Just got back from 10 day holiday and healthy tomatoes are now looking sad. The new growth has gone very pale and ends of leaves turning brown. Older bottom growth still deep green and fine. Each plant was planted in bucket full of home made compost and 2 big handfuls of home made worm castings. And fertilised twice with a weak worm wee solution. I even resorted to a tomato chemical fertiliser over a week ago out of desperation, about 30 plants all together and all but the 4 hydroponic plants have varying stages ofthis prproblem, some has died completely.
Anyone shed any light on this please? Ph? Magnesium? Everthing else in the garden doing great.

Thanks
Dan

It might not be a lack of iron in the soil, but something else interfering with the plant's uptake of iron.... Too much potassium, zinc, or copper can do that. High pH can also be a problem.

I'm not clear on the timing of the yellowing and of the chemical fertilizer. Had the yellowing begun before your holiday, or did you only notice it on your return? Was the fertilizer applied before you noticed the problem or after? If after, did it have any effect on the yellowing? And what's in that fertilizer?

[This is about as far as I can go. Someone else will have to tell you what to do about it.]

u should buy a ph soil testing kit, can get them at Bunnings for about $20. if soil ph is too high (alkaline) you'll need to add some elemental sulpur.

good luck!

Cheers

Dan

Cheers
Dan