Water And Fertilizer Issues

We typically see yellowing of leaves in response to over or under watering, and/or nutrient deficiencies. Water should be applied when needed (according to weather conditions and plant size) rather than on a fixed schedule. When applied, water deeply (fewer times per week as opposed to daily) and maintain even soil moisture (avoid fluctuations in very dry and very wet/flooding of soil). Insufficient water dries out roots, and too much water drowns roots; both situations result in a lack of nutrient uptake. We’ve included a link about Cucumbers so you can refer to this for appropriate fertilizer applications. If watering is done properly and leaves are still yellow you can use this rule of thumb: uniformly yellow lower/older leaves means a lack of Nitrogen. Yellow areas between the veins on newer leaves (at the top of the plant) results from a lack of Iron. We recommend you ask your local garden center professional for an appropriate fertilizer. Here’ the link:
http://www.ipm.ucdavis.edu/PMG/GARDEN/VEGES/cucumbers.html