Exploration of Responses to Potassium in Western Uruguay

Several regions of Uruguay has recently shown K deficiencies and responses. This project looks to determine the different areas with K deficiency, evaluate responses in the main field crops, and provide information on K soil testing.

IPNI-2007-URY-2

Field trials and field observations in 2005 have shown K deficiencies in corn and grain sorghum at western Uruguay areas. Read more


Year of initiation:2007
Year of completion:?
Map:

Interpretive Summary

This research is based on previous observations of potassium (K) deficiency and responses to K fertilization in field crops grown within the northwestern Uruguay region. Data from the initial field work, including 50 experiments under wheat, barley, maize, soybean, sunflower, and sorghum, indicated a critical soil K concentration of 0. 30 to 0. 40 cmol/kg i. e. , soil test K (STK) of 117 to 156 ppm .

This research is based on previous observations of K deficiency and responses to K fertilization in field crops grown within the northwestern Uruguay region. Data from the first three years of field work and other studies, including 50 experiments under wheat, barley, maize, soybean, sunflower, and sorghum, indicated a critical K concentration of 0. 30 to 0. 40 cmol/kg (i. e. , soil test K STK of 117 to 156 ppm).

This research is based on previous observations of K deficiency and responses to K fertilization in field crops grown within the northwestern Uruguay region. Data from the first 3 years of field work and other studies, including 50 experiments under wheat, barley, maize, soybean, sunflower, and sorghum, indicated a critical K concentration of 0. 30 to 0. 40 cmol/kg (i. e. , soil test K STK of 117 to 156 ppm).

This research is based on previous observations of K deficiency and responses to K fertilization in field crops grown within the northwestern Uruguay region. Data from the first three years of field work and other studies, including 50 experiments under wheat, barley, maize, soybean, sunflower, and sorghum crops, indicated a critical K concentration of between 0. 30 to 0. 40 cmol/kg (i. e.

This research is based on previous observations of K deficiency and responses in field crops grown within the northwestern Uruguay region. Data from the first three years of field work and other studies, including 50 experiments under wheat, barley, maize, soybean, sunflower, and sorghum crops, indicated a critical K range of 0. 30 to 0. 40 cmol/kg (117 to 156 ppm), below which there is a high probability of response to K fertilization.

This research is partly based on previous observations of K deficiency and responses in field crops grown within the northwestern Uruguay region. Data from the first 3 years of field work and other studies, including 50 experiments under wheat, barley, maize, soybean, sunflower, or sorghum, indicated a critical range of 0. 30 to 0. 40 cmol/kg (117 to 156 ppm), below which there is a high probability of response to K fertilization.

This research is partly based on previous observations of K deficiency and responses in field crops grown within the northwestern Uruguay region. Field experiments in the first 3 years of this study (2006/07, 2007/08, and 2009/10) have also showed significant responses to K fertilization.

This research is partly based on previous observations of K deficiency and responses in field crops grown within the northwestern Uruguay region. Field experiments in the first 2 years of this study (2006/07 and 2007/08) have also showed significant responses to K fertilization. For the 2008/09 season, three field experiments under corn, wheat/soybeans, and barley/soybeans were established at a site with exchangeable soil K of 0.

Previous observations have indicated possible K deficiencies and responses in field crops within the northwestern Uruguay region. In the first year of this study during the 2006/07 season, a field experiment also showed a significant response to K fertilization. For the 2007/08 season, three corn experiments were established under different ecological situations within western Uruguay.

Previous observations have indicated possible K deficiencies and responses in field crops within the northwestern Uruguay region. In the 2006/07 season, a field experiment was carried out to evaluate K responses in corn. The experiment was located within the Constitucion soil series and available soil K was low (0. 16 cmol/kg exchangeable K) at the site.

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Updates & Reports

2016

Potassium research at Uruguay

2015

Response to K at the long-term experiment La Manera farm

2013

Soil Potassium in Uruguay: Current Situation and Future Prospects

2010

2010 Annual Report

2009

Exploration of responses to potassium in Western Uruguay - Results field trials 2007/08

2007

Respuesta a la fertilizacion potasica en maiz para grano en suelos del noroeste de Uruguay

2007

Project Description


Visitors at La Manera long-term experiment

Project Leader

Monica Barbazan, Universidad de la República
Oswaldo Ernst, Universidad de la República


Project Cooperators

Martin Bordoli, FAGRO
Oswaldo Ernst, FAGRO
Esteban Hoffman, FAGRO
Andres Quincke, INIA
Agustin Nuñez, INIA
Sebastian Mazzilli, FAGRO
Javier Coitiño, FAGRO


IPNI Staff

F. Garcia


Location

Americas \ South America \ URY \ Soriano

Americas \ South America \ URY \ Rio Negro

Americas \ South America \ URY \ Paysandu


Topics

4r rate, 4r source, nutrient deficiency, nutrient management

barley, maize, soybean, wheat

Potassium (K)