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view:23141   Last Update: 2021-2-21

Taher Barzegar

مجتبی دلشاد، طاهر برزگر ، عبدالکریم کاشی و کمال‌الدین حق‌بین
مطالعه اثر محل نگهداري ميوه روي ساقه بر خصوصيات كمي و كيفي ميوه در دو توده خربزه ایرانی تحت شرایط عادی و تنش كم آبي
Effect of fruit position on yield and fruit quality of two Iranian melons under normal and water stress conditions

This study was conducted at the Research station of Horticultural Science (University of Tehran, Karaj) to investigate the effect of different irrigation levels and fruit position on sink-source relationship, yield and fruit quality of two Iranian melon cultivars. The statistical design was a split split-plot with 3 replications. Treatments consisted of factorial arrangement of three Irrigation levels (starting irrigation at -50, -65 and -75 cbar), four thinning levels (maintaining of fruit in second, fourth or seventh node of each of two secondary stem and control plants without thinning) and two cultivars of Iranian melons (Zard Jalali and Suski Sabz). Results showed that water stress reduced fruit weight and yield. The lowest fruit weight and yield was obtained in severe stress (-75 cb). Thinning methods had significant effect on mean fruit weight and yield. The highest values were obtained from fruit kept on 7th node treatments. “Zare Jalali” had higher fruit dry matter (%) and flesh firmness compared to “Suski Sabz”. First water stress increased total soluble solid (TSS) content. Maintaining of fruits on 7th node resulted in the highest amount of TSS (10.77%). Water stress caused a significant decrease in ripening time about 7 days. Maintaining of fruit on 2th node caused earlier ripening of fruits. Water stress reduced photoassimilate production and improved fruit sweetness. Also, water stress and thinning affected fruit ripening. 



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