INFLUENCE OF POTASH
Several cases are quoted from current literature in which potash fertilisers increased the resistance of crops to injury by frost, says an exchange. A. Arland, Leipzig, has observed that the younger leaves show a greater resistance to frost injury than the older, and he emphasises the similarity between the type of injury produced by frost and that caused by drought. As a result of his investigations he assumes that the lower resistance to frost observed in plants receiving insufficient potash is due to an increased loss of water by transpiration. He maintains that the increase in resistance produced by potash manuring cannot be caused by increase in the salt content, and a consequent lowering of the freezing point of the cell sap, as the effect of potash in this respect is very slight. Potash manuring tends to reduce the loss of Water to the plant by transpiration, arid thus to prevent the drying up of the plant tissues, and it is to this fact that he ascribes the greater resistance of plants manured with potash lo injury by frost.
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https://paperspast.natlib.govt.nz/newspapers/NEM19320616.2.122
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Nelson Evening Mail, Volume LXVI, 16 June 1932, Page 8
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182INFLUENCE OF POTASH Nelson Evening Mail, Volume LXVI, 16 June 1932, Page 8
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