Yield and N-uptake of wheat (Triticum aestivum L.) under different fertility levels and crop sequence

The investigations were carried through a series of experiments in two years to confirm the results of two cropping sequences with application of three fertilizer levels. Wheat planted after soybean produced better biological yield (6470.33 kg per ha), maximum harvest index (42.14%), satisfactory grain yield (2763.33 kg per ha) and higher N-uptake (119.26 kg per ha). The increased levels of nitrogen and phosphorus at 150-50 NP kg per ha respectively increased biological yield (7235.50 kg per ha), harvest index (44.18%), grain yield (3198.19 kg per ha) and N-uptake (114.01 kg per ha). The better yield and soil fertility could be obtained by the inclusion of leguminous crop at least once in a two year cropping sequence, because leguminous crops enrich soil fertility by fixing environmental nitrogen in their root nodules, which in turn supply residual food nutrients to the succeeding crop.