Impact of black nightshade on tomato plant production and mathematical model fitness

Planta Daninha

Instituto Politécnico de Beja, Beja, Portugal¹  Instituto Superior de Agronomia, Lisboa, Portugal¹  Moreira, I¹  Portugal, J.M¹ 

关键词: competition;    linear model;    hyperbolic model.;   

DOI  :  10.1590/S0100-83582009000500003

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

Mathematical models are useful for estimating the impact of weeds on crops. The objectives of this study were to elucidate the interaction of Solanum nigrum (black nightshade) with tomato plants in direct and transplanted sowing and to evaluate the impact of different infestation densities and competition time periods on tomato plant production. Between 1991 and 2001, five field experiments were conducted in the tomato growing region of Portugal using the additive method, keeping crop density constant, while changing the number of weeds from 0 and 6 plants m-2. The weed and crop coexistence period was also evaluated, from transplantation/sowing to the beginning of flowering or until harvest. The tomato yield loss results were fitted to linear and hyperbolic models. Yield losses at the lowest densities of black nightshade follow a linear model. Black nightshade is a highly competitive species in relation to the tomato plant either when the crop is sown or when it is transplanted. Production losses were higher when the crop was sown than when it was transplanted.

【 授权许可】

Unknown