Journal of
Soil Science and Environmental Management

  • Abbreviation: J. Soil Sci. Environ. Manage.
  • Language: English
  • ISSN: 2141-2391
  • DOI: 10.5897/JSSEM
  • Start Year: 2010
  • Published Articles: 311

Full Length Research Paper

Kinetic of pigs’ manures decomposition and nutrient release pattern in ferralitic soil of Benin (West Africa)

Aliou Saidou
  • Aliou Saidou
  • Integrated Soil and Crop Management Unit (ISCM), Laboratory of Soil Sciences, Department of Crop Science, Faculty of Agronomic Science, University of Abomey-Calavi, Benin.03 BP 2819 Jéricho Cotonou.
  • Google Scholar
Herve Kouessivi Janvier Bokossa
  • Herve Kouessivi Janvier Bokossa
  • Laboratory of Research on Wetlands (LRW), Department of Zoology, Faculty of Science and Technique, University of Abomey-Calavi, Benin. BP 526 Cotonou.
  • Google Scholar
Emile Didier Fiogbe
  • Emile Didier Fiogbe
  • Integrated Soil and Crop Management Unit (ISCM), Laboratory of Soil Sciences, Department of Crop Science, Faculty of Agronomic Science, University of Abomey-Calavi, Benin.03 BP 2819 Jéricho Cotonou.
  • Google Scholar
Dansou Kossou
  • Dansou Kossou
  • Laboratory of Plant Biology, Department of Crop Science, Faculty of Agronomic Science, University of Abomey-Calavi, Benin03 BP 2819 Jéricho Cotonou.
  • Google Scholar


  •  Received: 27 November 2015
  •  Accepted: 15 March 2016
  •  Published: 30 June 2016

Abstract

Our study aims to assess the kinetic of the decomposition and nutrient mineralization process of organic manures from pigs’ dejection. A litter bag study was carried out during 12 weeks following decomposition and nutrient release process in ferralitic soil in southern Benin (West Africa). 200 g of pigs’ manures from four groups of pigs fed with four diets were considered as treatments: T1 (recommended diet composition, consisted of 15% Azolla pinnata + 55% provender + 5% coconut copra + 5% oil palm + 5% soybean bran + 10% rice bran + 5% kitchen waste), T2 (partially improved diet with Azolla pinnata, consisted of 30% Azolla pinnata + 65% rice bran + 5% oil palm), T3 (improved diet with Azolla pinnata, consisted of 47.5% Azolla pinnata + 47.5% rice bran + 5% oil palm), and T4 (improved diet with cereal bran, consisted of 15% Azolla pinnata + 40% rice bran + 40% wheat bran + 5% oil palm). Animals of six months age were fed during three months. A randomized complete block design with three replicates was set up for litter bag study. One component exponential decomposition model y = y0e-kt was found for all treatments. Nutrient mineralization was slow in the soil. Less than 50% of the pigs’ manures were decomposed after 12 weeks. In addition, manure from treatment T1 was richer in K, Ca and Mg than manures from treatment T3. High quantity (42.65%) of N was released in treatment T3.  Pigs fed with diet enriched with Azolla produce manure which has released high N proportion in the soil. This is an opportunity to sustain food crop production.

 

Key words: Pigs’ diet composition, Azolla pinnata, soil fertility, organic manure, decomposition rate.