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An experiment was conducted at Agronomy Research Field of Bangladesh Agricultural Research Institute, Gazipur for five consecutive years (20142015 to 2018-2019) to establish a functional relationship between grain yield and spikes/m of wheat at late sown condition. Variation of spikes/m was created by five seed rates (90, 120, 150, 180 and 210 kg/ha). Pooled average value of spikes / m was observed the highest (479-506) in 180-210 kg seed /ha. From the structural treatment, the highest grain yield (pooled average of 3876-4153 kg/ha ranged 32955028 kg/ha) of wheat was produced in the seed rate of 150-180 kg/ha. The estimated optimum seed rate was found 162.29 kg/ha with the estimated grain yield 3989 kg/ha of wheat at late sown condition through the developed function model of Y=485.91+43.17X-0.133X (R=0.87). Again, the estimate optimum spikes/m was noticed 423 when the estimated grain yield of wheat was 4135 kg/ha at late sown condition through the developed functional model of Y=-2837+32.98X0.039X (R=0.83). The grain yield would be increased about 13% as compared to recommended seed rate (120 kg/ha) of wheat. Spikes / m had significant positive correlation with seed rate (r=0.79 at p=0.05) of wheat. Relationship between observed grain yield and predicted grain yield (when relationship between spikes/m and grain yield) showed a good consistency (Y=1.0006X, R=0.94 and r = 0.97 at p<0.01). From the results of the study it is concluded that 162 kg/ha of seed rate and 423 spikes / m would be optimum for maximum yield) 4135 gk/ah) of wheat at late sown condition.

Functional Relationship Between Grain Yield and Spikes Per Square Meter of Wheat as Influenced by Seed Rate Under Late Sown Condition