. Basic slags and rock phosphates . s for the periodMay 1st till harvest are tabulated with the yield of hay on the un-treated plot, as is the case in Table XLVII, it wiU be seen that, withone or two exceptions which can be readily accounted for, there isa very close connection between the two sets of figiu-es. The rainfall figures have been taken from the records of the BritishRainfall Organisation. Their station at Havering-atte-Bower is withintwo miles of each of the first three experimental centres. At Hasso-bury there is a rainfall station on the farm, whilst at Saffron Walden ON THE YIEL
. Basic slags and rock phosphates . s for the periodMay 1st till harvest are tabulated with the yield of hay on the un-treated plot, as is the case in Table XLVII, it wiU be seen that, withone or two exceptions which can be readily accounted for, there isa very close connection between the two sets of figiu-es. The rainfall figures have been taken from the records of the BritishRainfall Organisation. Their station at Havering-atte-Bower is withintwo miles of each of the first three experimental centres. At Hasso-bury there is a rainfall station on the farm, whilst at Saffron Walden ON THE YIELD OF HAY 91 and Latchingdon the respective rainfall stations are within from twoto four miles of the experimental centres. The curve representing the correlation of the hay yield with therainfall at Saffron Walden is a very steep one, and shows quitedistinctly that rainfall is the most important factor. At Tysea Hill and Martins Hearne even a high rainfall from the1st of May till harvest of 9-34 inches and 11*51 inches respectively. 10 12 4 6 8 Inches of Bainfall, May 1 till HarvestFig. 24. Influence of Rainfall on the Yield of Hay on the Untreated Plots at ~ -©, and Cockle Park ■ Wendens Butterfields produce crops of only 38-3 cwts. and 23-4 cwts. The manurial factoris clearly of greater importance at these two centres and particularlyat Martins Hearne. The curves are not nearly so steep as at SaffronWalden, and there is a much greater response to manuring. At Latchingdon the rainfall has more influence on the crop thanat Martins Hearne or Tysea Hill and less than at Saffron was difficult to get any correlation between the rainfall and the 92 EFFECT OF RAINFALL yield of hay on the untreated plot at this centre. Owing to a wetJuly in 1918 and 1920 the crops had to remain uncut during a spellof wet weather, which had little or no influence on the growth ofthe crop. In order to overcome this difficulty the rainfall figuresfrom 1st May to June 30th have been taken for
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