تاثیر محلول پاشی منابع مختلف کلسیم بر شدت عارضه لکه پوست استخوانی پسته رقم کله قوچی

This research was carried out in the pistachio orchard of Kale Ghouchi cultivar with a history of Epicarp Lesion Disorder in Rafsanjan city. The treatments were foliar spraying of calcium nitrate fertilizer 2.5 kg, calcium chelate 1 liter, calcium amino chelate 2 liters per thousand liters of water and water spraying and control (without water spraying). The treatments were sprayed in a completely randomized block design, including 5 treatments and 4 replications in late April (when the fruit becomes bean shape) , using a sprayer on the back of a tractor with a normal nazels. 100 clusters from each treatment (25 clusters from each replicate) were randomly picked and the number of healthy fruits and the number of damaged seeds due to Epicarp Lesion Disorder were counted in late May (about a month after treatments). The percentage of each fruits relative to the total number of pistachios in the cluster was calculated. Calcium and magnesium percentage of fruit in different treatments were measured. The data were statistically analyzed using MSTAT software, and comparison of means was done using Duncan's method at the 5% level.The results showed that the least damage ofEpicarp Lesion Disorder was related to calcium amino chelate treatment and the most damage was related to foliar application of calcium nitrate fertilizer. The highest percentage of leaf calcium was observed in foliar application of calcium amino chelate. The lowest percentages related to the foliar spraying treatments with calcium nitrate fertilizer and the control treatment without water spraying were obtained. No significant difference was observed between other treatments. The lowest percentage of fruitmagnesium was related to calcium amino chelate foliar treatment and the highest percentage was related to calcium nitrate treatment.