Three field trials were carried out during 2000 and 2001 seasons at three different locations, i.e., Agric. Res. Exp. Stat. of NRC at Kaluobia Governorate and Agric. Res. Stat. of ARC at Giza as well as Ismaillia Governorates. This work aims to evaluate fourteen flax genotypes with regard to straw yield, yield components and technological fiber properties. Estimation of genotypes ϫ environments as well as variance components, heritability and correlation coefficient among straw yield and its components were also reckoned.

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Maximum yield per unit area may be obtained by growing maize hybrids that can withstand high plant density. Maize genotypes differ in plant density tolerance (PDT). The objectives of the present investigation were to identify the density tolerant genotypes, to estimate the superiority of tolerant (T) over sensitive (S) inbreds and testcrosses and to identify the trait(s) of strongest association with PDT. Ninety-six testcrosses were produced between 23 inbreds and three testers. All genotypes were evaluated under low (LD), medium (MD) and high (HD) density (47,600, 71,400 and 95,200 plants/ha, respectively). The highest stress tolerance index (STI) under HD and MD was exhibited by the inbred lines L21, IL15, IL53, Inb176, IL80, L28, IL151 and L14 and the testcrosses IL51 × Giza2 , IL51 × SC10, L14 × SC10, L28 × Sd7, IL53 × SC10 and L28 × SC10, in descending order. Grain yield/ha (GYPH) of density tolerant (T) was greater than the sensitive (S) inbreds and Original Research Article

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