Comparison of Field Calibrations for Mehlich 3 P and K with Bray. P1 and Ammonium Acetate K for Corn

Douglas Brian Beegle, T. C. Oravec

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Because of both economic and environmental concerns, soil testing is becoming an increasingly important component of crop-production systems. This increasing demand for soil testing will necessitate more efficient methods for routine soil testing. The Mehlich-3 soil test has been proposed as an extractant that can be used for simultaneous extraction of several nutrients including both P and K. Before this extractant can be used in place of the current extractants, it must be evaluated in field calibration studies. This study was designed to compare the ability of the Mehlich-3 extractant to predict corn (Zea mays L.) yield response to P and K with the Bray-Kurtz P1 extractant for P and the neutral, 1N ammonium acetate extractant for K. A field study was conducted at 67 locations across Pennsylvania over 4 yr. A factorial arrangement of P (0 and 88 kg ha-1) and K (0 and 168 kg ha-1) was applied at each location. Corn-grain yield was measured as the response parameter. The Mehlich-3 extractant was highly correlated with the Bray-Kurtz P1 extractant (r=0.99) and neutral, 1N ammonium acetate K extractant (r=0.96). The calibrations for the Mehlich-3 P and Bray-Kurtz P1 were similar. While there was a large amount of scatter in both data sets, a Cate-Nelson partitioning of the data resulted in critical levels of 43 and 45 kg P ha-1 for the Bray-Kurtz P1 and Mehlich-3 P extractants, respectively. The calibrations for the Mehlich 3 and the neutral, 1N ammonium acetate extractants were also similar. Again there was considerable scatter in the data. The Cate-Nelson critical levels for K were 0.20 and 0.24 cmol kg-1 for the Mehlich 3 and neutral, 1N ammonium acetate extractants, respectively. On this basis it appears that the Mehlich 3 is at least as good as the currently used extractants for P and K and could readily replace them in Pennsylvania. At the same time the large amount of scatter indicates the need for a more mechanistic approach to soil testing.

Original languageEnglish (US)
Pages (from-to)1025-1036
Number of pages12
JournalCommunications in Soil Science and Plant Analysis
Volume21
Issue number13-16
DOIs
StatePublished - Aug 1 1990

Fingerprint

ammonium acetate
soil analysis
acetate
calibration
ammonium
maize
corn
soil
yield response
soil test
crop production
production system
production technology
partitioning
Zea mays
grain yield
economics
comparison
nutrient
nutrients

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Soil Science

Cite this

@article{a220fab637184ab6b6c9e5cce49adb6a,
title = "Comparison of Field Calibrations for Mehlich 3 P and K with Bray. P1 and Ammonium Acetate K for Corn",
abstract = "Because of both economic and environmental concerns, soil testing is becoming an increasingly important component of crop-production systems. This increasing demand for soil testing will necessitate more efficient methods for routine soil testing. The Mehlich-3 soil test has been proposed as an extractant that can be used for simultaneous extraction of several nutrients including both P and K. Before this extractant can be used in place of the current extractants, it must be evaluated in field calibration studies. This study was designed to compare the ability of the Mehlich-3 extractant to predict corn (Zea mays L.) yield response to P and K with the Bray-Kurtz P1 extractant for P and the neutral, 1N ammonium acetate extractant for K. A field study was conducted at 67 locations across Pennsylvania over 4 yr. A factorial arrangement of P (0 and 88 kg ha-1) and K (0 and 168 kg ha-1) was applied at each location. Corn-grain yield was measured as the response parameter. The Mehlich-3 extractant was highly correlated with the Bray-Kurtz P1 extractant (r=0.99) and neutral, 1N ammonium acetate K extractant (r=0.96). The calibrations for the Mehlich-3 P and Bray-Kurtz P1 were similar. While there was a large amount of scatter in both data sets, a Cate-Nelson partitioning of the data resulted in critical levels of 43 and 45 kg P ha-1 for the Bray-Kurtz P1 and Mehlich-3 P extractants, respectively. The calibrations for the Mehlich 3 and the neutral, 1N ammonium acetate extractants were also similar. Again there was considerable scatter in the data. The Cate-Nelson critical levels for K were 0.20 and 0.24 cmol kg-1 for the Mehlich 3 and neutral, 1N ammonium acetate extractants, respectively. On this basis it appears that the Mehlich 3 is at least as good as the currently used extractants for P and K and could readily replace them in Pennsylvania. At the same time the large amount of scatter indicates the need for a more mechanistic approach to soil testing.",
author = "Beegle, {Douglas Brian} and Oravec, {T. C.}",
year = "1990",
month = "8",
day = "1",
doi = "10.1080/00103629009368288",
language = "English (US)",
volume = "21",
pages = "1025--1036",
journal = "Communications in Soil Science and Plant Analysis",
issn = "0010-3624",
publisher = "Taylor and Francis Ltd.",
number = "13-16",

}

Comparison of Field Calibrations for Mehlich 3 P and K with Bray. P1 and Ammonium Acetate K for Corn. / Beegle, Douglas Brian; Oravec, T. C.

In: Communications in Soil Science and Plant Analysis, Vol. 21, No. 13-16, 01.08.1990, p. 1025-1036.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Comparison of Field Calibrations for Mehlich 3 P and K with Bray. P1 and Ammonium Acetate K for Corn

AU - Beegle, Douglas Brian

AU - Oravec, T. C.

PY - 1990/8/1

Y1 - 1990/8/1

N2 - Because of both economic and environmental concerns, soil testing is becoming an increasingly important component of crop-production systems. This increasing demand for soil testing will necessitate more efficient methods for routine soil testing. The Mehlich-3 soil test has been proposed as an extractant that can be used for simultaneous extraction of several nutrients including both P and K. Before this extractant can be used in place of the current extractants, it must be evaluated in field calibration studies. This study was designed to compare the ability of the Mehlich-3 extractant to predict corn (Zea mays L.) yield response to P and K with the Bray-Kurtz P1 extractant for P and the neutral, 1N ammonium acetate extractant for K. A field study was conducted at 67 locations across Pennsylvania over 4 yr. A factorial arrangement of P (0 and 88 kg ha-1) and K (0 and 168 kg ha-1) was applied at each location. Corn-grain yield was measured as the response parameter. The Mehlich-3 extractant was highly correlated with the Bray-Kurtz P1 extractant (r=0.99) and neutral, 1N ammonium acetate K extractant (r=0.96). The calibrations for the Mehlich-3 P and Bray-Kurtz P1 were similar. While there was a large amount of scatter in both data sets, a Cate-Nelson partitioning of the data resulted in critical levels of 43 and 45 kg P ha-1 for the Bray-Kurtz P1 and Mehlich-3 P extractants, respectively. The calibrations for the Mehlich 3 and the neutral, 1N ammonium acetate extractants were also similar. Again there was considerable scatter in the data. The Cate-Nelson critical levels for K were 0.20 and 0.24 cmol kg-1 for the Mehlich 3 and neutral, 1N ammonium acetate extractants, respectively. On this basis it appears that the Mehlich 3 is at least as good as the currently used extractants for P and K and could readily replace them in Pennsylvania. At the same time the large amount of scatter indicates the need for a more mechanistic approach to soil testing.

AB - Because of both economic and environmental concerns, soil testing is becoming an increasingly important component of crop-production systems. This increasing demand for soil testing will necessitate more efficient methods for routine soil testing. The Mehlich-3 soil test has been proposed as an extractant that can be used for simultaneous extraction of several nutrients including both P and K. Before this extractant can be used in place of the current extractants, it must be evaluated in field calibration studies. This study was designed to compare the ability of the Mehlich-3 extractant to predict corn (Zea mays L.) yield response to P and K with the Bray-Kurtz P1 extractant for P and the neutral, 1N ammonium acetate extractant for K. A field study was conducted at 67 locations across Pennsylvania over 4 yr. A factorial arrangement of P (0 and 88 kg ha-1) and K (0 and 168 kg ha-1) was applied at each location. Corn-grain yield was measured as the response parameter. The Mehlich-3 extractant was highly correlated with the Bray-Kurtz P1 extractant (r=0.99) and neutral, 1N ammonium acetate K extractant (r=0.96). The calibrations for the Mehlich-3 P and Bray-Kurtz P1 were similar. While there was a large amount of scatter in both data sets, a Cate-Nelson partitioning of the data resulted in critical levels of 43 and 45 kg P ha-1 for the Bray-Kurtz P1 and Mehlich-3 P extractants, respectively. The calibrations for the Mehlich 3 and the neutral, 1N ammonium acetate extractants were also similar. Again there was considerable scatter in the data. The Cate-Nelson critical levels for K were 0.20 and 0.24 cmol kg-1 for the Mehlich 3 and neutral, 1N ammonium acetate extractants, respectively. On this basis it appears that the Mehlich 3 is at least as good as the currently used extractants for P and K and could readily replace them in Pennsylvania. At the same time the large amount of scatter indicates the need for a more mechanistic approach to soil testing.

UR - http://www.scopus.com/inward/record.url?scp=0000312314&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000312314&partnerID=8YFLogxK

U2 - 10.1080/00103629009368288

DO - 10.1080/00103629009368288

M3 - Article

AN - SCOPUS:0000312314

VL - 21

SP - 1025

EP - 1036

JO - Communications in Soil Science and Plant Analysis

JF - Communications in Soil Science and Plant Analysis

SN - 0010-3624

IS - 13-16

ER -