Simulating growth, fresh weight and size of individual fruits under water and nitrogen limitations with the CROPGRO-Tomato model
Crop growth models are valuable tools to understand the impact of water and N fertilization management on tomato production. The CROPGRO-Tomato model simulates fruit fresh weight and size based on simulated dry weight fruit-1, a dry matter concentration that varies as a function of fruit physiological age, and a diameter function dependent on fresh weight fruit-1. But there are insufficient connections of these functions to the model's simulation of water or N stresses. The existing water and N stress factors in the model were linked to new equations that affect timing and rate of dry weight growth per fruit and dry matter concentration of individual fruits. The model with these modifications and the reducing factors SWFAC, TURFAC and NSTRES was successfully used to predict the stress-induced variations in dry matter concentration, and reductions in dry and fresh weight growth and size of single fruits, as well as reductions in total crop growth and fruit yield. The newly-added subroutine for predicting dry matter concentration, fruit fresh weight, and size, along with coupling to water and N stresses make the improved model a valuable risk assessment tool for predicting fresh market production and quality of tomato.
Rybak, M.R., Boote, K.J., Jones, J.W. and Zotarelli, L. (2017). Simulating growth, fresh weight and size of individual fruits under water and nitrogen limitations with the CROPGRO-Tomato model. Acta Hortic. 1182, 137-144
tomato, crop modeling, fruit growth, fresh weight, size, water deficit, nitrogen deficit