Green Biostimulant from Hydrolysis of Kappaphycus alvarezii Seaweed for Growth and Crop Yield Improvement of Hybrid Maize

In this project, a seaweed extract-based biostimulants that are rich in oligocarrageenans (OCs) was introduced. It was produced via direct hydrolysis of <em>Kappaphycus averazii</em> biomass in ascorbic acid. Two hydrolysates products, contains OCs with distinct molecular weight varied by different reaction time, were foliar sprayed on maize field at different dosages; and the optimal treatment gave significant increases in the plant nutrient uptakes, plant height (by ~20.6%), and grain yield (by ~21%) over the control. We consider the possibility of hydrolysates usage as an effective biostimulant to reduce fertilizers in agriculture. The project was granted by The Tay Nguyen 3 Program which is a national Science and Technology program for Tay Nguyen socio – economic development (2011 – 2015) (http://www.vast.ac.vn/en/science-and-technology-research-projects?start=400?option=com_detai&amp;view=detai&amp;id=1078)本项目开发了一种富含寡聚卡拉胶（oligocarrageenans, OCs）的海藻提取物类生物刺激素。该产物通过在抗坏血酸体系中直接水解卡帕藻（Kappaphycus averazii）生物质制备得到。通过调控反应时长，获得两种含有不同分子量寡聚卡拉胶的水解产物，并以不同施用量对玉米田开展叶面喷施处理。结果表明，最优处理组的植株养分吸收量、株高（提升约20.6%）及籽粒产量（提升约21%）均显著优于对照组。本研究认为该水解产物可作为高效生物刺激素，用于农业生产中减少化肥施用量。本项目获西原3号计划资助，该计划是面向西原地区社会经济发展的国家科技计划（2011-2015年），相关链接：http://www.vast.ac.vn/en/science-and-technology-research-projects?start=400?option=com_detai&view=detai&id=1078