Fertilization of millet cv. Souna III in Senegal: dry matter production and nutrient uptake |
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Authors: | N van Duivenbooden L Cissé |
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Affiliation: | (1) Centre for Agrobiological Research (CABO-DLO), P.O. Box 14, 6700 AA Wageningen, The Netherlands;(2) Institut Sénégalais de Recherches Agricoles (ISRA), CNRA Bambey, P.O. Box 53, Bambey, Senegal;(3) Present address: Department of Agronomy, Wageningen Agricultural University, P.O. Box 341, 6700 AH Wageningen, The Netherlands |
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Abstract: | In a fertilizer and manure experiment, millet was grown under four treatments (no fertilizer or manure, farmyard manure, chemical fertilizer, and both). Grain yield and total aboveground biomass production of the unfertilized plot were relatively high. The observed differences in total dry matter production must be attributed to differences in nutrient availability, as amount of rainfall and its distribution were favourable. Results show only small differences in distribution of dry matter among the various plant organs between the best and the non-fertilized treatments.Nutrient supply from natural sources, defined as crop content of N, P, and K at maturity without fertilizer application, amounted to 104, 16 and 103 kg ha–1, respectively, which are very high values.Total uptake of calcium and magnesium is related to that of potassium, as the combined content of these three elements is linearly related to total aboveground biomass production. Minimum removal of nitrogen and phosphorus per ton grain dry matter amounts to 29 and 4kg, respectively, and 9 kg potassium per ton total aboveground dry matter. A possible double function of phosphorus as element of structural biomass and for maintenance of electro-neutrality is discussed. |
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Keywords: | calcium dry matter distribution fertilizer harvest index magnesium manure millet nitrogen nutrient uptake phosphorus potassium Senegal |
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