SM-CRSP

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SM-CRSP IFS IER
Development of a Potassium (K) module to be
incorporated into Nutrient Management Support
System for major West African soils
Adama BAGAYOKO
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WEST AFRICAN SOILS CONSTRAINTS
P and N deficiencies

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SM-CRSP Source ADSC UH
POTASSIUM (K) DEFICIENCY
Preliminary results of Nioro-Senegal
Number of sample farmers Means exchangeable K mg/kg
52 A.Ndiaye 10.6
48 T. Sene 7.0
50 O. kane 2.6
60 C .Wilane 0.1
56 A. Toure 7.5
46 M. Diabo 8.8
50 C. Ba 3.7
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Source LaboSEP IER
POTASSIUM (K) DEFICIENCY
Preliminary results cotton zone in Mali
Figure1. Spatial distribution of exchangeable K
in cotton zones in Mali
Figure 2. Name of site cotton zones in Mali
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HYPOTHESIS The continuous cropping systems,
without K fertilization deplete the K reserve of
most West African soils. Therefore, K
applications on these soils become necessary to
increase soil nutrient status and sustain or
increase crop yields.
SM-CRSP IFS IER
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OBJECTIVES

• The overall objective is to develop K specific
  recommendations for key stable food crops in West
  Africa
• Specifics objectives
• To develop and compare a K module to accurately
  predict K fertilizer requirements,
• 2. To determine economic benefit.

SM-CRSP IFS IER
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METHODOLOGY

• Soil collection Cinzana Landform
  (Toposequence)

SM-CRSP IFS IER
CZ1
Soil label
CZ2
CZ3
CZ4
CZ5

• Soil analysis
• Incubation

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SM-CRSP IFS IER
RESULTS AND DISCUSSION
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Malian soils results
Soil Name Mineralozy Texture () Texture () Texture ()
Soil Name Mineralozy Clay sand Loam
Cinzana 1 Quartz, kaolinite 4 92 4
Cinzana 2 Quartz, kaolinite 3 93 4
Cinzana 3 Quartz, kaolinite 5 88 7
Cinzana 4 Quartz, kaolinite 14 81 5
Cinzana 5 Quartz, kaolinite 36 54 10
SM-CRSP IFS IER
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Soil pH Cinzana Topsoil
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Extractable and Exchangeable K (mg/kg) Cinzana
Topsoil
SM-CRSP IFS IER
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Total and Extractable K (mg/kg) Cinzana Topsoil,
Mali
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INCUBATION RESULTS
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SM-CRSP IFS IER
CONCLUSION

• Potassium levels are low

Future research

• K Buffer coefficient
• Development of a potassium (K) module

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Sponsors
THANKS
SM-CRSP Soil Management Collaborative Research
Support Program
TPSS Department of Tropical Plant and Soil
Science University Hawaii at Manoa
IFS International Foundation for Science, Sweden