Appeal No. 1999-1101
Application 08/727,125
technique compares meter readings from the reference strip and
the bulk field at a minimum of three locations in each field
and, at each location, the average reading of 30 plants from
the reference area and the adjacent bulk field should be
compared (under "How to sample"). Because chlorophyll meter
readings vary with the time of day, readings from the
reference strip and the bulk field should be taken at about
the same time (id.). Peterson forecasts that "[p]otential
uses of these techniques in the future may include remote
sensing by satellite or airplane to schedule the need for
additional fertilizer N" (under "The chlorophyll meter as an N
management tool").
Demetriades-Shah discloses an experiment to determine if
a change in crop color due to nitrogen stress (lack of
nitrogen) can be assessed in terms of leaf chlorophyll
concentrations using crop reflectance measurements.
Demetriades-Shah discloses that "leaf chlorophyll
concentration assessed on a plant weight basis is strongly
influenced by the nutrient status of the soil and by the
growth stage of the crop, rising after germination and then
declining as crop growth rate increases" (pp. 1049-50).
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