Effect of spraying with biofertilizer EM1 and seaweed extract Casper fix on tree crown size and leaf chlorophyll content of "Red haven" peach cultivar.

The study was conducted during the seasons 2021 and 2022 on peach trees, Prunus persica L., cultivar "Red haven", grown in the village of Khirbet Solas in Lattakia Governorate, at an altitude of 500 meters above sea level, The experiment was carried out with 9 treatments and each treatment with three replicates. The results showed the following: he treatment with biofertilizer and seaweed extract (EM1 6 cm3/L + Casper Fix 1.5 cm3/L) gave the highest value of increase in tree crown volume in the two seasons, reaching (2.90 m3) for the first season and (3.85 m3) for the second season compared to the control (0.97 m3). and 0.68 m3), respectively. The percentage of increase in the size of the tree crown was (40.41%) for the first season and (45.94%) for the second season, while this increase did not exceed (15.49% and 15.09%) in the witness during the years 2021 and 2022, respectively. The results of the statistical analysis showed its superiority over all other treatments, including the control. Treatment with (EM1 6 cm3/L + Casper Fix 1.5 cm3/L) gave the highest leaf content of chlorophyll a in the first and second seasons (1.80 mg/g) and (1.81 mg/g) respectively; This treatment also achieved the highest value of leaf content of chlorophyll b during the two seasons (0.79 mg/g and 0.87 mg/g), respectively. The results of the statistical analysis showed that this treatment was superior to all other treatments in terms of the average of the two years (1.80 mg/g). Foliar feeding with the biofertilizer EM1 and seaweed extract Casper Fix increased the percentage of set flowers, both when single spraying or mixed spraying and in all treatments compared to the untreated control; As this percentage ranged between (43.19% and 46.58%) as an average for the two years, while it did not exceed 32.22% in the control. The results of the statistical analysis showed that all treatments were superior to the control, without a significant difference between them.

本研究于2021年与2022年两个生长季，在拉塔基亚省希尔贝特索拉斯村种植的桃树（Prunus persica L.，品种"红港（Red Haven）"）上开展，试验田海拔为500米。试验共设置9个处理组，每组设置3次生物学重复。试验结果如下：施用生物肥料与海藻提取物的处理组（EM1 6 cm³/L + Casper Fix 1.5 cm³/L）在两个生长季均获得最高的树冠体积增长量，第一季达2.90 m³，第二季达3.85 m³，相较对照组（第一季0.97 m³、第二季0.68 m³）分别提升。该处理组的树冠体积增幅率分别为第一季40.41%、第二季45.94%；而对照组两年的树冠体积增幅仅分别为15.49%与15.09%。统计分析结果表明，该处理组显著优于其余所有处理及对照组。该处理组的叶片叶绿素a（chlorophyll a）含量在第一季和第二季分别达1.80 mg/g和1.81 mg/g，为所有处理中最高；同时其叶片叶绿素b（chlorophyll b）含量在两个生长季也分别达到0.79 mg/g和0.87 mg/g，同样为最优水平。统计分析显示，以两年均值计（1.80 mg/g），该处理组同样显著优于其余所有处理。叶面喷施生物肥料EM1与海藻提取物Casper Fix，无论单独喷施还是混合喷施，所有处理组的坐花率均显著高于未喷施的空白对照组；两年平均坐花率介于43.19%~46.58%之间，而空白对照组的坐花率仅为32.22%。统计分析结果表明，所有处理组均显著优于对照组，但各处理组之间无显著差异。