Peningkatan Potensi Fosfat Alam Ayamaru Melalui Inokulasi Bakteri Pelarut Fosfat danPengaruhnya Terhadap Pertumbuhan Bibit Kakao
| Main Author: | Suparno, Antonius |
|---|---|
| Format: | Article info eJournal |
| Terbitan: |
Agrotek
, 2010
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| Online Access: |
http://jurnal.unipa.ac.id/index.php/agrotek/article/view/167 |
Daftar Isi:
- The purpose of this study was to find the effectiveness of phosphate solubilizing bacteria (PSB) isolates for improving the beneficial use of Ayamaru phosphate rock (APR) in cacao seedlings. The two factors-factorial experiment was set up in a Completely Randomized Design. The first factor was five levels of APR dosages: 0, 0.5, 1.0, 1.5, 2.0 g P2O5/seedling and 2.0 g P2O5 SP36/seedling used as a comparison. The second factor was PSB isolates inoculation consisting of RJM.30.2 isolate and FT.3.2 isolate with none PSB. F1 UAH cacao seeds from Coffee and Cacao Research Center in Jember, East Java were used. The seedlings were grown under 60% of shading net for four months. The results of the study proved that FT.3.2 isolate produced higher amount of citrate acid exudates (134.23 ppm) and thus had higher ability to solubilize of fixed P compare to RJM.30.2 isolate (101.45 ppm). In RJM.30.2 inoculated seedlings, the increasing of APR dosage up to 2.0 g P2O5/seedling resulted in linear increase of shoot dry-weight about 202.12% and 142.75% of available P, while inoculated with FT.3.2 isolate, shoot dry-weight was increased approximately 60.51% and 126.61% of available P. Furthermore, in the non-inoculated seedling the shoot dry-weight was increased about 149.81% with 191.11% available P. Compare to APR dosage at 2.0 g P2O5/seedling at non-inoculated seedling,the inoculation of RJM.30.2. isolate was able to improve shoot dry-weight as much as 48.41% and 3.12% available P leve , while FT.3.2 isolate gave 78.18% and 9.36%, respectively.