Article,

Simulation of the phenology of soybeans

, and .
Agricultural Systems, 3 (4): 295--311 (October 1978)

Abstract

Simulation models of three phases of soybean phenology--sowing to primary leaf, primary leaf to flower initiation and flower initiation to flowering--were generated for the soybean cultivar Lee and others. The basic experimental data were obtained from a series of glasshouse experiments under six temperature regimes in natural light. The data for leaf development rates showed a change in the response to temperature at the first trifoliate leaf stage; this was incorporated into the model. The flower initiation model included parameters for the production and decay of a theoretical flower promoter and for the rate of change of daylength. Time to flower initiation showed a complex relationship to photoperiod which could not be described or approximated to by any simple function. The effects of temperature were marked and showed a strong interaction with photoperiod. The flower development model accounted for a strong temperature response which was conditioned by a photoperiod effect. The three models were combined to form a soybean phenology model which was validated against phenological data obtained from date of sowing experiments conducted under field conditions.

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