SINCE carrying out this work we have noted that Colonel McCarrison in 1924 published in the British Medical Journal his results on the effect of " artificial" and also cattle manure on the nutritional value of certain grasses. We have also found that G. H. Hunt at Ohio Agricultural Experiment Station in December 1927 performed certain experiments on the effect of what we now call artificial manures on certain wheat plots. We were unaware of this work until a few weeks ago, but we note that our work confirms McCarrison's.This research was undertaken because one of us (M.J.R.) had noticed that pigs which were fed on home grown and home ground barley and wheat always did much better than those pigs which were fed on purchased barley and wheat, and that certain cattle did better on certain fields. It was decided to find out whether this was due to the lack of lime or of other mineral constituents of the land. The results of this investigation were not satisfactory. It was then decided to try the effect of artificial manure versus dung. In this experiment pigs' exereta mixed with straw were used. These pigs were fed on a diet consisting of 10 % of a proprietary product (containing meat meal, rye and wheat embryo which is high in its vitamin B content, bone meal and cod-liver oil), 40 % of barley meal, and 50 % of middlings.Two areas of land were pegged out in the same field, on the same side so that both had the same amount of sunlight. The drainage was equal from both areas. This field had previously been an arable one and had grown cabbages in the fifth year before this experiment was carried out, and in the fourth, potatoes. It was then ploughed up and sown with seeds which were made up to contain a small quantity of the different clovers. These seeds were sown with a nurse crop of wheat in 1927, the wheat having been sown in the previous year, 1926. In 1927 the seeds were cut at the time when the wheat was reaped. The field was lightly fed in the autumn of 1927. In 1928 it was cut for hay and grass. In the autumn of 1928 one portion of the land was dunged at the rate of 20 loads of dung to the acre, which is the usual dressing used by the farmer. The other portion was manured with artificial manure, 20 cwt. basic slag plus 3 cwt. kainite to the acre, and in the spring
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