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Edmunds, C. C. , On certain finitely based varieties of semigroups, Semigroup Forum , 15 (1977), no. 1, 21–39. MR 57 #3286 Edmunds C. C. On certain finitely based varieties of

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. & Chesson, A. (2002): Phenolic compounds, lycopene and antioxidant activity in commercial varieties of tomato ( Lycopersicum esculentum ). J. Sci. Fd Agric. , 82 , 323–330. Chesson A

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References [1] Jones , P. R. , Mal’cev products of varieties of completely regular semigroups , J. Austral. Math

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Cereal Research Communications
Authors: Julio Rodríguez-Casas, Oscar Moreno-Ramos, Donald Johnson, Eduardo Canseco-Vilchis, Thomas Thompson, and Jesús Salazar-Gómez

Wheat ( Triticum aestivum L.) population density (PD) could be used to improve the wheat production technology in Northwestern Mexico. Tillering capacity is a characteristic of the variety. Theoretically, the recommended PD should not be modified by the variety. The objective of this study was to determine the effects of the variety (V) and PD on wheat yield and other components. A field study was carried out at the Yaqui Valley Agricultural Experimental Station, in Sonora, Mexico. It consisted of a complete factorial of five wheat varieties: Aconchi C89, Tepoca T89, Oasis F86, Altar C85, and Rayon F89, and seven PD treatments: 20, 40, 80, 160, 240, 320 and 800 thousand plants per hectare (TPPH)) in a split plot design with varieties as main plots and the PD as subplots in a complete randomized block design with five replications. For all the evaluated variables, the response to PD was different according to the variety, mainly in treatments with low PD, and as this was increased, the response turned asymptotic, with optimum PD being different for each variety. The maximum yield and the other wheat components were reached with the optimum PD, around 160 TPPH. The number of tillers per plant (TPP) always decreased with increased PD, while the harvest index (HI) was not affected by the studied factors.

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597 Artal Bartolo, E., Carmona Ruber, J. and Cogolludo-Agustín, J. I. , Essential coordinate components of characteristic varieties, Math. Proc. Cambridge Philos. Soc

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References [1] A shley , C. , B urelle , J.-P. , L awton , S. , Rank 1 character varieties of finitely presented groups. Geometriae Dedicata 192 ( 2018 ), no

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Denecke, K. and Lüders, O. , Categorical equivalence of varieties and invariant relations, Algebra Universialis , 46 (2001), 105–118. MR 2002e :08004 Lüders O

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Auinger, K. , On the lattice of existence varieties of locally inverse semigroups, Canad. Math. Bull. , 37 (1994), 13–20. Auinger K. On the lattice of existence varieties of locally

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lattice and β ∘ h γ is β ∘ γ ∘ β ∘ γ ... with h factors ( h – 1 occurrences of ⚬). Considering now a variety 𝓥, it follows from standard arguments in the theory of Maltsev conditions that 𝓥 is congruence distributive if and only if, for every h

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): Szőlőfajta-ismeret és-használat . (Description and utilisation of vine varieties.) Mezőgazdasági Kiadó, Budapest Zilai J. Szőlőfajta-ismeret és

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