Abstract
The rainfall of agricultural areas of the West African semi-arid tropics varies from 300 to 1200 mm. Although in absolute terms rainfall is low only in the northern half of the desert margins, the high inter-annual variability associated with eratic distribution of rainfall both in location and during the growing season, constitute major limitations for agricultural production. Continuous and intensive cropping without restoration of the soil fertility has depleted the nutrient base of most of the soils. For many cropping systems in the region, nutrient balances are negative, indicating soil mining. Among soil fertility factors, phosphorus (P) deficiency is a major constraint to crop production. Phosphorus use efficiency (PUE) as defined as yield increase per kg fertilizer P added, is related to P sources, environmental factors, soil, and crop management. In addition to water-soluble P-fertilizers, the effect of rock phosphate (PR) sources from Niger (Parc-W PR and Tahoua PR), Mali (Tilemsi PR), and Burkina Faso (Kodjari PR) and modified partially acidulated phosphate rocks (PAPR) on P-use efficiency is reported. PAPR improved the PUE of all PR sources. Among the four PR sources in the region, Tahoua PR (TPR) recorded the highest PUE as compared to Kodjari (KPR) or Parc-W (PRW). It is concluded that rainfall received in September at grain filling and maturation stage was best correlated to PUE. There are large differences in the PUEs of different pearl millet cultivars, and values varied from 25 to 77 kg grain (kg P ha)−1. Hill placement of 4 kg P ha−1 at sowing time improved PUE more than the present recommendation of 13 kg ha−1 broadcast, and also improved the efficiency of PAPR. The rotation of cereals and cowpea, and soil amendment with crop residue application drastically increased PUE in the region.
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Bationo, A., Kumar, K.A. (2002). Phosphorus use efficiency as related to sources of P fertilizers, rainfall, soil, crop management, and genotypes in the West African semi-arid tropics. In: Adu-Gyamfi, J.J. (eds) Food Security in Nutrient-Stressed Environments: Exploiting Plants’ Genetic Capabilities. Developments in Plant and Soil Sciences, vol 95. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1570-6_16
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DOI: https://doi.org/10.1007/978-94-017-1570-6_16
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