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PROTON-DAYS are a single value daily numerical index of metabolic activity. Just as DEGREE-DAYS give a measure of the stimulus that the plant experiences due to the weather, PROTON-DAYS give a measure of the response of the plant to this weather stimulus. PROTON-DAYS accumulate each day just as do DEGREE-DAYS.
The PHYTOGRAM proton assay can be used to compute the buildup of PROTON-DAYS at a site. The ratio of PROTON-DAYS to DEGREE-DAYS gives a numerical response/stimulus index of crop performance. PROTON-DAYS can be used to quantify performance between sites.
Technical Extract from presentation at ASEV 52nd Annual Meeting, San Diego, California, June 2001
Proton-Days A Metabolic Activity Indicator
Experimental evidence suggests the diurnal cycle of electrical potential of a noble metal sensor implanted in the extracellular region of plant tissue is an indicator of the diurnal cycle in extracellular proton concentration. Proton transfers back and forth across the cell membrane are part of a wide variety of cellular metabolic processes. The magnitude of the change in proton concentration of the extracellular fluid each day can be used as a indication of the magnitude of this activity for that day. This magnitude is termed a "Proton-Day". A typical Proton-Day value for vigorous vines is 180 while poorly performing vines will have a Proton-Day value of 65 under the same basic environmental conditions. Proton-Days can be added up in the same manner as "Degree-Days" to yield a seasonal numerical index for a vineyard. Furthermore, the Proton-Day per Degree-Day ratio forms a quantitative response/stimulus ratio for rating vineyard performance.
|PHYTOGRAM - Applications and specifications||Automatic Point and Band Dendrometers - For precise measurements of growth|
|POD - In the field data collection over extended periods of time||Manual Band Dendrometers - Schematic drawing and product characteristics|
|Equipment Cost and Support Services - Products, Services, and typical packages||Automatic Root Dendrometers - For measurement of diurnal cycles and growth rates of roots near the surface.|
|Environmental Sensors - For concurrent assays of air and ground temperature, light, and soil moisture||Sensor Cluster Layout - Field layouts of sensors for production and research applications|
|Data Transfer Methods - Various alternatives|
|Irrigation Scheduling- Optimize irrigation with the PHYTOGRAM technique||Communicating with Agricultural Electronics Corporation - By E-mail, Post Office, Telephone and Fax|
|Proton-Days - Quantify plant response to weather at different sites (similar to Degree-Days)||Dendrometer User Group Pages|
|Sucrose Transport - Method of determining magnitude and uniformity of sucrose transport between leaf and fruit||Water Content of Specific Crops|
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