Presentation on theme: "On solid ground Prem S. Bindraban Director ISRIC – World Soil Information Senior Researcher – Agrosystems Research Wageningen UR 3rd Conference on Sustainable."— Presentation transcript:
On solid ground Prem S. Bindraban Director ISRIC – World Soil Information Senior Researcher – Agrosystems Research Wageningen UR 3rd Conference on Sustainable Agriculture: The Art of Farming - Innovative Solutions for a Sustainable Mainstream Agriculture SAI, Brussels, 11 May 2010
Soil productivity (Living organisms)? Decomposition Improves soil structure Texture Sand Silt Clay Soil Organic Matter Nutrients (Source, CEC) Soil structure (pores) Water holding capacity Infiltration Erosion Land with appropriate soil characteristics Functional role difficult to assess Loss of biodiversity and SOM due to land clearing
Functionality –Important characteristics Cation-Exchange Capacity = f(SOM, Clay) (r 2 > 0.8) Permanent Wilting Point = f(SOM, Clay) (r 2 > 0.8) e.g. Bell and van Keulen, 1995. Soil Sci.Soc. Am. J. 59: 865-871
Deteriorating soils Marcel Galiba 11-15 kg N/ha Nutrient depletion No data Low Moderate High Very high 1 ton grain Stoorvogel et al.
Fertilizing the Sahel Cereal yields limited by available soil nutrient (- nutrients) Cereal yields limited by available (rain) water (+ nutrients) (Bindraban et al., 1999) Bindraban et al., 1999
Zingore, et al., Europ J. Soil Sci 56: 727-736 Soil Carbon loss Extraction of residues from soils detrimental to soil fertility
Nutrient interactions Different rates of N with (solid symbols) and without P (open symbols) on a smallholder homeﬁeld (circles) and outﬁeld (triangles) on a sandy granitic soil (Zingore et al., 2007, 2008)
Interactions with weather Yield response of maize varying with annual rainfall patterns at 3 levels of fertilizer application (0, 17 and 52 kg N/ha) (source: Twomlow, Mugabe et al. 2008)
Managing and improving soils is complex (field) Rainfall Irrigation Fertilizatio n Weeds, pests, diseases Productio n Water management Nutrient management Short and long term Risk Nutrient mining Variability Erosion Infestation
Site specific management of soils – essential to maintain soil quality
Creating a financial and institutional mechanism in water management services that supports rural livelihoods Payment of Environmental Services Green Water Credits
wet year Erosion in dry year wet year Blue Water in dry year
Soils – provides solid ground for global development issues Climate change Food production Input requirement (N, P, K, H 2 O, …) Degradation De- / Re-forestation (REDD) Bio-energy Marginal lands (micro nutrients, toxicity, salinity, acidity, …) … Good world soil data ?
Soil depth GlobalSoilMap.net approach We need your help !! And you may need us.
Questions? Prem.Bindraban@wur.nl Prem.Bindraban@wur.nl Director ISRIC – World Soil Information Agrosystems Research – Wageningen UR