| Abstrak/Abstract |
The available soils for surgarcane plantation is Ultisols. However, the Ultisols has some limitations on its chemical
fertility. Efforts to improve the quality of the soil can be done with applying organic matter such as filter cake and
bagasse ash resulting from the process of making sugar from sugarcane. This study was proposed to determine the effects
of bagasse ash and filter cake to availabilities of NPK in the soil and NPK uptakes by sugarcane, so that they were
expected to be able to improve maximum sugarcane growth in Ultisols in Tulang Bawang. This field research used
completely randomized design with two factors. The first factor was the bagasse ash doses in four levels: without
bagasse ash (A0), 10 ton/ha of dry bagasse ash (A1), 20 ton/ha of dry bagasse ash (A2), and 40 ton/ha of dry bagasse
ash (A3). The second factor was the filter cake doses in four levels: without filter cake (B0), 20 ton/ha of dry filter cake
(B1), 40 ton/ha of dry filter cake (B2), and 80 ton/ha of dry filter cake (B3). There were a total of 16 combinations of
treatment with 3 blocks as repetitions. Data were analyzed by using F-test with 5% significance. When analysis result
showed significant differences between treatments, it was then followed by DMR test with 5% significance level for
normal data. The results showed that the improvement of NPK status of Ultisols in Lampung might be achieved by
applying the filter cake and bagasse ash techniques. Some results of this study showed that treatment of 40 ton/ha
bagasse ash for NPK uptakes was significantly different and higher than without bagasse ash treatment. Treatment of
80 ton/ha filter cake for NPK uptakes was significantly different and higher than without filter cake treatment. The
highest N uptake (27.84 kg/ha) was in sugarcane at 2 MAP with 80 ton/ha filter cake treatment. The highest P uptake
(11.59 kg/ha) was in sugarcane at 2 MAP with 40 ton/ha bagasse ash treatment. The highest K uptake (117.67 kg/ha)
was in sugarcane at 8 MAP with 80 ton/ha filter cake treatment. Treatment of 80 ton/ha filter cake influenced significantly
to the sugarcane height compared to without filter cake and 20 ton/ha filter cake treatment, but it did not differsignificantly
compared to 40 ton/ha filter cake treatment. The highest sugarcane (167.99 cm) was at 80 ton/ha filter cake treatment.
Filter cake dose treatments did not influence significantly the numbers of saplings and stem diameter of sugarcane
aged 8 MAP.
Received: 8th November 2017 ; Revised: 23rd November 2017 ; Accepted: 29th December 2017
INTRODUCTION
Sugar is one of basic needs for most of people
and it is a relative cheap calorie source. Sugar
consumption is increasing annually and it provides
a wide opportunity forsugar production improvement.
One of efforts to increase national sugar production
isbyenhancingsugarcaneplantationland(extensification).
Flat land availability for sugarcane is decreasing
annually because there are land competitions for other
commodities, and converting of sugarcane fieldsinto
housing and industries. Therefore, the sugarcane
plantation areas are enhanced to dry sloping land
which approximately constitutes 47% of total of
land width in Indonesia. Thisis possible because most
of land areas in Indonesia are located in mountains
(>30%) and hills (15-30%) with 51.3 million ha and
36.9 million ha respectively (Dariah and Las, 2010).
The main soil type in the dry land is ultisol with 54.7
million ha in width. For sugarcane culture, the ultisol
soil has problems with erosion because the surface
layer is easy to be compacted by any loading pressure
which causes infiltration progress to be slow, low
alkaline saturation (less than 35% of standard of 8.2
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