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Winter wheat: A model for the simulation of growth and yield in winter wheatThe basic ideas and constructs for a general physical/physiological process level winter wheat simulation model are documented. It is a materials balance model which calculates daily increments of photosynthate production and respiratory losses in the crop canopy. The partitioning of the resulting dry matter to the active growing tissues in the plant each day, transpiration and the uptake of nitrogen from the soil profile are simulated. It incorporates the RHIZOS model which simulates, in two dimensions, the movement of water, roots, and soluble nutrients through the soil profile. It records the time of initiation of each of the plant organs. These phenological events are calculated from temperature functions with delays resulting from physiological stress. Stress is defined mathematically as an imbalance in the metabolite supply; demand ratio. Physiological stress is also the basis for the calculation of rates of tiller and floret abortion. Thus, tillering and head differentiation are modeled as the resulants of the two processes, morphogenesis and abortion, which may be occurring simulaneously.
Document ID
19820024913
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Baker, D. N. (Agricultural Research Service Mississippi State, MS, United States)
Smika, D. E. (Agricultural Research Service Mississippi State, MS, United States)
Black, A. L. (Agricultural Research Service Mississippi State, MS, United States)
Willis, W. O. (Agricultural Research Service Mississippi State, MS, United States)
Bauer, A. (Agricultural Research Service Mississippi State, MS, United States)
Date Acquired
September 4, 2013
Publication Date
August 24, 1981
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
YM-U2-04281
E82-10367
JSC-18229
NASA-CR-169164
NAS 1.26:169164
Accession Number
82N32789
Funding Number(s)
PROJECT: PROJ. AGRISTARS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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