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Pecan has an irregular bud break under mild climate areas, difficulting pollination and reducing yields, particularly in seasons when chilling accumulation is low and when only 50% of buds open. Hydrogen cyanamide (H 2 C N 2 ) at 1, 2, 4% alone or with mineral oil (MO) at 2, 4% were evaluated for their effect on lateral bud opening of `Wichita' pecans, spraying branches on january 25 or february 8. H 2 C N 2  and its mixtures with MO advances bud break 25 and 18 days as compared to control on first and second date application respectively; by march 20th shoots on applied branches had 8-14 cm lenght while control and MO treatments had only 2-3 cm.  Initial bud break was up to 85% on treated branches as compared to 60% of control; however and regularly, some shoots emerging from buds abscise thereafter. Remaining shoot number per branch was 4.8 with 4% H 2 C N 2  or the mixture 2% H 2 C N 2  + 2% MO on the first application date, and with 4% H 2 C N 2  + 2% MO on the second date, as compared to 2.5 shoots of control. A 12% bud injury occurred with 4% H 2 C N 2  on first date application and high rates of  mo  of second date.

IMPROVEMENT OF PECAN BUD BREAK BY APPLICATION OF HYDROGEN CYNAMIDE.