Inorganic Plant Poisons and Stimulants

Name: Inorganic Plant Poisons and Stimulants
Author: Brenchley, Winifred Elsie

Brenchley, Winifred Elsie

Growth (Plants); Plants -- Effect of poisons on

II. METHODS OF WORKING                                         7
      I. Discussion of Methods                                     7
        1. Water cultures                                          7
        2. Sand cultures                                           8
        3. Soil cultures in pots                                   9
        4. Field experiments                                       9
      II. Details of Methods                                      10

    III. EFFECT OF COPPER COMPOUNDS                               15
      I. Presence of Copper in Plants                             15
      II. Effect of Copper on the Growth of Higher Plants         17
        1. Toxic effect                                           17
          (a) Toxic action of copper compounds alone in water
                cultures                                          17
          (b) Masking effect caused by addition of soluble
                substances to solutions of copper salts           20
          (c) Effect of adding insoluble substances to
                solutions of copper salts                         22
          (d) Effect of copper on plant growth when present
                in soils                                          24
          (e) Mode of action of copper on plants                  25
        2. Effect of copper on germination                        27
          (a) Seeds                                               27
          (b) Spores and pollen grains                            28
        3. Does copper stimulate higher plants?                   28
        4. Action of copper on organs other than roots            30
          (a) Effect of copper sprays on leaves                   30
          (b) Effect of solutions of copper salts on leaves       32
      III. Effect of Copper on Certain of the Lower Plants        33
      Conclusion                                                  35

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Inorganic Plant Poisons and Stimulants

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