Effects of potassium fertilisation on late potato blight and yield - short communication

Abstract

Kowalska J., Drożdżyński D. (2018): Effects of potassium fertilisation on potato late blight and yield -short communication. Plant Protect. Sci., 54: 87-91.Potato yields and infestation by P. infestans are related to the supply of potassium. Potassium was applied as soil fertilisation combined with split foliar applications or only as split foliar treatments at a maximum dose of 150 kg/ha K 2 O in both strategies, Lord and Ditta cultivars were used. Additionally, water spraying was included as an alternative treatment in order to maintain uniform moisture in the rows of plants. Plants fertilised with foliar spraying only were more infested than plants fertilised with combined methods. The fertiliser increased the protection impact of copper treatments against P. infestans. This may suggest a possible synergistic effect in reducing the symptoms of the disease, however not always statistically significant in both cultivars. Plants sprayed with water but without soil application of fertiliser showed a statistically significantly higher infestation rate, both in Lord and Ditta cultivars, compared to plants with soil application of fertiliser but without watering.

Effect of Different Forms of Silicon on Growth of Spring Wheat Cultivated in Organic Farming System

“…The application of silicon can be component of integrated plant management and be applied with other plant protection practices, especially in organic farming where only limited plant production means are allowed. Fertilization of organic crops is a key element contributing to the health of plants, through the appropriate strategy of providing key ingredients for a crop can indirectly limit even the symptoms of the disease, as was demonstrated by the study Kowalska and Drożdżyński [14] on reducing the symptoms of late blight potato fertilized with potassium.…”

Environmental and Agronomical Factors Limiting Differences in Potato Yielding between Organic and Conventional Production System

“…In our research, Trichoderma fungus was used, which slightly limited the spread of the disease. In the research of Kowalska et al [94], in field trials, a possibility of limitation of potato late blight by Trichoderma asperellum as well as its influence on vitality of plants and yielding was assessed. In experiments the tested fungus to soil and leaves was applied.…”