摘要：An experiment was conducted at Agronomy Research Field of Bangladesh
Agricultural Research Institute, Gazipur for five consecutive years (2014-
2015 to 2018-2019) to establish a functional relationship between grain
yield and spikes/m2 of wheat at late sown condition. Variation of
spikes/m2 was created by five seed rates (90, 120, 150, 180 and 210
kg/ha). Pooled average value of spikes / m2 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 3295-
5028 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-0.133X2
(R2=0.87). Again, the estimate optimum spikes/m2 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+32.98X0.039X2
(R2=0.83). The grain yield would be increased about 13% as
compared to recommended seed rate (120 kg/ha) of wheat. Spikes / m2
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/m2
and grain yield) showed a good
consistency (Y=1.0006X, R2=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 / m2 would be optimum for maximum yield) 4135 gk/ah) of wheat
at late sown condition.
关键词：Functional model; grain yield; spikes/m2; wheat; late sown
