The results of the growth regulator “Regalis” application of in the intensive apple orchards

The aim of the research was to study the effect of the growth regulator “Regalis” on the length of annual shoots and yield of different apple varieties. The research was done in apple orchards planted in the year 2011 in JSC “Agrofirmaimeni 15 let Oktyabrya” in the Lipetsk region. Objects of research: apple trees of the next varieties: Bogatyr, Rozhdestvenskoe and Zhigulevskoe. There was observed the variety response to the application of the growth regulator “Regalis”. The most responsive to treatments were the varieties Rozhdestvenskoe and Zhigulevskoe. The use of growth regulator Regalis treatments promoted to the decrease of the length of annual shoots. This was particularly evident in the spring of 2016, which was characterized by abundant precipitation. Double treatments of apple trees with the growth regulator “Regalis” in 2016 were more effective compare to 2014-2015. The decrease of shoot length on the variety Bogatyr trees was 48,1 % (“Regalis” 1.25 kg/ha + 1.25 kg/ha) and 63,2 % (“Regalis” 1.25 kg/ ha + 0.75 kg/ha); on the variety Rozhdestvenskoe – 55.0 and 60,6 %; the variety Zhigulevskoye – 64.2 and 67.9 %. On trees of the variety Bogatyr the decrease of the length of shoots was 18.9 and of 28.0 % (2014); 40.7 and 58.4 % (2015). On plants of the variety Rozhdestvenskoe – 32.3 and 24.1 %; 33.6 and 51,9 %; the Zhigulevskoye – 46.0 and 40.4 %; 39.9 and 48.6 %, respectively by years. There was noted the tendency of annual yield increase of fruits in apple orchards with application of the growth regulator Regalis. The yield increase by using the growth regulator Regalis with an application rate 1.25 kg/ha + 1.25 kg/ha was from 9.8 to 118.3 c/ha depending on the variety. The most yield increase was obtained in the treatment with the use of the growth regulator Regalis with the application rate1,25
kg/ha + 0.75 kg/ha. The yield increase was on variety Bogatyr 25.1, 23.4 and 28.3 c/ha; on variety Rozhdestvenskoe 33.3, 120.6 and 85.0 c/ha; on variety Zhigulevskoye – 75.0, 91.6 and 28.3 c/ha, respectively by years. The lowest yield increase was observed in 2014 on the variety Bogatyr and was to 9.8 c/ha, and in 2015 in the Zhigulevskoye variety – 16.7 c/ha with the use of “Regalis”, application rate – 1.25 kg/ha + 1.25 kg/ha.

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