Articles
PREDICTING PHENOLOGICAL EVENTS OF CALIFORNIA PROCESSING TOMATOES
Article number
487_2
Pages
41 – 48
Language
Abstract
A method for predicting tomato plant phenology using heat units and incorporating high temperatures which appear to delay maturity is described.
Degree-day >10°C accumulation to 21 plant growth stages was determined using 536 data sets collected from commercial processing tomatoe fields in California’s Sacramento Valley over 4 years.
Accumulations from seedling emergence to harvest was greater for later planting dates, an in warm years.
Regression analysis indicated that tomato plant development was delayed when temperatures exceeded 30°C. A model which utilizes degree-days and incorporates a developmental delay whenever the daily maximum temperature exeeds 30°C is proposed to predict time from emergence to 9 of the plant growth stages.
Model validation indicated significant accuracy and robustness of predictions compared to observed dates of when stage 9 growth (75–90% ripe fruit) is reached.
Degree-day >10°C accumulation to 21 plant growth stages was determined using 536 data sets collected from commercial processing tomatoe fields in California’s Sacramento Valley over 4 years.
Accumulations from seedling emergence to harvest was greater for later planting dates, an in warm years.
Regression analysis indicated that tomato plant development was delayed when temperatures exceeded 30°C. A model which utilizes degree-days and incorporates a developmental delay whenever the daily maximum temperature exeeds 30°C is proposed to predict time from emergence to 9 of the plant growth stages.
Model validation indicated significant accuracy and robustness of predictions compared to observed dates of when stage 9 growth (75–90% ripe fruit) is reached.
Publication
Authors
Frank G. Zalom, L.T. Wilson
Keywords
tomato, phenology, model, temperature, heat, development, California
Online Articles (94)