Definition of soybean reaction for day length on degree of plants" vegetative growth completeness

Geographical plantings at latitudes 45 and 50є used for an estimation of soybean genotypes‟ reaction to length of day. Thus for an estimation of soybean photoperiodic sensitivity used not frequency algorithms of measure estimation of asymmetry and completeness of vegetative growth. The maximum visually distinguishable distinctions in latitude values of photoperiodic sensitivity parameters are found out on factor of vegetative growth completeness Kcc. On the basis of the received results the empirical morphological express method of soybean genotypes‟ preliminary estimation on reaction to the photoperiod based on visual comparison of the lengths sums of three bottom and three top plant internodes is developed.