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Proceedings of the International Plant Propagator's Society

Vol. 4


Vincent K. Bailey

pp: 121-128

The discussions you have just heard about mist propagation are an effective method of preventing loss of moisture from the softwood cuttings but there is another method which we have found very effective. I refer to controlled humidity in greenhouses as a means of keeping the cutting in good condition until rooted. We have used this method in St. Paul for the past seven years and we feel that it has some advantages.

As an introduction to our discussion of "Controlled Humidity in Greenhouses". I wish to briefly describe our physical plant. This consists of two greenhouses, one 25' × 100' built about 1938 and another 25' × 116' built in 1942. These houses are heated with hot water boilers using oil.

Our propagation is primarily for the purpose of supplying lining-out stock for our own field planting. I wish to make it plain that we are not producers on a large scale in the way that many of you are accustomed to. As you can see, these two houses are only a fraction the size of the facilities of

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