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Abstract: The cropping of the top beds in a three tier unit was better than the lower ones in the Handcraft houses at Brayton during the summer of 1949. Large bare areas were present in the middle of the beds and in some of these areas a large number of pinheads developed and failed to mature. Poor ventilation conditions have been shown by Lambert (1933) and Mader (1943) to be able to produce similar effects. Crop records are available at Brayton and these have been examined with the object of determining the effect that the type of house has on mushroom production. Further records have been supplied by Mr. F. C. Atkins of the cropping at Noble Mushrooms Ltd. at Yaxley and these cover the crops grown there during the past five years. The following data were extracted from the crop records ; the total weight and time of production ; the date of the first picking and the. number of days required to produce 1, 1|, 2 and 3 lbs. of mushrooms respectively. In most instances details of the type of compost and method of preparation were noted. Records relating to total failures, and to crops grown on synthetic composts were discarded. In all 415 records were available of crops grown on horse manure composts.
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