Pengaruh Aplikasi Pupuk Organik Cair (POC) terhadap Fisiologi dan Morfologi Bibit Kopi Arabika (Coffea arabica) pada Cekaman Suhu Tinggi.

Abstract

ERINA LAILANI SAFITRI. Pengaruh Aplikasi Pupuk Organik Cair (POC) terhadap Fisiologi dan Morfologi Bibit Kopi Arabika (Coffea arabica) pada Cekaman Suhu Tinggi. Dibimbing oleh AIDIL AZHAR. Keterbatasan hara pada fase pembibitan memengaruhi mutu bibit kopi Arabika dan keberhasilan transplantasi. Penelitian ini menganalisis pengaruh sembilan konsentrasi pupuk organik cair (POC) fermentasi ampas kopi dan kotoran babi (N 1,08%; P2O5 1,49%; K2O 1,03%) terhadap konduktansi stomata (gs), efisiensi Fotosistem II (Fv/Fm), arsitektur akar, dan pertumbuhan vegetatif bibit Arabika umur tiga bulan. Percobaan rancangan acak lengkap dilakukan di VNUA (September–Oktober 2025) dengan sembilan perlakuan dan 15 ulangan, dianalisis menggunakan analisis ragam dan DMRT (a = 5%). POC tidak memengaruhi gs. Konsentrasi 1/30–1/40 meningkatkan Fv/Fm dibanding kontrol. POC meningkatkan klorofil daun, tetapi menurunkan volume dan luas permukaan akar pada sebagian besar perlakuan. Konsentrasi 1/10 menghasilkan dimensi daun terbesar. Hasil ini menunjukkan adanya kompromi antara perbaikan fisiologis, ekspansi daun, dan perkembangan akar antarkonsentrasi POC.

ERINA LAILANI SAFITRI. Effect of Liquid Organic Fertilizer (LOF) Application on the Physiology and Morphology of Arabica Coffee Seeds (Coffea arabica) at High Temperature Stress. Supervised by AIDIL AZHAR. Nutrient limitation during the nursery stage affects Arabica coffee seedling quality and transplant success. This study evaluated nine concentrations of liquid organic fertilizer (LOF) produced from fermented coffee pulp and swine manure (N 1.08%; P2O5 1.49%; K2O 1.03%) on stomatal conductance (gs), Photosystem II efficiency (Fv/Fm), root architecture, and vegetative growth of three-month-old Arabica seedlings. A completely randomized design was conducted at VNUA (September–October 2025) with nine treatments and 15 replications, analyzed using analysis of variance and DMRT (a = 5%). LOF did not affect gs. The 1/30– 1/40 concentrations increased Fv/Fm relative to control. LOF increased leaf chlorophyll, but reduced root volume and surface area. The 1/10 concentration produced the largest leaf dimensions. These results indicate trade-offs among physiological improvement, leaf expansion, and root development across LOF concentrations.