Why are my cucumber plants turning yellow and wilting? What is missing in the soil?
Yellowing leaves or plants can be due to watering issues; too much or too little, pests, disease, nutrient issues or environmental.
A soil test is the only way to determine if you have a nutrient issue or if the soil needs amendment. Your County Extension Office can help with a soil test for just a few dollars.
These links will help you with care requirements and will help you access the plants.