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根据复式光温综合作用基本原理和野生大豆、栽培大豆叶片感光效应规律，研究代表性纬度大豆在不同光周期、开花期生育指标变化规律。８小时光周期纬度间开花期生育指标差最小、栽培大豆均比同纬度野生大豆晚开花，确定为典型短光。１６．５小时光周期纬度间开花期生育指标差最大，栽培大豆均比同纬度野生大豆早开花，确定为典型长光。讨论确定４０°Ｎ至３５°Ｎ地带自然光温综合作用是栽培大豆起源的主要依据［６］，讨论确定野生大豆感光效应敏感，栽培大豆对温度适应性强的依据。
According to the basic principle of compound light and temperature, and the photosynthetic effect of wild soybean and cultivated soybean leaves, the changing rules of reproductive indices of representative latitude soybean at different photoperiod and flowering stage were studied. The 8-hour photoperiod latitude showed the smallest difference in the fertility index at flowering stage. The cultivated soybean all bloomed later than the wild latitude at the same latitude, and was identified as typical short-light. The 16.5-hour photoperiod latitude showed the greatest difference in fertility index between flowering stages. All the cultivated soybean flowered earlier than wild soybean at the same latitude and were identified as typical long light. Discuss to determine the natural light and temperature in the 40 ° N to 35 ° N zone is the main basis for the origin of cultivated soybean [6], discussed to determine the sensitive sensitivity of wild soybean, cultivated soybean adaptability to temperature.