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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Presentation transcript:

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

WEST AFRICAN SOILS CONSTRAINTS P and N deficiencies

POTASSIUM (K) DEFICIENCY SM-CRSP Source ADSC UH POTASSIUM (K) DEFICIENCY Preliminary results of Nioro-Senegal Number of sample farmers Means exchangeable K mg/kg 52 A.N’diaye 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 C. Ba 3.7

POTASSIUM (K) DEFICIENCY 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

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

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

METHODOLOGY Soil analysis Incubation Soil collection : Cinzana Landform (Toposequence) SM-CRSP IFS IER Soil label CZ1 CZ2 CZ3 CZ4 Soil analysis Incubation CZ5

RESULTS AND DISCUSSION SM-CRSP IFS IER RESULTS AND DISCUSSION

Malian soils results Soil Name Mineralozy Texture (%) Clay sand Loam Cinzana 1 Quartz, kaolinite 4 92 Cinzana 2 3 93 Cinzana 3 5 88 7 Cinzana 4 14 81 Cinzana 5 36 54 10 SM-CRSP IFS IER

Soil pH Cinzana Topsoil SM-CRSP IFS IER

Extractable and Exchangeable K (mg/kg) Cinzana Topsoil SM-CRSP IFS IER

Total and Extractable K (mg/kg) Cinzana Topsoil, Mali SM-CRSP IFS IER

INCUBATION RESULTS SM-CRSP IFS IER

CONCLUSION Future research K Buffer coefficient SM-CRSP IFS IER CONCLUSION Potassium levels are low Future research K Buffer coefficient Development of a potassium (K) module

THANKS SM-CRSP Soil Management Collaborative Research Support Program 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