Tomato plant leaves are yellowing slightly

kiwimama

My 'beefeater' tom plants have been in the glass greenhouse for about a week now, I ran out of space for them inside and they got to large for their pots so I hardened them off and then planted them in their grow bags in the greenhouse. But I have noticed that the older leaves are slightly yellow - does anyone know what this might mean off the top of their heads? The new growth is lush and healthy but the bottom / oldest leaves are looking slightly blah, I'm guessing overwatering or they ran out of nutrients in the pot they were in before I planted them in the growbags - what do others think and will this have any last effect on the plants / cropping??

TIA

Chimera

found this on the web.. mine are doing similar, but it appears to be nothing to worry about

If you only see a few yellow tomato leaves toward the bottom of the plant, you have nothing to worry about. The leaves of tomato plant turning yellow at the bottom of the plant means these leaves probably aren’t getting the nutrients from the soil and aren’t getting sunshine. This especially happens when the plant is more mature and bearing fruit.

smarttart

Hi Kiwimama,
Our's are doing the same so I googled it and it came back saying it was a magnesium deficiency and the cure is Epsom Salts, I bought a tub from the chemist and it cost £1.50. Mind you I haven't used it yet