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Isolation, trapping, and application of arbuscular mycorrhizal fungi to increase of phosphorus efficiency, growth, and productivity of soybean under saturated soil culture on acid sulphate soil

Ghulamahdi Munif, Melati Maya, Purwono, Mansur Irdika, Muis Ridwan, Haitami A., Shiraiwa Tatsuhiko, Taylor Paul

Journal of Ecological Engineering

2025

Vol. 26, nr 1

1--13

This study investigated the effects of arbuscular mycorrhizal fungi (AMF) inoculation and varying phosphorus (P)doses on two soybean cultivars (Tanggamus and Anjasmoro) under saturated soil culture and dry culture conditions in acid sulfate tidal soils. The experiment, conducted in Jambi Province, Indonesia, from May to August 2019, employed a split-split plot design with three factors: AMF inoculation, soybean variety, and phosphorus fertilizer application rates (0, 36, 72, and 108 kg P2O5 ha-1). Results showed that AMF inoculation of the Tanggamus variety at 36 kg P2O5 ha-1improved soil available phosphorus, plant P uptake and content, P uptake efficiency, inoculant relative efficiency, stem diameter, and branch count. This combination also enhanced stover dry weight, accelerated flowering, and harvest age, reduced empty pod count, and improved P use efficiency. The Tanggamus variety at 36 kg P2O5 ha-1demonstrated improvements in growth parameters and P-related efficiencies. AMF inoculation at 36 kg P2O5 ha-1 positively impacted multiple soil and plant characteristics, including available P, Puptake and content, potassium uptake, and various efficiency measures. It also improved yield components such as pod count, 100-seed weight, and seed weight per plot and hectare. Notably, soybean yield in saturated soil culture surpassed that in dry culture, suggesting the potential of this method for addressing challenges in acid-sulfate tidal soils, particularly those with limited P availability and pyrite layers.

Effects of Root Pruning on Organic Carbon Stock Levels in Oil Palm Plantation

Hariyadi, Wahyudin Cecep Ijang, Sudradjat, Yahya Sudirman, Anwar Syaiful, Herwitarahman, Adwiyani P., Haitami A.

Journal of Ecological Engineering

2024

Vol. 25, nr 12

194--201

Palm oil (Elaeis guineensis Jacq.) is a crop that can transfer carbon dioxide into carbon storage within the soil. Root pruning also plays a role in enhancing carbon stocks in the plant. This research aims to evaluate the effects of root pruning on oil palm carbon reserves and their association with nutrient absorption. The study was conducted over six months using four-year-old oil palm plants. A nested experimental design with two factors was employed. The first factor, serving as the main plot, involved three root cutting depths (0, 10, and 20 cm), while the second factor consisted of four root cutting intensities (0%, 25%, 50%, and 75%). The findings indicated that root pruning increased the plant’s carbon stock, though it remained lower compared to the control. The highest CO2 emission was recorded in the afternoon, specifically in the 20 cm root cutting treatment at 75% intensity, measuring 4.3 μmol·m-2 sec-1. The greatest carbon reserve, 16.98 tons·C·ha-1 year-1, was observed at a 20 cm depth and 75% intensity, with a positive correlation.