# US 2023/0266290 A1 · Soil Analysis Compositions and Methods

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- Number: US 2023/0266290 A1
- Document ID: US20230266290A1
- Status: Published application
- Kind: A1
- Application number: 18/004,415
- Filed: 2021-05-20
- Published: 2023-08-24
- Earliest claimed: 2020-07-15
- Assignees: Precision Planting LLC
- Applicants: Precision Planting LLC
- Inventors: Richard Petroski; Rachel Nelson
- Web page: https://patentgrep.com/patent/US20230266290A1

## CPC

- G01N 33/24: Earth materials (G01N33/42 takes precedence)
- G01N 1/38: Diluting, dispersing or mixing samples
- G01N 1/4077: {by other techniques involving separation of suspended solids}
- G01N 21/658: {enhancement Raman, e.g. surface plasmons}
- G01N 21/77: by observing the effect on a chemical indicator
- G01N 21/80: Indicating pH value
- G01N 31/22: using chemical indicators (G01N31/02 takes precedence)
- G01N 31/221: {for investigating pH value}
- A01C 21/007: {Determining fertilization requirements}
- G01N 21/31: Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)}
- G01N 33/245: {for agricultural purposes}
- G01N 2001/383: {collecting and diluting in a flow of liquid}
- G01N 2001/4088: {filtration}
- G01N 2021/7763: {Sample through flow}
- G01N 2021/7783: {Transmission, loss}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- A01C: PLANTING; SOWING; FERTILISING (parts, details or accessories of agricultural machines or implements, in general A01B51/00 - A01B75/00)

## Abstract

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

## Claims

### Claim 1

A method of analyzing buffer pH in soil, the method comprising:
a) obtaining a soil sample;
b) adding a liquid to the soil sample to form a soil slurry;
c) flowing the soil slurry through a filter to form a filtrate;
d) blending an indicator composition with the filtrate to form a soil mixture; and
e) flowing the soil mixture through an analysis tool along a flow direction whereby a buffer pH value of the soil mixture is measured; and
wherein the flow direction is oriented such that the soil mixture flows downward at least partially under the effects of gravity.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the liquid comprises water and the soil slurry of step b) is formed at a weight ratio of soil sample to liquid ranging from about 1:2 to about 1:4.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the indicator is selected from one of bromocresol green sodium salt, nitrazene yellow, chlorophenol red sodium salt, and phenol red sodium salt.

### Claim 4 (depends on 1)

The method according to claim 1, wherein an extractant is blended with the soil slurry.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the extractant comprises sikora buffer.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the soil slurry of steps b) and c) and soil mixture of step e) is substantially free of surfactant.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the soil slurry of steps b) to d) is not subject to a centrifuge force.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the soil mixture of steps e) is not subject to a centrifuge force.