Biology 2601A/B Lecture Notes - Lecture 16: Depletion Region, Crop Yield, Phloem

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Lecture 16 - water and nutrient absorption 2: root structure and function. So far we"ve been talking about how plants get carbon, oxygen and hydrogen: but you need other elements as well. Figure 5. 1: plants are mostly made up of carbon and oxygen. If (cid:455)ou a(cid:396)e a fa(cid:396)(cid:373)e(cid:396) (cid:455)ou do(cid:374)(cid:859)t (cid:449)a(cid:374)t to d(cid:396)op (cid:271)elo(cid:449) these le(cid:448)els: adequate zone, does(cid:374)(cid:859)t (cid:373)atte(cid:396) (cid:449)hat the (cid:374)ut(cid:396)ie(cid:374)t (cid:272)o(cid:374)(cid:272)e(cid:374)t(cid:396)atio(cid:374) is i(cid:374) the pla(cid:374)t, its (cid:374)ot affe(cid:272)ti(cid:374)g g(cid:396)o(cid:449)th, e(cid:454)a(cid:373)ple; (cid:373)o(cid:396)e (cid:374)it(cid:396)oge(cid:374) does(cid:374)(cid:859)t (cid:373)ea(cid:374) (cid:271)ette(cid:396) g(cid:396)o(cid:449)th. Just stores the nutrients, just in case where it needs nitrogen in a couple years: you can build up some of the concentration, toxic zone, concentration of nutrients is too high. If you"re a farmer you would fertilize more to the right of the graph. If (cid:455)ou do(cid:374)(cid:859)t put e(cid:374)ough o(cid:374) the(cid:396)e (cid:449)ill (cid:271)e a sha(cid:396)p de(cid:272)(cid:396)ease i(cid:374) (cid:455)ou(cid:396) (cid:272)(cid:396)op (cid:455)ield. If you put a little too much on, it wont kill the crop.

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