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What are common causes of these burnt tips?

Over/under fertilization? Too much/little light? Nutrient deficiency?

This is Korean shiso/perilla growing in a deep water culture. I've also seen it on basil grown in soil.

Burnt tips on shiso

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It looks like nitrogen and potassium deficiency to me.

From Chapter 4, Soil fertility and crop production of the book Plant Nutrition for Food Security - A guide for integrated nutrient management published by the Food and Agriculture Organization of the United Nations:

Deficiencies indicated by symptoms appearing first on older leaves

  • chlorosis starting from leaf tips, later leaves turn yellowish-brown: N
  • reddish/purple discoloration on green leaves or stalks: P
  • leaves with brown necrotic margins and/or spots: K
  • stripe chlorosis, mainly between veins, while veins remain green: Mg
  • spot necrosis: greyish-brown stripe-form spots in oats (grey-speck disease): Mn
  • dark-brown spots in oats and barley, whitish spots in rye and wheat: Mn

Deficiencies indicated by symptoms appearing first on younger leaves:

  • completely yellowish-green leaves with yellowish veins: S
  • yellow or pale yellow to white leaves with green veins: Fe
  • youngest leaf with white, withered and twisted tip: Cu
  • yellowish leaves with brownish spots and/or leaf deformed (part of acidity syndrome): Ca
  • Any references for more info? Awesome answer @Randy! – Brian Low Sep 8 '13 at 1:18

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