. Principles of agricultural chemistry [microform] . me receive bene-fit from liming, while others do not. The Rhode Island Experi-ment Station^ has conducted a large number of experiments onan acid soil, limed and unlimed, with the addition of acid phos-phate, muriate of potash and sulphate of magnesia, and nitrate ofsoda or sulphate of ammonia. These experiments, begun in 1893, ^ See their reports and bulletins; also Veitch, Bulletin 90, p. 183, BureauChemistry, U. S. Dept. Agr.; Bulletin No. 66, Maryland Exp. Sta. SOIL DEFICIENCIES 251 were conducted upon permanent experiment plots of the R
. Principles of agricultural chemistry [microform] . me receive bene-fit from liming, while others do not. The Rhode Island Experi-ment Station^ has conducted a large number of experiments onan acid soil, limed and unlimed, with the addition of acid phos-phate, muriate of potash and sulphate of magnesia, and nitrate ofsoda or sulphate of ammonia. These experiments, begun in 1893, ^ See their reports and bulletins; also Veitch, Bulletin 90, p. 183, BureauChemistry, U. S. Dept. Agr.; Bulletin No. 66, Maryland Exp. Sta. SOIL DEFICIENCIES 251 were conducted upon permanent experiment plots of the RhodeIsland Station. Air slaked lime was applied in 1893 to two of theplots at the rate of 5,400 pounds per acre, and 1,000 pounds in 1894,and none since. Equal quantities of potash, phosphoric acid, andnitrogen have been applied annually to each plot, and, since 1899,sulphate of magnesia. Two of the plots receive nitrogen as sul-phate of ammonia, and two as nitrate of soda. The tendency ofthe two plots which receive sulphate of ammonia is to become. Fig. 60. —Bare spot in barley caused by acid soil. Woburn, England. acid, since removal of the nitrogen leaves sulphuric acid; whilethe latter two plots tend to become basic, since the residue leftis soda. Equal numbers of plants were set out on each plot. A greatnumber of different crops have been grown at various times. Afew results are as follows: Plotnumber Treatment Asparagus(pounds) Barley (pounds) Onion(pounds) Turnip(pounds) 23252729 Sulphate of ammonia Sulphate of ammonia limed 4-7 7-5 44-3 Nitrate of soda limed 252 ;s of agriculturai. chemistry The acid soils (Nos. 23 and 27) give smaller yields with thesecrops than the limed soils. The nitrate of soda plot, which, asstated, has a tendency to become basic on account of the basicresidue left when the nitrogen is taken up, gives better yields thanthe ammonium sulphate plot, which has a tendency to becomeacid. Eff
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