Uji Orthogonal Kombinasi Pupuk Anorganik-Organik pada Pertumbuhan Bibit Kopi Arabika (Coffea arabica L.)

Abstract

The objective of this research is to find out the best proportion of organic and inorganic fertilizer application for Arabica seedling, to find out a dose of organic fetilizer that can reduce the use of inorganic fertilizers all least 50%, and to find out the best kind of organic fertilizer for growing Arabica coffee seedlings. The research was conducted in Bogor Agricultural University Experimental Station, Cikabayan, Darmaga-Bogor, from May 2013 to February 2014. The experiment was arranged in a split plot design with three replications. The main plots were four shading levels, i.e. 25%, 50%, 75% and 95%, while subplots were five combinations of inorganic-organic fertilizers. It consist of 5levels of fertilizers ratio sub-plot; 100% inorganic fertilizer (P1), 50% inorganic fertilizer + 50% coffee pulp compost (P2), 25% inorganic fertilizer + 75% coffee pulp compost (P3), 50% inorganic fertilizer + 50% cow manure (P4), and 25% inorganic fertilizer + 75% cow manure (P5). There were 20 treatment combinations andeach combination consisted of 3 replicates. Therefore, there were 60 units of trial. Each units of trial consisted of 11 seedlings of coffee. They were arranged 30cm x 30cm away among the polybags. Three seedlings out of eleven were set as samplings. The best application of inorganicorganic fertilizer is 25 % inorganic fertilizer + 75 % organic manure. Application of inorganic-organic (P2, P3, P4, P5 vs P1) than inorganic fertilizers significantly increased plant height, leaf number, steam diameter (3-7 MAT), wet weight and dry roots (4 and 7 MAT), wet weight and dry canopy, root length, root volume, leaf area, the content of P , K and nutrient uptake N, P K. The best organic fertilizers on the growth of Arabica Coffee (Coffea arabica L.) seedlings is organic manure.Organic manure application reduces inorganic fertilizer up to 75%.