Abstract
The effects of seedbed tilth (coarse and fine) and different levels of nitrogen application (0–150 kg/ha N) on wheat response were studied in loam and sandy loam alluvial soils ( Typic Camborthids) at three sites under irrigated conditions. The percentage of dry aggregates > 4 mm was 36.7 and 50.8 at site 2 and > 10 mm was 44.3 and 70.2 at site 3 under fine- and coarse-tilth treatments, respectively. The variations in soil tilth were obtained either by use of different types of tillage implements, their combinations and sequence, or by variation in soil moisture content at the time of cultivation. Crop growth was better and grain yields under coarse-tilth were from 0.3 (0 N) to 1.2 t/ha (150 N) higher than under fine-tilth. Total mineral nitrogen (NO 3-N and NH 4-N) content was larger in coarse-tilth treatments than in fine-tilth treatments.
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