Abstract
Rehabilitation of post-mining limestone soils is often a challenge due to a lack of nutrients and poor soil humus. The research aims to study the effect of various ameliorants on soil chemical properties, growth, and P uptake of gaharu plant (Aquilaria malaccensis) in post-mining limestone soil for revegetation of critical land. The research was conducted in a Completely Randomized Design with three replications. The treatments were P0 (Control, without ameliorant); P1 (Humic Acid, HA, 4 kg ha-1 ); P2 (Phosphate Rocks, PR, 350 kg ha-1 ); P3 (Vesicular Arbuscular Mycorrhizal Fungi, AMF, 500 spores plant-1 ); P4 (HA+AMF); P5 (PR+AMF); and P6 (HA+PR+AMF). Data were analyzed using ANOVA at 95% confidence level and continued with the LSD test. The use of various types of ameliorants (HA, RP, and AMF) significantly increased root length, root volume, wet and dry weight of roots, shoot wet and dry weight, and P uptake of gaharu tree. The best ameliorant in increasing gaharu tree growth was AMF (P3) treatment, and AMF combined with HA (P4) treatment. Thus, for revegetation of critical land, especially post-mining limestone land, using gaharu tree requires HA and AMF inoculation.
Highlights
Gaharu is a local plant and many distributed in Lampung, Sumatra
This research uses Aquilaria malaccensis, which is widespread in Sumatra, assuming that this species is still in the same ecoregion as the research location so that genetically and environmentally, these species will be easier to develop in the research location
The treatments were a combination of ameliorants, namely P0; P1 (Humic Acid, humic acid (HA)); P2 (Rock Phosphate, rock phosphates (RP)); P3 (Vesicular Arbuscular Mycorrhizal Fungi, arbuscular mycorrhizal fungi (AMF)); P4; P5; and P6
Summary
Gaharu is a local plant and many distributed in Lampung, Sumatra. According to the IUCN Red List (2020), gaharu is one of the rare types of plants with CR (Critically Endangered) status. Gaharu is categorized as a critical plant due to overexploitation and conversion of its natural habitat. Gaharu cultivation and reintroduction are crucial to do immediately so that this species does not become extinct. There are about 27 species of gaharu scattered in Indonesia, but the ones that grow and develop in Sumatra are Aquilaria malaccensis, Aquilaria microcarpa, and Grynops sp. This research uses Aquilaria malaccensis, which is widespread in Sumatra, assuming that this species is still in the same ecoregion as the research location so that genetically and environmentally, these species will be easier to develop in the research location. Based on Law Number 32 of 2009 concerning the protection and management of the environment, an ecoregion is a geographical area that has the same
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