Sustainability in terms of nutrient elements with special reference to West - Africa

Abstract

PRODUCTION 4.1 Introduction 51 4.1.1The Fifth Region and the Cercle de Niafunk 51 4.2 Methodology (with F.R. Veeneklaas) 53 4.2.1 General framework and definitions 53 4.2.2Description of various relations 54 4.2.3Sustainability 55 4.2.4Subsistence needs 4.2.5 Constraints 56 4.2.6 Goals 56 4.2.7 Scenarios 58 4.3 Basic data 4.3.1 Cropping systems 4.3.2Livestock 62 4.4 Scenario definition 4.5 Results 66 4.5.1 Highlights 66 4.5.2Land use and crop production 67 4.5.3Inorganic fertilizer and farmyard manure requirements . .72 4.5.4Animal husbandry 4.6 Scenario variants and post-model analysis 75 4.6.1 Emigration rate 4.6.2Population growth 4.6.3Fertilizer availability 4.6.4Uneven distribution of costs and profits 4.6.5 Possible steps for further analysis 77 4.7 Concluding remarks PART B. DETAILED PLANT DATA 5. MILLET 5.1 Dry matter distribution 81 5.2 Concentration of major elements 83 5.3 Three quandrant figures 87 5.3.1 Nitrogen 87 5.3.2Phosphorus .91 5.3.3Potassium 95 5.4 Nutrient content as related to yield 5.5 Ratio phosphorus content to nitrogen content 5.6 Relations among relative post-anthesis nutrient uptake values of N, P and K 5.7 Nutrient harvest indices 105 6. SORGHUM 6.1 Dry matter distribution 107 6.2 Concentration of major elements 109 6.3 Three quandrant figures 6.3.1 Nitrogen 6.3.2Phosphorus 6.4 Nutrient content as related to yield 118 6.5 Ratio phosphorus content to nitrogen content 122 6.6 Relations among relative post-anthesis nutrient uptake values of N, PandK REFERENCES 233 ANNEXES Al.Recovery fractions al A2.Nutrient concentrations in farmyard manure al9 A3.