MICROBIAL COMMUNITY BEHAVIOUR IN THE RHIZOSPHERE OF KILEMO (LITSEA CUBEBA L. PERS) AFTER PRUNING
ABSTRACT: Pruning is a
removing some parts of the tree canopy, either for improving tree shape or
increasing shoot productivity. It can be implemented in yield management of
commodities that are harvested its shoot biomass, such as tea or kilemo. This
activity interferes plant growth, hence affect root secretion. Consequently, it
alters soil microbe populations in the rhizosphere. This paper observes the
impacts of pruning on fluctuation of root exudates (soil sugar) and rhizosphere
communities of 2-years-old Kilemo (Litsea cubeba L. Pers.). Tree samples were
pruned by removing shoots above the lowest branches. A month after cutting,
trees were fertilized using three types of fertilizers: leaf, NPK, and organic
fertilizer. As a control, there were non-fertilized treated trees. To observe
the root exudation and microbes populations, 0−20 cm depth of soil at
rhizospheres were collected from 10th, 30th, 60th and 90th day after
pruning. Samples were further analyzed
for observing the amount of soil-sugar and microbes population, such as
N-fixer, cellulose degrader, and phosphate solubilizer. Results show that
Kilemo root drastically decreased their sugar exudation by 22% (10th day), 28%
(30th day), 44% (60th day) and 70% (90th day), respectively. Therefore, those
populations were significantly depleted.
Rhizosphere sugar can be improved by fertilization, however, the augmentation
did not enhance the rhizosphere communities.
KEYWORDS: cellulose-degrader;
phosphate-solubilizer; pruning; rhizosphere; root exudates
Penulis: Enny Widyati
Kode Jurnal: jpkehutanangg160017
