Seaweed compost for agricultural crop production

作者：Cole Andrew J^*; Roberts David A; Garside Alan L; de Nys Rocky; Paul Nicholas A

来源：Journal of Applied Phycology, 2016, 28(1): 629-642.

DOI：10.1007/s10811-015-0544-2

• Macroalgae
• Phosphorous
• Nitrogen
• Agriculture
• Salt
• Electrical conductivity

This study manipulated the carbon-to-nitrogen ratio (C:N) of seaweed composts by varying the proportion of high N green seaweed (Ulva ohnoi) and high C sugarcane bagasse to assess their quality and suitability for use in agricultural crop production. Seaweed-bagasse mixes that had an initial C:N ratio greater than 18:1 (up to 50:1) could be transformed into a mature compost within 16 weeks. However, only composts with a high seaweed content and therefore low initial C:N (18 and 22:1) supported a consistently high rate of plant growth, even at low application rates. Sugarcane grown in these high seaweed composts had a 7-fold higher total above-ground biomass than low seaweed composts and a 4-fold higher total above-ground biomass than sugarcane grown in commercial compost that did not contain seaweed. Overall, the optimal initial C:N ratio for seaweed-based compost was 22:1 which corresponds to 82 % seaweed on a fresh weight basis. This ratio will produce a high quality mature compost whilst also ensuring that a high proportion of the nitrogen (> 90 %) in the Ulva biomass is retained through the composting process.

• 出版日期2016-2