What is wrong with my green beans
I built 3 4'x8'x18" raised beds. In one we planted a row of green beans (about 4-6 weeks ago). They shot up in no time and were looking really good. Soon there after, I constructed a trellis for them of jute and they loved it - grabbed right on and started growing - for about a week. Then, they turned light green and are now nearly yellow and all growth has come to a halt. They are watered from a drip irrigation system that I installed, though for the first few weeks they were watered by hand. I did not mulch them, because I heard somewhere that mulching a vegi garden is not a good idea. They don't get 100% sun, they are in shade in the morning, but do get 6-8 hours of full sun. They are planted in organic growers' mix: decomposed organic compost, lava sand, Texas Greensand, and a soil/sand mixture.
Can anyone tell me where I went wrong and why the crop failed?