Scientific Greenhouse Gardening by P. K. Willmott

By P. K. Willmott

Booklet by means of Willmott, P. ok.

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The Jiffy pot, made from peat enclosed within a mesh. the disc on the left; after immersion in water it swells to form the container depicted in the middle of the photograph; and on the right a young begonia is seen well established in one of these. Peat modules in a similar dehydrated condition, convenient to handle and store, are now available. Conversely, it is now known that crocks not only fail to assist drainage, they actually impede it, to say nothing of taking up space better occupied by compost.

This will ensure that the temperature on the bench is closer to the ambient. For all winter work and when a warm temperature around the plants in the staging is required it is always recommended that 'open staging' be provided. In summer, on the other hand, open benches can lead to arid conditions around the pots, to the extent that some growers actually install overhead spray-lines so that they can spray the plants from time to time in order to make them moister and thus cooler. It has been traditional for gardeners to construct solid benches with a floor of flat asbestos sheeting, or for greater strength, corrugated asbestos or galvanised iron.

The thread of the barrel is truncated, thus providing a spiral passage for the water. downwards with its spread reduced or turned upwards to deliver a cascade. In the world of the commercial grower most of this watering art has gone. The hosepipe with or without a choke, or with a rose fitted to it, has almost replaced the can and whenever possible irrigation systems have replaced both. Irrigation systems are of three kinds: capillary systems (dealt with elsewhere), trickle systems and spray lines.

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