Evaluation of mineral fertilizers influence on raspberry yield

The paper presents the results of studying the effect of fertilizers on the development and fruiting of raspberry varieties Novost' Kuz'mina and Solnyshko during the growing seasons of 2019-2021. The study was carried out in the soil and climatic conditions of the forest-steppe zone of the Cis-Urals of Bashkortostan. The planting was laid in the autumn of 2016 according to the scheme 0.5×3.0 m. The following fertilizers were used: humus 25 t/ha; ammophos 2c + potassium chloride 1c/ha; ammophos on zeolite 2 q/ha; ammophos on zeolite 1 centner/ha; calcium dimonophosphate 2 q/ha; chlorine-free ROS 2 c/ha; zeolite 1.5 c/ha, which were applied once. The application of fertilizers contributed to an increase in the winter hardiness of raspberries, freezing of shoots was not observed, the death of raspberry buds (by 10.5 and 17.3 %) was noted in the winter of 2019/2020. In 2021, the dry conditions of the growing season led to a decrease in yield. It was established that the use of fertilizers had a positive effect on the vegetative-reproductive formations of raspberry varieties: when chlorine-free N14P22K27 (2 c/ha) was applied, the shoot-forming ability increased by 5.8-8.3 %. Ammophos N12P50 on zeolite (2 c/ha) had the greatest impact on the number of branches and the number of berries on the lateral - by 15.7 and 31 %. For 3 years of research, due to the introduction of ammophos N12P50 on zeolite (2 q/ha), the efficiency of the Novost' Kuz'mina variety exceeded 31.8 %. In variety Solnyshko, the use of chlorine-free N14P22K27 contributed to an increase in productivity (2 q) by 28.1 %.