Expolinear model on soybean growth in Argentina and Brazil

Ciência Rural

Adriana Elisabet Confalone²  Marcos Silveira Bernardes¹  Luiz Claudio Costa¹  Ciro Abbud Righi¹  Durval Dourado Neto¹  Thomas Newton Martin¹  Paulo Augusto Manfron¹  Carlos Rodrigues Pereira¹ 

[1] ,Universidad Nacional del Centro de la Provincia de Buenos Aires Facultad de Agronomía ,Argentina

关键词: water deficit;    solar radiation;    temperature;    phenological phase;    déficit hídrico;    radiação solar;    temperatura;    fase fenológica;   

DOI  :  10.1590/S0103-84782010000500002

来源: SciELO

【 摘 要 】

Predicting crop growth and yield with precision are one of the main concerns of the agricultural science. For these purpose mechanistic models of crop growth have been developed and tested worldwide. The feasibility of an expolinear model for crop growth was evaluated on predicting growth modification on soybean (Glycine max L. Merrill) of determined and undetermined growth cultivars, submitted to water restrictions imposed on different phenological stages. An experiment was carried out in Azul/Argentina and in Viçosa/Brazil during the growing seasons (1997/1998, 1998/1999 and 2002/2003). The expolinear model was adjusted to the dry-matter data obtained from each treatment. The model showed sensibility of Rm (maximum relative growth rate of the culture - g g-1 day-1) to variation in air temperature; of Cm (maximum growth rate of the culture - g m-2 day-1) to solar radiation and of Tb (lost time -day) to water stress. Cm values were higher without water restriction presenting, in both countries, a direct correlation with solar radiation. Without water restrictions, Rm values were lower when the average air temperature during the cycle was lower. It was observed that under water stress the culture had a bias to present higher Rm values. Tb was lower in the irrigated treatments than in those with water deficits. The analysis of the outputs clearly shows the feasibility of the expolinear model to explain the differential growth rates of soybean as a consequence of climatic conditions.

【 授权许可】

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