Archive image from page 21 of Decomposition of green manures at. Decomposition of green manures at different stages of growth .. decompositionofg00mart Year: 1921 154 Bulletin 406 increase in the availability of the plant nutrients in soil may be measured by the growth of crops, it is reasonable to conclude, from the foregoing data, that the increased crop yields from the soils receiving the more succulent manure were due to an increase in the availability of the nutrients in the soil. CONSIDERATION OF EXPERIMENTAL ERROR In order to determine the degree of significance of the data just prese
Archive image from page 21 of Decomposition of green manures at. Decomposition of green manures at different stages of growth .. decompositionofg00mart Year: 1921 154 Bulletin 406 increase in the availability of the plant nutrients in soil may be measured by the growth of crops, it is reasonable to conclude, from the foregoing data, that the increased crop yields from the soils receiving the more succulent manure were due to an increase in the availability of the nutrients in the soil. CONSIDERATION OF EXPERIMENTAL ERROR In order to determine the degree of significance of the data just presented, and also to obtain a check on the accuracy with which the various analyses 33- 30' 25' C 20- 13- 10- ffie Oafs 'Buckty/7eat 0_. B Fig. 35. SERIES 1918. effect on growth of a subsequent wheat crop produced BY THE incorporation IN THE SOIL OF GREEN MANURE AT VARIOUS STAGES OF maturity and THE SUBJECTION OF THE MIXTURE TO A FIVE-MONTHS INCUBATION PERIOD The green manure at each stage came from equal soil areas (Data given in table 9) were performed, it was considered necessary to calculate the experimental error for the data obtained. This was done by finding the arithmetical mean values of the dry matter humified, of the nitrogen nitrified in the green manure, and of the total crop grown on the soils variously treated. The first two sets of means were expressed in percentages, the third in grams of dry matter produc-ed. The probable error of these mean values
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Keywords: 1900, 1920, 1921, _ithaca_, archive, biodiversity, book, bookauthor, bookcentury, bookcollection, bookcontributor, bookdecade, bookpublisher, booksubject, bookyear, drawing, fedlink, green_manuring_from_old_catalog_, historical, history, illustration, image, library_of_congress, martin_thomas_lysons_1885_from_old_catalog_, page, picture, print, reference, the_library_of_congress, vintage
