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Fan leaf discolouration

Hello all. I’m Rob and I’m new to this forum and was hoping to receive a bit of advice. I have some outdoor plants that are about 2-3 weeks into flowering. The leaves on mainly one of them are showing some significant discolouration. Some have now also completely yellowed. Was hoping someone could help me figure out what the problem is. Is it a ph thing? Or a mineral deficiency. Thanks guys
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Thanks Bush Doctor 77. This is my first go at growing marijuana. To be honest I don’t have a designated feeding schedule. Usually every 2 weeks or so I have been using worm castings and the liquid to water. Have been trying to achieve “super soil”. I have used no man made fertilizers. Just been keeping it organic. I had to leave the country for a month. Had no one to care for them for that time. The weather was good so I don’t think that had any effect. I just returned home and am now trying to figure it out
 
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