Tree legume - microbial symbiosis and other soil amendments as rehabilitation strategies in mine tailings in the Philippines

Abstract

© 2019, Department of Science and Technology. All rights reserved. A field experiment was conducted to develop rehabilitation protocols for rehabilitating mine tailings areas using arbuscular mycorrhizal fungi (AMFs) and nitrogen-fixing bacteria (NFBs) as microbial biofertilizers. Narra (Pterocarpus indicus) seedlings were inoculated during pricking with AMF with or without NFB Azospirillum spp. After four months in the nursery, the seedlings were planted in a barren, mined-out area in Barangay Capayang, Mogpog, Marinduque, Philippines. During field planting of narra seedlings, vermicompost and lime were mixed with the excavated soil prior to back-filling the 30 cm3 planting hole. Uninoculated narra seedlings were also planted without any amendments, thus serving as the negative control. After one year, 96% (control) and 99% (AMF±NFB) seedling survival were observed with amendments as compared to only 50% in the negative control. The negative control had height and stem diameter of 2.2x and 1.65x, respectively - lower than the control with no biofertilizer but with soil amendments. With soil amendments, mycorrhizal seedlings gave height increases ranging from 98 to 139% and stem diameter from 67 to 87% relative to the uninoculated plants. Mycorrhizal inoculation gave the highest (418 cm3) wood volume while the lowest was the control (50 cm3). The results clearly showed the beneficial effects of microbial biofertilizers and soil amendments for the rehabilitation of mined-out area in Mogpog and could have potential applications for rehabilitation of other mined out areas with similar conditions.

Source or Periodical Title

Philippine Journal of Science

ISSN

317683

Page

481-491

Document Type

Article

Subject

Mycorrhizal inoculants, MYKOVAM®, Narra, Nitrogen-fixing bacteria, Pterocarpus indicus

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