THE IMPACT OF MEDIA TYPE AND DOSE OF NITROGENFERTILIZER TO THE SEEDLINGGROWTH OF Accacia mangium Willd

Abstract

AccaciaMagniumWilld. is one of plant species which is used for industrial
rawmaterials pulp and paper. Since 1984, government has allocated 1,4 million hectares of
this plant but the annual average abilityof Sumatera is just about (70.000 – 120.000). the
growth and the development of acacia depend on seeds sources and the condition of soil
nutrient in the media used. Themassively use of topsoil as the seedling media will make
bad effect to the land, so that other alternatives which are can be used such as :
sawdust,rice huskash, municipal solid wastecompost, organic material or fallenleaves of
plantscompost and dung compost is needed. N element in right amount has important role
in the growth of seed, still we need 0,46 gram/polybag (1 gram TSP/ polybag) of P
element. Supplementaryfertilizer is given twice to 15-day-old and 30-day-oldafter weaning
seedlings, the dose is 0,1 gram/polybag (0,2 gram of Urea/polybag and 0,2 gram KCL/
polybag) for each of N and K element. The aims of the research are: to know the kind of
suitable alternative media; the dose of nitrogen fertilizer and the interaction of them both to
the growth of AccaciamangiumWilld seed. The research is done in the Kranjingan village,
Sumbersari sub-district, Jember at altitude ± 89 m above sea level in April to July 2009.
The research usesrandomized block design which is factorialy (4x3)repeated3 times. The
first factor is the kind of growing media (M) which is consist of 4 experimental stage those
are: M1= top layer of the soil (topsoil); M2=municipal solid waste, sawdust , rice huskash
(1:2:1); M3=municipal solid waste, sawdust , rice huskash (2:2:0); M4:municipal solid
waste, sawdust , rice huskash (0:2:2). The second factor is the dose of nitrogen fertilizer
(P) which is consist of three experimental stage those are: P0=0 gram N/ polybag (0,0 gram
urea/polybag); P1 =0.09 gram N/polybag (0,2 gram urea/polybag); P2 = 0,18 gram
N/polybag (0,4 gram urea/polybag). Observationalparametersinclude: height, the amount
of leaf, stemdiameter which is observed on 14, 28, 42, 56, 70, and 84 HST; The length
andnumber ofmainroot at 84 HST and the arise of crescent leaf (HST). The result of the
research: a. alternative media M1 (topsoil which is contain of organic material that is
pineleaf litter) is the best media for all of the growthobservation of seedlingsparameters; b.
application offertilizer dose P1 (0,09 gram N/polybag or 0,2 gram urea/polybag) is the best
dose for all of growthobservation of seedlingsparameters and more efficient use; c.
Interaction occur and MIPI treatment (topsoil alternative media which is contain of
pineleaf litter with 0,09 gram/polybag of nitrogen) is the best result especially for
diameterobservationparameters and the time when crescent leaf of the plant appear.