Effects of carbon-based amendments on rhizosphere soil nutrient content and cotton growth at the flowering-boll stage in saline soil

doi:10.14088/j.cnki.issn0439-8114.2026.10.010

Abstract

Abstract: Aiming at the problems of inhibited cotton growth and low yield caused by low soil nutrient retention capacity in saline cotton fields, saline soil and cotton were taken as research materials. Eight treatments were set, including control (CK), biochar (BC), organic fertilizer (OF), combined application of biochar and organic fertilizer (BOF), oxalic acid (OA), glucose (GLU), and two combined treatments of oxalic acid and glucose (OG1, OG2). The regulatory effects of different amendment measures on rhizosphere soil nutrient content, root physiological characteristics, root architecture, and yield of cotton at the flowering-boll stage were systematically evaluated. The results showed that compared with CK, BC exhibited the most significant improvement in rhizosphere soil organic carbon, while OF stably increased soil nitrogen and potassium contents. The BOF treatment achieved the best comprehensive effects in improving available phosphorus, available potassium, total nitrogen and total potassium contents. In terms of plant growth, BC, OF and BOF significantly promoted plant height, stem diameter, leaf SPAD value, above-ground dry matter accumulation and root development of cotton, and greatly enhanced root antioxidant capacity, with BOF showing the optimal effect. All treatments significantly increased plant number, boll number and yield of cotton, and BOF had the best improvement effect, followed by BC and OF. In conclusion, the application of carbon-based amendments could improve rhizosphere soil nutrient status, enhance root antioxidant enzyme activity, promote root development, and ultimately increase cotton yield under saline soil conditions.

Key words: saline soil, carbon-based amendments, cotton, rhizosphere soil nutrient content, growth

CLC Number:

S562
S156.2

ZHENG Shu-hui, WANG Yao-feng, LI Ai-sha, ZHOU Yu-chao, Ainiguli Yiming. Effects of carbon-based amendments on rhizosphere soil nutrient content and cotton growth at the flowering-boll stage in saline soil[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(10): 68-76.

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