Assessment of yield stability in sugarcane genotypes using non-parametric methods
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Universidad Nacional de Colombia
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The evaluation of performance stability and high yields is es-sential for yield trials in different environments. This studywas carried out to identifysugarcane genotypesthat have botha high mean cane yield, mesured in tons of cane per hectare(TCH), and stability across seven different environments, using11 non-parametric statistical methods: Si(1), Si(2), Si(3), Si(6), NPI(1),NPI(2), NPI(3), NPI(4), RS, TOP and DE. The data came fromacane yield of 20 genotypes, as measured at seven locations overthree crop-years in the sugarcane regional trials of the InstitutoNacional de Investigaciones Agrícolas (INIA) of Venezuela.The genotypes V99-213, V99-236 and V00-50 showed promis-ing yields and stability according to all of the non-parametricstatistics. The TCH presented a positive association with theTOP, NPI(2), NPI(3)and Si(6)statistics. The analysis distinguishedtwo groups of statistics using a principal component analysis(PCA). The first group (G1) was composed of the TOP, NPI(4),NPI(2), NPI(3), Si(3)and Si(6)statistics, which were located underthe concept of dynamic or agronomic stability because they areassociated with yield. The other group (G2) was composed ofthe NPI(1), Si(1), Si(2), DE and RS statistics, which fell within thestatic or biological stability concept.
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