after viewing the abbove.. i still am not quite sure whats wrong with my plant. . its a sativa from a seed directly in the ground , also live in n. cal so its getting a good amount of heat-sunlight..it has been healthy from a baby until now in the last few days the newest leaves are yellowing , and also the oldest leaves at the very bottom ..but i havent gave them any thing but water, sun , and love for about 2 months so i doubt its the nutrients from 2 mnths b4 ...do i maybe need to start feeding again? are they just hungry... maybe the heat ?it is in the 100+ . Help?

pic 1 and 2 is about week n a half ago
three and 4 is today

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