When examining the plantings, summer residents notice that yellow spots appear on the top of the onion feathers.
Experienced gardeners have identified three key reasons why this happens.
Deficiency of elements
First of all, we are talking about nitrogen. This macronutrient is responsible for the growth of green mass. When there is a shortage of it, plants turn yellow.
But you shouldn't focus on nitrogen fertilizers alone. Phosphorus and potassium are also valuable elements, so it's better to apply complex fertilizers.
Onion rust
When affected by rust, feathers do not dry out, but are covered with reddish spots. The disease can appear if juniper grows nearby.
To make the onion resistant to the disease, the sets need to be warmed up before planting. The crop should be planted without excessive thickening. Diseased plants are removed immediately to prevent spreading.
Pests
Onion maggots and thrips can also cause yellowing. Pests are destroyed with insecticides.
