Per Review_ Growth biomass Macaranga
Abstract
Abstract.
Susanto D,
Mulyati S, Purnomo H,
Ruhiyat D
,
Amirta R
.
2017.
Growth, biomass production and nutrient a
ccumulation of
Macaranga gigantea
in response to NPK fertilizer application
.
Nusantara Bioscience 9:
330
-
337
.
Research described in this paper
investigated the effect of fertilizer application on the growth, biomass production and nutrient accumulation of
mahang
(
Macaranga
gigantea
) plant components. The experiment was carried out in a research area of the
Faculty of Forestry, Mulawarman University,
Samarinda, East Kalimantan. The effects of five dose levels of an NPK
(
16
-
16
-
16)
fertilizer on the growth rat
e of mahang seedlings
planted in field conditions
were compared. The treatments consisted of a control group
(
with no fertilizer), and dosages of 40 g, 80 g,
120 g and 160 g per plant. Fertilization at those levels was applied twice: the first application
at four weeks after the planting and the
second application at 6 months after the first. Growth rates between treatments were compared over a twelve month period. The
research
findings revealed that as the dosages of fertilizer increased, so the growth, bi
omass production and nutrient accumulation in components
of the plants also increased. The best growth was found in the treatment in which fertilizer was applied
(
twice) at a dosage of 120 g per
plant; at this dose level, by twelve months of age, the stem
basal diameter had reached 45.2
4.9 cm, stem height 219.2
39.1 cm,
number
of leaves per plant 17.3
1.2, and canopy diameter 246.7
25.0 cm. The highest production of above
-
ground biomass was also found in
the fertilizer treatment of 120 g per plant; the lar
gest proportion of the
biomass was in the leaves, followed by the wood, and then bark.
The nutrient element that had accumulated most in plants at 1 year of age was potassium, followed by phosphorus and then nitr
ogen.
The highest nitrogen uptake of stands
was found in the NPK fertilization with a dosage of 160 g per tree, while the highest phosphorus
and potassium uptake was found at a fertilizer dosage of 120 g per tree. The amount of nutrients accumulated in producing one
tonne of
above
-
ground biomass inc
reased in response to different fertilization treatments. The fertilizer treatment of 120 g per plant
(
applied
twice; the first soon after planting and the next after 6 months) resulted in the accumulation within the 1 year old plants o
f 2.38 kg of
nitroge
n, 6.36 kg of phosporus and 17.83 kg of potassium, with an N:P:K ratio of 13.3 : 35.6 : 100. The availability of the element
potassium needs
special attention when this species is cultivated.
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