11. Phenological characteristics of grape varieties of v. Vinifera species, Convar occidentalis negr. Group, in the annual cycle of ontogenesis

Author: Valery Petrov, Sergey Shcherbakov, Aleksandr Kovalenko, Ekaterina Kurdenkova

12. Influence of biological fertilization on the fruit quality of greenhouse tomatoes

Author: Kostadin Kostadinov, Galina Pevicharova, Stoyan Filipov, Krasimir Mihov

18. A dosing device with a compensative chamber for a fertilizer applying machine

Author: Sayakhat Nukeshev, Dimitar Karaivanov, Aigul Balabekova, Boris Gorbunov