Degree-day models for vegetable varieties and weeds:

  • Croptime Calculator:  go to this site to use Croptime vegetable and weed models

  • Quick Guide: tri-fold brochure with step-by-step guide to using Croptime

  • Quick Start Video: 9 minute video demonstrating how to use Croptime

  • Introduction to Degree-day Models: short pdf fact sheet (coming soon)

  • Questions or comments contact Nick Andrews.

Vegetable and Weed Degree-day Models

Croptime introduces degree-day (DD) models for vegetable varieties and weeds. Vegetable models can help schedule planting dates and predict harvest dates. Initial findings indicate that DD models are more accurate than calendar days at predicting harvest. Weed models can predict development of first germinable seed, and help reduce the risk of weed seed rain. To date we have:

  • Four transplanted broccoli models
  • One transplanted and six direct-seeded cucumber models
  • Three models predicting first viable seed set for hairy nightshade, lambsquarter and redroot pigweed

New models will be posted online when available. Sweet pepper and sweet corn models are coming soon. Spinach, carrot, parsnip, lettuce, cauliflower, cabbage, kale, summer squash, snap bean and tomato models will be online by spring 2017. Click on the orange links below for more information.

Croptime workshops:

  • Contact Heidi Noordijk to receive announcements about future Croptime workshops, tel: 971-801-0392.

Croptime Modelling:

If you are interested in helping to collect data for new Croptime models, please review the Croptime Growth Stage Guide below, and contact Nick Andrews for more information. 503-913-9410.

  • Croptime Growth Stage Guide: 38 page pdf guide that describes vegetable growth stages and provides instructions and a data sheet for collecting crop development data for new vegetable degree-day models.

Funding to develop Croptime has been provided by Western Sustainable Agriculture Research and Education program (project SW12-037), Oregon Tilth, Inc. and the Clackamas Extension Innovation program. Click on the WSARE and Oregon Tilth logos below for more information about these organizations.