# Evaluation of the Effect of Biostimulation on the Yielding of Golden Delicious Apple Trees
## 3 Results and Discussion  
The average air temperature during the growing season in successive years of the study was higher than the multi-year average for 1988-2008. It was observed that only in April of 2015 was the average air temperature lower than the multi-year average, while in May, similar relationships were shown in 2008-2010 and 2015, June in 2009, July in 2008, 2011 and 2017, August in 2014, September in 2008, 2010, 2013 and 2017, while in October, in 2009-2010 and 2015-2016. The warmest year of the study was 2012, when the average air temperature in all months of the growing season was higher than the multi-year average, while the coolest year was 2010, whose average temperature from April to October was 14.3 \({}^{\circ}\)C, 0.1 \({}^{\circ}\)C higher than the multi-year average. The lowest average monthly air temperature was recorded in October 2010 (5.6 \({}^{\circ}\)C), while the highest was in August 2014 (22.5 \({}^{\circ}\)C) (Table 1). The sum of precipitation analyzed for the period of April to October between 2008 and 2017 was higher (419.7 mm) than the multi-year average (361.7 mm). The driest years in the analyzed period were 2013 (358.9 mm), 2015 (342.4 mm) and 2016 (237.8 mm), whose precipitation totals were less than the multi-year average. The highest total rainfall was recorded in 2010 (577.2 mm). On average, from 2008 to 2017, the driest month was April, while the wettest month was July. The lowest precipitation was recorded in April 2009 (7.6 mm), while the highest was in May 2010 (168.4 mm) (Table 1). Based on the obtained results, it was shown that the application of technology based on seaweed extracts had a significant effect on the yield and quality of Golden Delicious apple trees. Table 2 presents the differences between the applied fertilization technologies, regardless of the year of research (A), and in the next part, in particular years of research, regardless of the applied fertilization technology (B), and presents the integration of the factor of the year of research and fertilization technology (A \(\times\) B). Statistical analysis showed that trees treated with seaweed extracts had higher number of apples per tree, percentage of fruit with a diameter of more than 7.5 cm and average fruit weight compared to the control. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**Air Temperature, \({}^{\circ}\)C**} \\ \hline  & **IV** & **V** & **VI** & **VII** & **VIII** & **IX** & **X** & **Average from** \\  & & & & & & & & **April to October, \({}^{\circ}\)C** \\ \hline
2008 & 9.4 & 13.5 & 18.2 & 18.8 & 18.9 & 12.7 & 9.8 & 14.5 \\
2009 & 11.1 & 13.7 & 16.6 & 20.2 & 18.5 & 15.1 & 7.2 & 14.6 \\
2010 & 9.4 & 14.0 & 17.8 & 21.2 & 19.5 & 12.3 & 5.6 & 14.3 \\
2011 & 10.8 & 14.3 & 18.5 & 18.1 & 19.0 & 15.5 & 8.0 & 14.9 \\
2012 & 9.9 & 15.2 & 17.9 & 21.2 & 19.1 & 14.9 & 8.2 & 15.2 \\
2013 & 9.0 & 15.1 & 18.3 & 19.5 & 19.5 & 12.2 & 10.3 & 14.8 \\
2014 & 10.8 & 14.5 & 17.2 & 20.9 & 18.3 & 14.8 & 9.2 & 15.1 \\
2015 & 8.5 & 13.2 & 17.3 & 20.1 & 22.5 & 15.4 & 7.3 & 14.9 \\
2016 & 9.5 & 14.7 & 19.1 & 19.4 & 17.8 & 15.6 & 7.3 & 14.8 \\
2017 & 7.6 & 14.1 & 18.7 & 18.7 & 19.6 & 13.3 & 9.0 & 14.4 \\ \hline \multicolumn{6}{c}{Average temperature of the} \\ \multicolumn{6}{c}{month, \({}^{\circ}\)C} \\ \hline Mean (1988–2008) & 8.8 & 14.2 & 16.9 & 19.1 & 18.4 & 13.4 & 8.6 & 14.2 \\ \hline \multicolumn{6}{c}{Total precipitation, mm} \\ \hline  & IV & V & VI & VII & IX & X & \(\sum\) precipitation, mm \\ \hline
2008 & 59.0 & 74.3 & 29.4 & 99.4 & 31.0 & 83.3 & 36.8 & 413.2  
The number of apples per tree ranged from 114.8 to 169.5 and differed significantly 204 between the evaluated study years. It was shown that in 2015 the trees of the Golden Delicious variety had significantly the most apples throughout the study cycle, not depending on the fertilization combination used. Significantly the trees had the least fruit in 2010. The year 2010 was the coldest and wettest in the entire research cycle which had a direct impact on fruiting.