A01C 21/007
Determining fertilization requirements
Official title: {Determining fertilization requirements}
A01C21/007 (Determining fertilization requirements) appears on 407 US grants and 545 published applications in this corpus.
Search patents in A01C- Granted patents
- 407
- Published applications
- 545
- Assignees
- 239
- Inventors
- 1,065
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 4 | 1 |
| 2003 | 5 | 6 |
| 2004 | 3 | 3 |
| 2005 | 4 | 4 |
| 2006 | 0 | 0 |
| 2007 | 3 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 5 |
| 2010 | 1 | 3 |
| 2011 | 4 | 4 |
| 2012 | 3 | 12 |
| 2013 | 6 | 9 |
| 2014 | 5 | 12 |
| 2015 | 10 | 15 |
| 2016 | 9 | 12 |
| 2017 | 10 | 22 |
| 2018 | 17 | 33 |
| 2019 | 28 | 50 |
| 2020 | 34 | 56 |
| 2021 | 31 | 55 |
| 2022 | 38 | 58 |
| 2023 | 42 | 60 |
| 2024 | 43 | 55 |
| 2025 | 52 | 42 |
| 2026 | 39 | 26 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and system for providing a fertilizer recommendation and a measurement region and location22 Sep 2026US 12,740,507 B2Yara International Asa
- Aeration type variable-rate fertilization scarifier for tea garden25 Aug 2026US 12,714,008 B2
- Printed potentiometric sensors to measure ion concentration in soil25 Aug 2026US 12,716,860 B2The Regents of the University of California
- Apparatus and method for direct nitrate sensing in soil18 Aug 2026US 12,710,415 B2Wisconsin Alumni Research Foundation
- Growing media evaluation system and method14 Jul 2026US 12,680,999 B1Predictive Nutrient Solutions, Inc.
- Compositions and Methods for Agri-Inputs and Uses Thereof8 Oct 2026US 2026/0308077 A1Tidal Vision Products
- Field-grown cotton growth status assessment and prediction system based on unmanned aerial vehicle red-green-blue imagery17 Sep 2026US 2026/0278763 A1Institute of Cotton Research, Chinese Academy of Agricultural Sciences
- Crop yield component map20 Aug 2026US 2026/0245208 A1Deere & Company
- Simplified nitrogen fertilizer rate recommendation method based on nitrogen balance benchmark30 Jul 2026US 2026/0215360 A1Institute of Agricultural Resources and Regional Planning, CAAS
- Systems and methods for detection of agricultural characteristics16 Jul 2026US 2026/0198408 A1Deere & Company
Most cited
By later US patents
- Variable rate agricultural product application implement with multiple inputs and feedback280US 6,070,539 ACase Corporation · 2000
- Soil chemical sensor and precision agricultural chemical delivery system and method154US 5,033,397 AAguila Corporation · 1991
- Crop stand analysis119US 9,489,576 B2F12 Solutions, LLC. · 2016
- Optical spectral reflectance sensor and controller113US 6,596,996 B1The Board of Regents for Oklahoma State University · 2003
- Closed-loop variable rate applicator104US 5,355,815 AAg-Chem Equipment Co., Inc. · 1994