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Hamlin' sweet orange trees on 'Carrizo' citrange and 'Swingle' citrumelo root- stocks were treated weekly with a commercial extract of the brown seaweed Ascophyllum nodosum at 5 and 10 mLL -1 as either a soil drench or foliar spray. Half of the trees in each treatment were subjected to drought stress (irrigated at 50% of evapotranspiration (ET)), whereas the other half remained fully irrigated (100% ET). Drought stress re- duced shoot growth and leaf photosynthesis but increased root and total plant growth relative to the amount of water applied, thus increasing whole plant water use efficiency. Trees treated with seaweed extract and drought-stressed had significantly more total growth than untreated drought-stressed trees for both rootstocks. The maintenance of growth by the seaweed extract under drought stress conditions was unrelated to pho- tosynthesis. However, the seaweed extract treatment did have a significant effect on plant water relations. Soil drench-treated trees had more growth and higher stem water po- tential than foliar-treated or control trees after 8 weeks of drought stress. These results indicate that seaweed extract may be a useful tool for improving drought stress tolerance of container-grown citrus trees.

hortscience

Applications of a Commercial Extract of the Brown Seaweed Ascophyllum nodosum Increases Drought Tolerance in Container-grown ‘Hamlin’ Sweet Orange Nursery Trees