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Abstract

The response of wheat (Triticum aestivum L.) genotypes on yield and yield components under different plant population densitics were examined under field conditions for two years. The population densities were managed through row spacing of 15 and 30cm at seeding rates of 100, 150 and 200 There were large treatment and cultivar treatment (seeding rate and row spacing) interactions for plant height, spike length. number of spikelets/spike, number of grains/spike and spike yield. The narrow row spacing with higher seeding rate treatments averaged 13.8% more grain yield than the standard spacing (30 cm) and seeding rate (100 kgha) over two successive cropping seasons. The grain yeld increased at narrow row spacing (15cm) in combination with higher seeding rates (150 and 200 kgha") and was averaged to be 16.2% and 18.8% in 1994-95 and 8.9% and 12% in year 1995-96 respectively. Non significant cultivar * treatment x year interactions existed for all the measured traits Spike yield. number of grains/spike and spikelet, number of spikelets/spike and spike length were reduced at higher seeding rates (200 kgha) and narrow row spacing (15 cm), while enhanced at lower seeding rates (100 kgha) with wider row spacing (30cm). The studies revealed that the average grain yield of spring wheat may be increased with combination of higher seeding rates (150 kgha") and narrow (15 cm) row spacing

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