Beginner Gardening: Help with container Zucchini/Butterbush, 1 by jminator22

jminator22 wrote:
Here is a picture of my other squash plants that are in a raised bed. This soil is a 50/50 mix of the Kellogg soil described above and last years soil/compost mix. Tomatoes/peppers were grown in last year's soil. The two on top are dark star zucchini, and the two on the bottom are yellow crookneck. One plant is doing very well, with large dark green leaves. The others are struggling much like the ones in containers. Should the dark star leaves be getting this large and dark green as well? They seem to be getting to be about 2 inches before starting to yellow. Would a foliar spray of fish emulsion help me to determine if there is a nitrogen deficiency?