Evaluation on Some Treatments After Spring Frost Damage in Inflorescence Bud Formation in Pistachio Orchard

Abstract: (In the 3rd of April 2008) and in the morning of (16 April 2008), the temperature reached -6 ο C in some pistachio gardens of Kerman County especially in Sirjan. The coldness was so high that affected not only on the open flowers but also on bud endings and lop growth, So that the next year product was endangered, as well. In order to study the effect of some treatments and decrease the damage, some experiments were done in the form of split. Split was tested in the form of random block model so that original plot included irrigation treatments and nitrogen fertilizer was on 30 days after the cold happening , and secondary plot included prune treatments : in three levels, 1. Without prune, 2. Elimination of 30% of grown branches, 3. Elimination of 60% of grown branches. Allendance with pbz in three levels: 1. control, 2. 4 PPM Pbz, 3. 8 PPM Pbz with density. For every treatment, four repetitions were done, and the percentage of bud formation was measured. Results showed that although the irrigation after happening of coldness has stimulated the growth but it wasn't any influence on the next year product. Also it was defined that the mutual effect between irrigation and nitrogen fertilizer increased the formation of bud. The combination of irrigation, nitrogen fertilizer and 30% treatment caused the maximum of flower formation, and pbz increased the flower formation as well. According to results, it is said that 30% treatment could improve the problems of coldness