Compost and rootstock effects on fibrous root physiology and bacterial community composition in young citrus trees under endemic Huanglongbing.
Pugina G, Tardivo C, Monus B, Dawson E, Strauss SL
Soil Health
Florida orange groves are disappearing faster than most people realize, and even the best soil-building practices can't save trees once a disease rewires their basic physiology — a humbling reminder that some problems run deeper than what you can fix from the ground up.
Researchers tried adding compost twice a year to young orange trees in Florida that were infected with citrus greening, a devastating disease spread by a tiny insect. The compost genuinely improved the soil and even got the roots more active and chemically enriched — but the trees still didn't grow bigger or produce more fruit. It turns out the disease's grip on the tree's internal systems was too strong for soil improvements alone to overcome, and the type of rootstock the tree was grafted onto had far more influence on how the tree performed.
Key Findings
Compost improved soil organic matter, pH, nutrients, and moisture, and increased fibrous root respiration and root length — real belowground gains.
Despite measurable root and soil improvements, compost had no effect on tree size or fruit productivity under citrus greening disease.
Rootstock selection, not compost application, was the primary driver of tree growth and yield among the four rootstocks tested.
chevron_right Technical Summary
Adding compost to citrus groves improved soil health and root activity, but couldn't overcome the devastating effects of citrus greening disease — the rootstock the tree was grafted onto mattered far more for actual fruit production.
Abstract Preview
Citrus production in Florida has declined drastically due to Huanglongbing (HLB), a bacterial disease associated with Candidatus Liberibacter asiaticus. This disease significantly reduces fruit yie...
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