicals added in various operations(Singh et al.. 1969; Aga'rwal et al .. 1971b,1972a; Singih and Kanehiro, 1972), and at times exposure to high energy radiation Singh and Kanehiro, 1970b; Agarwal] et al ..1972b). Effects of drying alone and drying rewetting cycles on ,inorganic N status are of practical significance in the East African soils. Most of Ealst Africa enjoys two distinct rainy seasons, short-rains during November December and long rains during March and May. The rainfall pattern during recent years, however, is becoming erratic in that the off season rain 'are quite frequent. Between the rains the weather is reasonably hot and renders soil fairly dry. Thus, over the year a soil encounters continuous dry spell, and intermittent drying and rewetting which are expected to affect its inorganic N status.
East African Agricultural And Forestry Journal, XLIV (NO. 3), p. 206-213