Red stems is it just nitro or something more sinister?(detailed pics)

Hey everybody , second time grower first real issue, im in a new province and that means conditions have changed its a bit colder here and i dont get as much sun, using black earth topsoil with lots of old rotting trees mixed in with clay bits(ive removed them just want you guys to have an idea of the soil) nice soil as far as i can see and its growing all my veggies real well. But Ive got red stems and slow growth,with yellowing lower leaves (see pictures) ive just added lama manure in case its a nitro problem. But i would like to start more seeds with the same soil/manure mix but i want to make sure its not some thing else. Im not ph testing my well water i know thats a nono, but im kinda guerrilla gardening here and if i can avoid the cost of tests and chem fertilizers i can afford my meat for the bbq haha. Any feedback is greatly appreciated. Oh and i know my guys are kinda close together i am going to start gently tieing them apart so thell be okay when they mature.

first, some strains can have what you are describing. check and make sure whether that's the case. and purple stems is a phosphorous deficiency. nitrogen deficiency is usually yellow spots on the leaves.

b4ds33d said:

first, some strains can have what you are describing. check and make sure whether that's the case. and purple stems is a phosphorous deficiency. nitrogen deficiency is usually yellow spots on the leaves.

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oh shit thanks man, so ill work on phosphorous. no idea the strain there clones from a friend of a friend im starting super silver haze and jack herer from seed (germinating as we speak) the soil will be better balanced , wondering if you would recommend a specific npk ratio?