PREDIKSI KADAR PATI UBI KAYU (MANIHOT ESCULENTA) PADA BERBAGAI UMUR PANEN MENGGUNAKAN PENETROMETER
ABSTRACT: Over the years,
determination of starch content by the buyers on the field is performed based
on the difference between cassava’s weight on the air and that of in the water,
then counted based on the formula designed by International Starch Institute
(ISI). This method has been proven to be highly correlated with the starch
content determined chemically such as acid hydrolysis. However, this method is
less practical due to the need of a large amount of water which is rarely found
on cassava plantation. The aims of this study were : 1) to find alternative way
to measure cassava’s starch content on the field using penetrometer, 2) to find
correlation between starch content measurement using penetrometer and weighing
method as described by ISI; correlation between hardness measured using
penetrometer and acid hydrolysis. The experiment was arranged as a single
treatment harvesting period consisted of 7, 8, 9 and 10 month in a complete
randomized design with three replications. Data were analyzed
using linier regression to find correlation between hardness and starch content
analyzed using acid hydrolysis ; correlation between starch yield and starch
content analyzed using acid hydrolysis; correlation of starch content analyzed
using acid hydrolysis and that of using ISI method.
The result shows that there is a high positive correlation between
cassava’s hardness using penetrometer and cassava’s starch content using acid
hydrolysis method. This implies that penetrometer is a potential tool for
predicting cassava’s starch content.
Keywords: cassava,
penetrometer, hardness, starch content
Penulis: Siti Nurdjanah, Susilawati,
Maya Ratna Sabatini
Kode Jurnal: jppertaniandd070035
