公开(公告)号：EP1409993A1

公开(公告)日：2004-04-21

申请号：EP02748210.8

申请日：2002-07-19

Applicant: THE BOARD OF REGENTS OF OKLAHOMA STATE UNIVERSITY

Inventor： STONE, Marvin, L. ,  NEEDHAM, DUANE ,  SOLIE, John, B. ,  RAUN, William, R. ,  JOHNSON, Gordon, V.

IPC: G01N21/35 ,  A01C21/00 ,  G01J3/427 ,  G01N21/47

CPC classification number: A01C21/007 ,  G01J3/427 ,  G01J3/433 ,  G01N21/3563 ,  G01N21/4738 ,  G01N2021/3155 ,  G01N2021/3181 ,  G01N2201/0627 ,  G01N2201/0691 ,  G01N2201/0694

Abstract: A spectral reflectance sensor including: a light source for emitting a modulated beam of red light; a light source for emitting a modulated beam of near infrared light; a receiver for receiving reflected light produced by either the red source or the near infrared source; a receiver for receiving incident light from either the red source or the infrared source; a signal conditioner responsive to the modulation such that the signals produced by the receivers in response to reflected and incident light from the source can be discriminated from signals produced by ambient light; and a microprocessor having an input such that the microprocessor can determine the intensities of incident red light, reflected red light; incident near infrared light; and reflected near infrared light. From these intensities, and by knowing the growing days since emergence or planting, the sensor can calculate the mid-growing season nitrogen fertilizer requirements of a plant.

公开(公告)号：EP1411758A1

公开(公告)日：2004-04-28

申请号：EP02748217.3

申请日：2002-07-19

Applicant: THE BOARD OF REGENTS OF OKLAHOMA STATE UNIVERSITY

Inventor： RAUN, William, R. ,  JOHNSON, Gordon, V. ,  SOLIE, John, B. ,  STONE, Marvin, L.

IPC: A01C21/00

CPC classification number: A01C21/007

Abstract: A method for in-season macro and micronutrient application based on predicted yield potential and a nutrient response index. The inventive method includes the steps of: determining a nutrient response index for a field, determining the normalized difference vegetation index (NDVI) of an area to fertilize; determining a predicted crop yield for the area; determining an attainable crop yield for the area; determining the nutrient requirement for the area as the difference between the nutrient removal at the attainable yield minus the nutrient removal at the predicted yield, adjusted by the efficiency of nutrient uptake in the particular crop. In one preferred embodiment, processing requirements at the time of application of the nutrient are eased by generating a lookup table of nutrient requirement relative to measured NDVI prior to application of the nutrient.