Fertilizer value of compost and densified fertilizers made from swine and poultry manures on crops and chemical properties of clay soil

Abstract

© 2018, International Society for Southeast Asian Agricultural Sciences. All rights reserved. The risks associated with animal manure when used as fertilizer are complex in nature and when not handled properly can cause damage to humans and environment. This investigation sought to elucidate the requirements when compost with animal manures are processed into densified fertilizer and assess its fertilizer value. Composting of poultry and swine manures were conducted in the demonstration area of Agricultural Systems Institute (ASI) at U.P. Los Baños, Philippines. Nutrient additives (rice bran, rice ash, soya meal, carbonized rice hull, alumino-silicate material, Gliricidia sepium) were mixed with poultry and swine manures while concurrent vermicomposting was conducted using fresh G. sepium and carabao manure. The composting final by-products were molded into densified fertilizers. The efficacy of these fertilizers was evaluated in pot experiments conducted in sequential cropping from February 03 to May 25, 2014. Corn (Zea mays L.) was planted first followed by bush sitao (Vigna sesquipedalis x Vigna unguiculata) as second crop. The response of crops and changes in the chemical properties of acidic clay soil (Typic Tropudalfs) were examined. The study showed the role of densification technology in the production of organic fertilizers from animal manures. Research findings suggest that the densified manure-based fertilizers with organic additives may be used as alternative to chemical commercial fertilizer when the latter is not available. The form (powder or molded) and chemical constituents of the applied fertilizers affected the crop yield and brought positive changes in the chemical properties (pH and cation exchange capacity) of soil. A longer cropping period is required before significant changes in soil properties can be detected.

Source or Periodical Title

Journal of the International Society for Southeast Asian Agricultural Sciences

ISSN

8593132

Page

43-55

Document Type

Article

Subject

Additives, Compost pathogens, Densification, Pelleted organic fertilizers

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