--What Is BioQUEST?
--BioQUEST
|Collection
--Collection
|Candidates
--First Review
|Folder
|--BeeVisit
|--BENZER
|--BIRDD
|--Convince Me
|--Curacao
|--Diffusion Laboratories
|--DNA Electrophoresis
|--EcoBeaker
|--Epidemiology
|--HH
|--Image Analysis
|--Inherit
|--Interactive Calculus
|Problems in Biology
|--Investigative Cases
|and Case-Based
|Learning in Biology
|--Lateblight
|--Metabolic Pathways
|--Morphogenetic
|Construction Kit
|--PEACH
|--Phylogenic Investigator
|--PurifyIt!
|--RateIt!
|--Real Time Data
|Aquisition
|--Resistan
|--Sampling
|--SimBio2
|--Wading Bird
|
--Extended Learning
|Resources
--Software Materials
--Support Materials

	PEACH
	Yaffa L. Grossman (Beloit College), Theodore M. DeJong (University of California, Davis), and Scott F. Vosburg (Independent Software Developer)
Screen Shots | System Requirements

IPEACH simulates the annual carbon supply and demand in peach trees. Calculations represent the amount of carbon produced in photosynthesis and the amount of carbon used for growth and respiration. The program simulates tree growth on a daily basis for one growing season. Students may use PEACH to test their understanding of integrated plant growth. It models typical horticultural operations such as thinning and pruning. The effects of different environments on tree growth and crop yield can also be studied using PEACH.

Fruit, leaf, current-year stem, branch, trunk, and root weight are the state variables in PEACH. The minimum and maximum air and soil temperatures, degree-days, solar radiation, and canopy light interception are the driving variables. The rate variables that characterize photosynthesis, maintenance respiration, and growth are derived from experimental studies on PEACH.

PEACH provides a graphical user interface that allows selection of cultivar, orchard spacing, training system, weather data, location, and other parameters. Full season model runs take approximately 45 seconds on a Pentium personal computer. Graphical output is possible and spreadsheet output is Excel-compatible. Help is available on-line and in manual format. Default variables for one cling peach cultivar in four training systems and one freestone peach cultivar in one training system are provided, so that theoretical simulations may be conducted without obtaining site-specific data for each simulation.

Screen Shots

In the simulation depicted above, some of the developing fruits were removed on Day 150. Thinning increases individual fruit weight, but it also greatly decreases total crop yield.

System Requirements

Windows 3.1 or greater

• DOS 5.0 or greater
• Processor with 4 MB of RAM (preferably a 486DX with 8 MB of RAM).
• 10 MB free hard disk space.
• VGA or better monitor.