Cause of Yellowing leaves?

I had to flush my plants out last Friday an broke my ph meter In the process so I haven't gavey plants any nutes since Friday,I've noticed the leaves are yellowing quite quick..is this due to not giving them any nutes?also will they recover when I start giving them nutes again? (Which will be today)

are the tops healthy looking? is it the lower larger fan leaves yellowing?

works in a tight spot

go go kid said:

are the tops healthy looking? is it the lower larger fan leaves yellowing?

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The buds look healthy mate its just the leaves..heres a pic so you can see..

It will happen due to moisture and over-watering...

you got some nute burn on the tips. looks like yellowing from lack of N, but not sure as the lower leaves are still green, i know that the tops of plants finish b4 the lower ones by about a week.
leave it to someone else to chime in

go go kid said:

you got some nute burn on the tips. looks like yellowing from lack of N, but not sure as the lower leaves are still green, i know that the tops of plants finish b4 the lower ones by about a week.
leave it to someone else to chime in

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I agree with you I think it's cause a lack of N.. since my pH meter broke they haven't had any nutes an it's happened since then.. theyyve had nute burn for ages haha