Zircon increases resistance to peronosporosis and onion yield
The article presents the research of the biological effectiveness of Zircon-preparation in culture of onion in annual crop under drip irrigation on the background of basic N<sub>90</sub>P<sub>90</sub>K<sub>90</sub> fertilization. It was found that the double processing by Zircon-preparation during the initial period of bulb formation has a significant impact on biometric indicators of plants. It reduces the development of peronosporosis and contributes to higher yield by 10,5-31,9 %, depending on the hybrid. It also increases the persistence of the bulbs. It is shown the perspective of the use of Zircon-preparation as one of the systemic and ecologically safe protecting measures against the downy mildew of onion.