| Summary: | An experimental research on the effectiveness of GAFSA Rock Phosphate to rubber plant was carried out in greenhouse, using 'RR1C 100' clone at six months old planted in polybag and arranged in completely randomized design, and in field, using completely randomized block design with 'GT 1' clone at 43 months old. The soil was spodosol and preliminary analysis had shown that the soil were vet)) low in P content. Therefore, a research on application of phosphate fertilizer on the soil is relevant to be carried out.
The results indicated that GAFSA did not affect 'RRIC 100' growth (trunk diameter, dry and fresh weight) significantly, compared with other phosphate fertilizers examined. The field experiment showed that the effect of GAFSA fertilizer on the growth of 'GT I 'clone is significantly different with the other rock phosphate (om China and Jordan).
Keywords.- young rubber plant, fertilizer effectivity, rock phosphate
Hasil analisis tanah ordo spodosol inenunjukkan bahwa kandungan unsur hara di dalam tanah terutama P sangat rendah sehingga penelitian pupuk fosfat cukup relevan dilakukan pada ordo tanah tersebut. Percobaan efektivitas pupuk fosfat alam Gafsa pada bibit tanaman karet klon RR1C 100' di polybag telah dilakukan di rumah kaca dengan rancangan acak lengkap sampai dengan umur 6 bulan dan percobaan di lapangan menggunakan klon `GT-1' sampai umur 43 bulan dengan rancangan acak kelompok.
Hasil penelitian menunjuklcan pengaruh pupuk fosfat alam Gafsa terhadap pertumbuhan tanaman klon `RRIC 100' di rumah kaca tidak berbeda nyata dengan perlakuan pupuk fosfat lainnya. Hasil penelitian lapangan pada klon `GT-1' terbukti bahwa perlakuan pupuk fosfat alam Gafsa berpengaruh nyata terhadap pertumbuhan tanaman dibandingkan dengan perlakuan pupuk fosfat alam Jordan dan Cina.
Kata kunci: tanaman karet muda, efektivitas pupuk, fosfat alam.
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