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By P. K. Willmott
Publication by way of Willmott, P. ok.
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Extra resources for Scientific Greenhouse Gardening
Liquid feeding is generally the most convenient method and will be discussed later when dealing with the various crops. All 'growing media' as composts are frequently called must provide the correct physical conditions for root growth. If these are not correct no amount of fertiliser treatment can compensate. Experiments have shown that in a compost, with a sub-standard physical condition, the difference in plant growth between a low standard of nutrition and a high one is no more than 12 per cent whereas with a compost of good physical condition, the difference rises to 91 percent.
It was thought at one time that it would prove the answer to the problem for amateur and professional alike, but in the event it proved impossible to maintain the parasite population in small greenhouses. g. Resmethrin) is thai known as the synthetic pyrethroids. These are proving very successful against whitefly, and are now available in small packs for amateur gardeners. Since the advent of peat composts and capillary beds, sciarid fly or fungus gnat has become a serious pest of plants in containers.
If the side walls are required to be higher the ridge should be raised by an equal amount. If timber is used for construction it should, for preference, be pressure-treated, otherwise painted liberally with a copper preservative such as Cuprinol. (See Fig. ) The frame, single or span, obviously can be of any length, but if it can be about the same as that of the greenhouse it accompanies, it will normally be adequate. ridge capping ridge board n 9ft Sin Fig. 29: double Dutchlight span frame. 54 A careful experiment at Stockbridge House Experimental Horticulture Station, Cawood, Yorkshire, in the early 1950s, showed surprisingly little difference in the winter growth of lettuces in span frames orientated in various directions.
Scientific Greenhouse Gardening by P. K. Willmott