Klasifikasi genotipe tanaman kenaf (Hibiscus cannabinus) menggunakan model Ammi

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ABSTRACT

YHANUAR ISMAXI,

PURBOKUSUMO.

Genotypes Classification of Kenaf (Hibisczrs canna-

binzrs) Using AMMI Model. With guidance from

TOTONG

MARTONO and I MADE SUMERTAJAYA.

Multi-environments trials are effort in agriculture research to identify superior cultivars by

examining adaptability of many genotypes of a cultivar in different environments. The expectation

fiom these multi-environments trials is to find genotypes which highly adaptive in many environ- ments (stable genotypes) and genotypes which only adaptable in certain environments (specific ge- notypes).

Statistical method generally used for analysis of stability towards multi-environmeilts trials is AMMT (Additive Main Effect and Multiplicative Interaction) analysis. This method combines additive analysis of variance for treatments main effect and principal components analysis for interaction effect. Multi-responses become a special problem in AMMI analysis since this analysis can only works in single response. Thus, in many years analysis for multi-environments trials merely focused in one single response. There are infomation unexplained by rely on one only response.

In order to use AMMI in multi-environments trials with 1nu1ti-responses, we have to combine those responses first. One of statistical lnethods for responses combining in multi-environments trials is W-PCA (Weighted Principal Components Analysis). Responses combination produce new variable named IPT (Cultivar Performance Index).

This research use secondary data from Malang Research Institute of Tobacco and Fiber Plants (Balittas Malang). This data is about multi-environments trial of Kenaf conducted in East Kalilnantan in 2003-2005. There are 15 genotypes of Kenaf, planted in 6 different environments, with 3 blocks. The responses are plant-heights, plant-diameters, fresh trunk-weights, and fiber yield.

Analyses of multi-environments trials of Kenaf produce classifications of genotypes stability, each base on plant-heights, plant-diameters, fiber yield, and

TPT.

Fresh trunk-weights can not be used to produce classification of genotypes stability. There is no genotype classified stable by more than two responses. Genotype classified stable by two responses are G I 4 (plant-heights and IPT) and G4 (pIant-diameters and fiber yield).