Influence of biochar and aluminum sulfate on rice growth and production in saline soil

Abstract

ABSTRACT Soil salinization is a major threat to crop production. Biochar and aluminum sulfate as soil amendments are critical for improving rice (Oryza sativa L.) productivity under saline-sodic conditions. This study explored the effects of rice-husk biochar and aluminum sulfate on rice growth, biomass, yield, and soil properties under saline-sodic conditions. The experiment was carried out in an experimental field located at the Jilin Agricultural University, China. Five treatments, viz., T0 (no biochar, no aluminum sulfate, no nitrogen), T1 (no biochar, no aluminum sulfate, with NPK), T2 (aluminum sulfate and NPK), T3 (biochar and NPK), and T4 (biochar, aluminum sulfate, and NPK), arranged in a completely randomized design with five biological replicates, were assessed. Compared to T0, plant height, tiller number, leaf dry weight, panicle dry weight, sheath dry weight, stem dry weight, and total dry biomass significantly increased by 14.67%, 56.39%, 60.13%, 59.53%, 39.00%, 58.36%, and 55.99%, respectively, with T1. Compared to T0, the grain yield significantly increased by 82.79% with T1. Additionally, biochar and aluminum sulfate applications significantly decreased the Na+ concentration in different rice organs and considerably increased the K+ concentration and consequently, the K+/Na+ ratio. Moreover, compared to the control, the soil pH, Ca2+, Mg2+, CO32-, and Cl- concentrations under T1, T2, T3, and T4 treatments were substantially improved. Therefore, biochar and aluminum sulfate applications can alleviate saline-sodic stress, improve soil health, and increase rice productivity on saline-sodic soils. The study findings are anticipated to help develop new management strategies for improving rice production under saline-sodic conditions.