02105nam a2200253 a 450000100080000000500110000800800410001910000220006024501320008226000610021450001210027552012620039665000130165865000110167165000180168265000130170065000190171365000080173265000190174065300260175965300160178565300270180170000230182818880702023-07-13       2010    bl uuuu     u00u1 u    #d1 aLEAO, P. C. de S.  aEffects of hydrogen cyanamid on bud breaking of the grapevine Italia in the São Francisco river valley.h[electronic resource]  aActa Horticulturae, n. 864, p. 157-162, jun. 2010.c2010  aEdição do Proceedings of the III International Symposium on Tropical and Subtropical Fruits, Fortaleza, jun. 2010.  aUnder tropical climate conditions, as in the São Francisco River Valley, Northeast Brazil, grapevine presents bud dormancy and high apical dominance. The present work aimed at evaluating the effects of hydrogen cyanamid, spreader-sticker and torsion of the canes on grapevine bud break, yield and fruit quality of the ‘Italia’ table grape cultivar, in the São Francisco River Valley. The experiment was carried out at Petrolina-PE, in the semi-arid region of Northeast Brazil, during two harvest seasons (2001–2002). The treatments were as follows: T1: control; T2: H2CN2 2.45%; T3: H2CN2 2.94%; T4: H2CN2 3.43%; T5: H2CN2 2.94% + Break- Thru® 0.03% and T6: H2CN2 2.45% + torsion of the canes, in a randomized complete block design with four repetitions. The results howed that hydrogen yanamid, independent of the concentration, increased bud burst and bud fruitfulness, with increments of 68% and 84% in the yield per plant, respectively in the 1st and 2nd harvest seasons. There was no significant effect on berry size, sugar and acidity content of the fruits and harvest anticipation. There was no answer to spreader-sticker. On the other hand, the practice of cane torsion presented a tendency to increase the effects of the hydrogen cyanamid.  aDormancy  aGrapes  aSeed dormancy  aBrotacao  aFrutificação  aUva  aVitis Vinifera  aCianamida hidrogenada  aUva de mesa  aVale do São Francisco1 aSILVA, E. E. G. da