Background and aims

Soil acidification impedes crop growth. Seed pelletization was used to improve crop resistance to various stress environments but not acidic soil. This study aimed to develop rapeseed seed pelletization and to assess the promotional effects of pelletization on rapeseed growth under acidic conditions.

Methods

Two main acid-resistant functional agents (Ca(OH)₂, and biochar) and a basic formula including sodium carboxymethyl cellulose, H₃BO₃, nano-silica, brassinolide, sodium naphthalene acetate, indoleacetic acid, and yeast metabolite were used to evaluate the effects on rapeseed growth by seed pelletization. Then, the mechanism of alleviating acidic stress by seed pelletization was investigated.

Results

A basic formula were developed by soil test. Three acid-resistant seed pelletization cases (① 0.5% Ca(OH)₂ + a basic formula; ② 10% biochar + a basic formula; ③ 0.25% Ca(OH)₂ + 5% biochar + a basic formula) were confirmed to have significant plant growth promotion. Compared to the unpelletized treatment, seed pelletization significantly increased root length and dry weight of rapeseed seedling by 67.32%-78.34% and 46.47%-74.12%, respectively. It also increased nutrient uptake and reduced the accumulation of toxic Al by 11.72%-16.23% in rapeseed roots. Moreover, seed pelletization modulated the local soil environment at the sowing site, increased soil pH by 0.88–1.11 in the microzone, thereby reducing the adverse effects of acidic stress.

Conclusion

Seed pelletization in rapeseed can enhance its tolerance to acidic stress and promote plant growth. Additionally, our results provide new insights into the strategies to alleviate the inhibitory effects of acidic soil.

中文翻译：

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耐酸种子丸化配方的研制及其对酸性土壤油菜生长的促进作用

背景和目标

土壤酸化阻碍作物生长。种子造粒可提高作物对各种胁迫环境的抵抗力，但不能提高对酸性土壤的抵抗力。本研究旨在开发油菜籽颗粒化技术，并评估酸性条件下颗粒化对油菜籽生长的促进作用。

方法

采用两种主要的耐酸功能剂（Ca(OH) _{2和生物炭）和包括羧甲基纤维素钠、H 3} BO ₃ 、纳米二氧化硅、芸苔素内酯、萘乙酸钠、吲哚乙酸和酵母代谢物在内的基本配方，评估种子颗粒化对油菜籽生长的影响。然后，研究了种子颗粒化减轻酸性胁迫的机制。

结果

通过土壤测试制定了基本公式。三个耐酸种子颗粒化案例（①0.5%Ca(OH) ₂₊ 一个基本配方；②10%生物炭+一个基本配方；③0.25%Ca(OH) ₂  +5%生物炭+一个基本配方）被证实有显着的植物生长促进作用。与未制粒处理相比，种子制丸处理使油菜幼苗的根长和干重分别显着增加了67.32%-78.34%和46.47%-74.12%。还能增加油菜根部养分吸收，减少有毒铝的积累11.72%-16.23%。此外，种子颗粒化调节了播种地局部土壤环境，使微区土壤pH值提高了0.88-1.11，从而减少了酸性胁迫的不利影响。

结论

油菜籽粒化可以增强其对酸性胁迫的耐受性，促进植物生长。此外，我们的结果为减轻酸性土壤抑制作用的策略提供了新的见解。