Stability parameters proposed by Lin and Binns (1988) compared with regression method

Abstract

The stability parameters proposed by Lin & Binns (1988) method for yield of seed cotton were compared with the regression method proposed by Eberhart & Russell (1966). The experiments were composed by nine cultivars tested at randomized complete block design with six replicates carried out by CNPA in sixteen sites on Northeast Brazil in 1991 and 1992. The estimate comparison between the two methods was performed by Spearman rank correlation. The cultivars CNPA 6H and CNPA 85-241 showed high yields, β₁ ≥ I, R² > 95%, low values of P_i and contributed only with 2.1 and 3.5% of total interaction while the CNPA Giorge I was the more instable. The Spearman rank correlation between β₁ and P_i in 1992 was -0.96 significative by t test (P ≤ 0,01) indicating that these parameters provided the same results. The advantage of P_i utilization is that there is no restriction on the independence of variables and also it indicates the materials with performance near the maximum value in different environments tested.