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This article in AJ

  1. Vol. 85 No. 4, p. 862-866
     
    Received: June 26, 1992
    Published: July, 1993


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doi:10.2134/agronj1993.00021962008500040016x

Nutrient and Structural Carbohydrate Partitioning in Pearl Millet

  1. J. M. Powell  and
  2. L. K. Fussell
  1. I nt. Livestock Centre for Africa (ILCA), B.P. 12404, Niamey, Niger
    f ormerly with International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), ICRISAT Sahelian Center, Niamey, Niger

Abstract

Abstract

Cereal stovers and other crop residues are vital feeds for ruminants during the 6- to 8-mo dry season in mixed farming systems of semiarid West Africa. Reducing the competition between livestock and soil fertility is crucial to the sustained productivity of these farming systems. A 2-yr field study was conducted in Niger on a sandy siliceous isohyperthermic Psammentic Paleustalf to determine the effects of fertilizer N (15 and 45 kg ha−1) and P (4.4 and 17.4 kg ha−1) on dry matter (DM), N, P, and structural carbohydrate distribution in plant parts of pearl millet [Pennisetum glaucum (L.) R. Br.]. Fertilizer N increased total millet DM by 13%, N uptake by 63%, and P uptake by 29%. Fertilizer P increased total millet DM by 100%, N uptake by 80%, and P uptake by 140%. Fertilizer N increased millet grain yield only during the year of adequate rainfall, whereas fertilizer P increased yields during both years. Fertilizer N increased and fertilizer P decreased the N concentrations in millet stover. Fertilizer P increased the P concentrations in all upper plant parts. The average total millet DM of 2.75 Mg ha−1 was partitioned into grain (18%); animal feed consisting of chaff, immature panicles, upper stover and tillers (41%); and middle and lower stover components for soil conservation (41%). Partitioning was not affected by fertilizer addition. Of the total N (33.4 kg ha−1) and P (5.2 kg ha−1) uptake, 32 and 40% were contained in grain, 41 and 40% in animal feed, and 27 and 20% in components for soil conservation. Results of our study show the importance of N and especially P in increasing grain and forage yield and quality, and that stover can be managed more effectively to raise both crops and livestock in a more sustainable manner.

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