Abstract
The aims of this study were: (i) to determine the response of cocoa seedling growth to cocoa root PGPR; (ii) determine the appropriate PGPR concentration of cocoa roots for the growth of cocoa seedlings. The research was carried out in June – December 2021, located in the Jember State Polytechnic nursery with an altitude of 89 m above sea level. The study used non-factorial RAK, namely: PO = PGPR concentration 0 ml/liter/5 polybags; P1 = PGPR concentration 50 ml/ liter / 5 polybags; P2= PGPR concentration 100 ml / liter / 5 polybags; P3 = PGPR concentration 150 ml / liter / 5 polybags and 6 replications. The results showed: (i) Cocoa seedling growth response by giving PGPR (Plant Growth Promoting Rhizobacteria) Cocoa Roots had a significant effect on plant height, number of leaves, stem diameter, wet weight and dry weight of roots, number of roots and root volume; (ii) Provision of optimal PGPR concentration of cocoa roots on root dry weight : 109 ml / l and root wet weight : 99 ml / l.
Highlights
Cocoa Roots had a significant effect on plant height
Auburn University Web Site, Available: http:// www.ag.auburn.edu / argentina / pdfmanuscripts / kloepper.pdf. [Accessed 30 June 2006]
Summary
Berat basah bibit tanaman kakao dilakukan dengan mengambil 2 sampel tanaman acak 2 tanaman dari setiap plot. Uji kontras polinomial konsentrasi PGPR terhadap pertumbuhan berat basah akar bibit kakao, nampak pada gambar dibawah ini: Gambar 9. Berdasarkan uji lanjut kontras polinomial dapat diketahui bahwa dalam pengaplikasian konsentrasi PGPR berpengaruh nyata secara kuadratik pada taraf 1% pada berat basah akar. Berdasarkan uji lanjut kontras polinomial dapat diketahui bahwa dalam pengaplikasian konsentrasi PGPR berpengaruh nyata secara kuadratik pada taraf 1% pada berat kering akar. Bakteri PGPR memiliki kemampuan sebagai penyedia unsur hara pada tanaman yang disebabkan oleh kemampuannya melarutkan mineral-mineral dalam bentuk senyawa kompleks menjadi bentuk ion sehingga dapat diserap oleh akar tanaman, Menurut penelitian (Jumin, 2002) bahwa ketersediaan unsur hara sangat menentukan produksi berat kering tanaman yang merupakan hasil dari tiga proses yaitu proses penumpukan asimilat yang melalui proses fotosintesis, respirasi dan akumulasi senyawa organik
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