Overcoming the unavailability of phosphorus in high soil pH by phosphorus foliar spray in pistachio (Pistacia vera L. 'Kalleh-Ghoochi')
One would expect foliar applied phosphorus (P) to have higher use efficiencies than when applied to the soil, but limited information is available concerning this. Therefore, this study was carried out in order to determine the effects of P foliar application on some fruit characteristics in pistachio (Pistacia vera L. 'Kalleh-Ghoochi'). Different types of P fertilizer (liqufos, phosphoric acid, urea phosphate, monopotassium phosphate and water (as control)) were applied at different stages of nut growth (T1: completion of endocarp and endocarp ossification, T2: embryo completion, endosperm digestion and formation of cotyledons, and T3: both times (T1+T2)). The results showed that the efficiency of P foliar application slightly increased with increasing of number of spraying, as the twice sprays was more effective. It was found that splitting percentage and leaf P content significantly increased in response to P foliar application, whereas number of seeds per ounce significantly decreased. Moreover, no significant difference was observed between the P foliar applications and spraying times on leaf total chlorophyll content and blank nut percentage. Therefore, P foliar application could be a recommended treatment in growing 'Kalleh-Ghoochi' pistachio to change fruit quality.
Hasanpour, H., Bakhshi, D. and Hokmabadi, H. (2018). Overcoming the unavailability of phosphorus in high soil pH by phosphorus foliar spray in pistachio (Pistacia vera L. 'Kalleh-Ghoochi'). Acta Hortic. 1190, 183-188
liqufos, monopotassium phosphate, phosphoric acid, splitting percentage, urea phosphate