Chemical investigations of the effect of fertilizer ratios and green manures on yields and composition of crops and the organic matter in Norfolk sand

dc.contributor.author Adams, James
dc.contributor.department Chemistry
dc.date 2018-08-23T17:07:54.000
dc.date.accessioned 2020-06-30T07:27:27Z
dc.date.available 2020-06-30T07:27:27Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 1936
dc.date.issued 1936
dc.description.abstract <p>The data presented have been obtained from a combined field and laboratory study conducted on Norfolk sand; this type of soil is prevalent throughout the sand-hill region of the Carolinas and Georgia. Investigations concerning the relative efficiencies of fertilizers and crop residues as sources of nitrogen for corn and cotton have been made. These involved a comparison of legumes used as green manures; i.e., soybeans, velvet beans, and cowpeas, with only the stubble turned; a low-nitrogen fertilizer was applied to the crops grown on the green manure plats, while a high-nitrogen ratio was used on the stubble plats. These two systems of management were used in a rotation of legumes, corn and cotton. Winter fallow following cowpeas was compared with a winter cover;Yields data were obtained, and the carbon and nitrogen status of the soil was determined semi-annually during the two rounds of the three-year rotation;The foregoing study of the effect of a rational soil management and cropping program on the quantity of the crops produced, and the organic matter content of the soil, was in conjunction with an intensive study of the effect of 21 fertilizers of varying ratio, as dictated by the triangle system, on the composition (quality) of soybean hay and seed. The use of the residues under the three systems of management; i.e., (1) the turning of the crop as a green manure, (2) the turning of the mature hay after the seed had been removed, and (3) the turning of the stubble, allowed the study of the combined effect of fertilizers and residues on the organic matter and the pH of the soil;Yields of seed and hay were obtained for the period 1928 to 1933, inclusive. The seed were analyzed for nitrogen and oil during the period 1929 to 1933. The following components of the hay were determined during a four-year period: (1) nitrogen, (2) phosphoric anhydride, (3) potassium oxide, and (4) calcium oxide; soluble ash, R2O3, Mn 3O4, sulphur, and magnesium oxide were determined during a three-year period;These studies have provided information regarding some fundamental problems associated with a fertility program for the Norfolk sand.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/13267/
dc.identifier.articleid 14266
dc.identifier.contextkey 6935945
dc.identifier.doi https://doi.org/10.31274/rtd-180813-14630
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/13267
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/66726
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/13267/r_DP12185.pdf|||Fri Jan 14 19:48:30 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Biogeochemistry
dc.subject.disciplines Soil Science
dc.subject.keywords Sand
dc.subject.keywords Green manuring
dc.subject.keywords Crop rotation
dc.subject.keywords Fertilizers
dc.subject.keywords Soybean
dc.subject.keywords Manures
dc.subject.keywords Soil chemistry
dc.title Chemical investigations of the effect of fertilizer ratios and green manures on yields and composition of crops and the organic matter in Norfolk sand
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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