A low level of microbial activity in green roof media, may have contributed to the minimal amount of utilizable nutrients released by the organic fertilizers. The organic fertilizers performed poorly because they failed to provide utilizable nutrients in adequate quantities. Also, single applications were better than split application for the organic fertilizers, indicating that sedums use nutrients the most in spring. The best aesthetic quality and growth was for the single application synthetic granular fertilizer, followed by the split application of synthetic granular fertilizer. m‒2 applied as a single spring application or a split application (spring and summer) and a controlled-release fertilizer at the same rate and a no fertilizer control were evaluated.Aesthetic quality and growth of two sedum species (Sedum album and Sedum rupestre ‘Angelina’) treated with synthetic granular fertilizer and two organic fertilizers at 10 g N Fertility is an important aspect of green roof maintenance.
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