The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 2002
Filed:
Jun. 23, 2000
Stefan Reusch, Dülmen, DE;
Norsk Hydro ASA, Oslo, NO;
Abstract
A method of partial area-specific-fertilization of plants which, under natural light during the fertilizer application, the chlorophyll content of the plants is ascertained by means of sensors by optical reflection measurement in the visible and near infrared spectral range, the chlorophyll content is registered and from the chlorophyll content a measurement of the nutrient state of the plant is determined and from the nutrient state of the plants a computer controls the fertilizer quantity to be applied, characterized in that the reflection measurements are taken simultaneously as inclined measurements with respect to the nadir with measurement devices oriented oppositely to one another free from shadows with light guides an the influence of the solar azimuth angle is eliminated by detecting the noise signals from all measurement directions.