生长调节剂吲哚丁酸对移栽棉苗成活及生长发育的影响

doi:10.3724/SP.J.1006.2025.54042

Abstract

Abstract:

The cotton substrate-based simplified seedling raising technology can significantly reduce labor intensity. However, its widespread adoption is limited by the substrate’s poor water retention capacity after transplanting, which often results in low seedling survival rates and prolonged recovery periods. To identify effective strategies for improving the survival and early growth of transplanted cotton seedlings, this study used Sikang 3 as the experimental material and investigated the effects of foliar application of indolebutyric acid (IBA) at various concentrations (0, 20, 40, 60, 80, and 100 mg L^?¹) during the 1-leaf-1-heart stage from 2022 to 2024. The results indicated that a concentration of 20 mg L^?¹ (E1) was optimal for enhancing seedling survival and growth. Compared to the control (water spray, CK), E1 treatment significantly increased the survival rate of transplanted seedlings to approximately 99.0% and shortened the recovery period by 2–3 days. Fifteen days after transplanting, root mass per plant increased by 15.3%–19.5%, root active surface area by 7.0%–10.6%, and plant height by 13.1%–31.6%. Additionally, E1 treatment significantly promoted the uptake and accumulation of nitrogen, phosphorus, and potassium by 19.6%–22.1%, 7.2%–34.2%, and 22.1%–31.3%, respectively. At the boll opening stage, the dry weights of vegetative and reproductive organs increased by 4.4%–5.9% and 8.5%–10.0%, respectively, leading to a final lint yield increase of 8.5%–10.0%. Therefore, foliar application of 20 mg L^?¹ IBA at the 1-leaf-1-heart stage is an effective approach to ensure near-100% survival of transplanted cotton seedlings, significantly shorten the recovery period, accelerate root system development and plant growth, enhance nutrient absorption, and ultimately improve yield. This technique provides essential technical support for the efficient and stable implementation of simplified cotton seedling raising and transplanting.

Key words: cotton, substrate cultivation and transplanting, IBA, survive after planting, growth and development

DING Jun-Feng, XU Ying-Fei, ZHANG Xiang, CHEN Yuan, CHEN De-Hua. Effects of the plant growth regulator IBA on the survival and growth of substrate-grown transplanted cotton seedlings[J].Acta Agronomica Sinica, 2025, 51(12): 3331-3341.

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Effects of the plant growth regulator IBA on the survival and growth of substrate-grown transplanted cotton seedlings

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