Monday, March 23, 2009

Study of Fluazifop Buthyl and Glyphosate Potassium as ripeners on PS 951 cane variety

Suyoto Hadisaputro *), Pudjiarso dan Catur Okariana
(Indonesian Sugar Research Institute Jl.Pahlawan 25 Pasuruan 67126)


Cane ripeners have been comercially used in Indonesian sugar industry. Recently, there are three new chemical products, such as: Fluazfop Buthyl 150 g/l product (FB-1), Fluazfop Buthyl 125 g/l product (FB-2) and Glyphosate Potassium 620 g/l product (GP), that potentially can be used to spur maturation of cane. In order to study a performance of the three chemicals as cane ripeners, at the Indonesian Sugar Research Institute (ISRI) Pasuruan was conducted efication research with use PS 951 as a cane variety tested. In this experiment was also studied Isoprophylamine Glyphosate (IG) as a standar recommended ripeners. The parameter observed were: (1) maturation factor (MF) and (2) components of juice qualities of cane, such as: brix, pol, purity, and sucrose content, (3) cane yield, (4) toxicity rate of cane to chemicals tested, and (5) growth performance of ratoon crop (RC). The results of the experiment showed that FB-1, FB-2 and GP were able to spur the maturation and increase juice quality of PS 951 cane variety tested, and it were similar with showed by IG on 0,80 l product/ha. All the chemicals tested, include IG, caused clorotic symptom on leaves and dead of growth point but it were not reduce the cane yield. Moreover, the poisoning symptoms on PC were not depressed the cane growth performance of RC. The significantly effect of the three chemicals tested as ripeners were found at 4-5 weeks after treatment (wat) and the effective dosage aplications were 0,60-0,90 l product/ha.

Key words: Cane ripeners, Fluazifop butyl 150 g/l product (FB-1), Fluazifop butyl 125 g/l product (FB-2), Glyphosate Potassium (GP), Isopro¬phyl¬amine glyphosate (IG), PS 951

Friday, March 6, 2009


Toto Martoyo* dan Agus Bachtiar*
*Pusat Penelitian Perkebunan Gula Indonesia

Cane juice purification at sugar factory (SF) is the important step because it affects the performance of the following processing steps. Many SF’s (> 90%) in Indonesia utilize sulphitation process for cane juice purification, which includes continuous settling process in a clarifier tank to separate the clear juice from the scum. In general, the quality of clear juice is low, because it still contains suspended particles and macromolecules such as polysaccharides and proteins. The juice impurities will cause some problems in further juice processing steps, such as colour formation, viscous massecuites and finally lowering sugar recovery. Therefore, ultrafiltration (UF) membrane as a new technology is introduced to solve those problems. This technology has been applied and widely used in other industries such as HFCS (high fructose corn syrup) and pharmaceutical industry. This research project was conducted to study the performance of UF membrane in pilot scale as an in-line unitat SF hence the unit was able to process continuously. The objective of this research projects was to study the characteristics of permeate juice, retentate juice as well as the unit of ultrafiltration. The results showed that the quality of permeate juice was increased. It was showed that turbidity, colour and CaO content can decrease by 95%, 50%, 20 %, respectively and juice purity increases by 1.3 point. That means more sugar will be recovered when the cane juice from UF membrane is further processed. It is estimated that 4 ton more sugar with better quality is able to be recovered per day from SF with capacity 3000 ton cane per day (TCD). Furthermore,the results from membrane UF characteristic showed that flux achieves about 33 L/ m2.h , 44 L/ m2.h and 30 L/ m2.h at VCR 5, VCR 10 and VCR 15, respectively.

Keywords: technology, membrane, ultrafiltration, clear juices, sugar factory