YIELD PLASTICITY AND STABILITY OF TRITICALE VARIETIES (X TRITICOSECALE WITTM.) UNDER INCREASING NITROGEN FERTILIZATION NORMS. PUBLISHEDHristofor Kirchev, Emil Penchev, Rumyana Georgieva
Used were three years data for yield of grain from triticale varieties with a different genotype, cultivated under conditions on an experimental field of the Crop Science Department at Agricultural University – Plovdiv: AD-7291 (standard), Sadovec and Zaryad (wheat type), Rakita and Rojen (rye type). With increasing of the nitrogen fertilization norm, the variation of the plasticity index between the varieties, is the lowest and in all of them bk values are about a zero. Average values of plasticity coefficient define varieties Rakita and Sadovec as ecological plastic. The lowest ecological plasticity manifests the standard AD-7291. Almost all varieties show the highest stability coefficient at the highest fertilization norm, except variety Zaryad, where the most stable yield was determined by fertilization with N120. Rye type varieties manifest higher stability than wheat triticale sorts.
triticale, plasticity, stability, yield,