A sruDY OF 1HE CHARACfERISTICS OF 1HE PECAN TREE
FOR USE IN OBJECTIVE YIELD FORECASTS
Ronald A. Wood
Research and Developnent Branch
Standards and Research Division
Statistical Reporting Service
Table of Contents
Summary of Major Findings • .•
Data Collection •••••••••• ................................................................
COlUlts on Sanlple Lims
Drop Counts ..••.•.••••
COlUlts with Spotting Scope
.Mal Y5 is
Count of Nuts on Sample Limbs Expanded to Tree Totals •••••.•••• 13
Counts of Nuts from Photographs .•••••••.••••..•.••••••••••.••••
Counts of Nuts on Individual Sample Trees Through a
Concluding RelllClrks •••••••••••••••••.••••••••••••••••••••••••••
A STIJDY OF TIlE CHAAACfERISTICS
OF TIlE PECAN TREE
FOR USE IN OBJECfIVE YIELD FORECASTS
Ronald A. Wood
fOlUld in pecan crop forecasts during past years have
led the industry to request that additional studies be made by SRS for the
improvement of the pecan forecasts.
These additional studies were begun In 1970 when a pilot research project
was set up by the Research and Development
Branch (S&RD, SRS) in cooperation
with the Mississippi
State Statistical Office (SRS).
The objectives of the
project were (1) to examine different methods of estimating the number of nuts
on a pecan tree, and (2) to detennine which if any of these methods might be
useful in improving early season forecasts of production.
The pecan tree presents one major obstacle which is not found in other
fruit and nut studies.
The tree is extremely tall; sometimes taller than
This is a problem since present objective yield fruit and nut crop
models are based on expansion of nut counts on selected sample lirrbs from the
"entire tree" to tree totals.
For the pecan crop forecasting model to be
based on sample limb expansion