This research was carried out in order to determine the effects of nitrogen and phosphorus fertilization on yield, some fruit characteristics, hormone concentrations, and alternate bearing in pistachio (Pistacia vera L.) cv. ‘Kırmızı’ grafted on P. vera over 3 consecutive years. | Research Article Turk J Agric For 34 (2010) 33-43 © TÜBİTAK doi: The effect of nitrogen and phosphorus fertilization on yield, some fruit characteristics, hormone concentrations, and alternate bearing in pistachio Nurdan Tuna GÜNEŞ1, Yeşim OKAY1, A. İlhami KÖKSAL1,*, Mehmet KÖROĞLU2 1 Ankara University, Faculty of Agriculture, Department of Horticulture, 06110, Ankara - TURKEY 2KAYRA-TR Strj. Araştırma, Eğitim ve Danışmanlık Ltd. Şti., Gaziantep - TURKEY Received: Abstract: This research was carried out in order to determine the effects of nitrogen and phosphorus fertilization on yield, some fruit characteristics, hormone concentrations, and alternate bearing in pistachio (Pistacia vera L.) cv. ‘Kırmızı’ grafted on P. vera over 3 consecutive years. Nitrogen was applied at the rate of 0 (control), 800, 1000, and 1200 g tree1 , and phosphorus was applied at the rate of 0 (control), 200, 400, and 600 g tree-1 into the soil. As a result, although yield mostly decreased and nut weight increased, especially in the 2nd year (‘off ’ year), considerable interactions among fertilizer rates were determined for only nut weight, auxin, gibberellic acid, and zeatin concentrations (P ≤ ). For all parameters investigated in this study, a stable and regular effect of fertilizers applied into the soil was not observed, probably because of this species’ characteristics. Therefore, further research, including longer treatment periods, is needed to determine the effects of fertilizers. Key words: Alternate bearing, fertilization, GA3, IAA, nut weight, Pistacia vera L. Antepfıstığında azotlu ve fosforlu gübrelemenin verim, bazı meyve özellikleri, hormon konsantrasyonları ve periyodiste üzerine etkisi Özet: Bu çalışma, P. vera üzerine aşılı ‘Kırmızı’ Antepfıstığı (Pistacia vera L.) çeşidinde azotlu ve fosforlu gübrelemenin verim, bazı meyve özellikleri, hormon konsantrasyonları, periyodisite üzerine etkilerini belirlemek amacıyla 3 yıl .
