Untersuchungen über Lagerung und Wirkung von Stalldünger. Teil V: Feststellung der Stoffumsetzungen im Kaltmist mit Hilfe der „Profilmethode”︁ bei viertägiger bis sechsmonatiger Rottungszeit

I. The effect of acid concentration and time of hydrolysis on the amount of nitrogen dissolved from sewage sludge and composts was investigated. The amounts of a-aminonitrogen and ammonia-nitrogen in solution were determined.2 . The amount of total nitrogen dissolved by 22% (w/v) hydrochloric acid in 16 hours at 100' was 83-88%, and this did not increase appreciably in 48 hours.3. a-Amino-nitrogen in this solution reacbed a maximum in 16 hours and then decreased ; ammonia-nitrogen continued to i se up to 48 hours. The increase in ammonia was attributed to deamination.4. The a-amino-nitrogen and amide-nitrogen contents of composts from wheat straw and sewage sludge, and wheat straw and ammonium sulphate, and the solubility of the nitrogen in 2 % and 22% (w/v) hydrochloric acid were determined at different stages of decomposition.5. The changes in the percentage of total nitrogen present as a-amino-nitrogen and amide-nitrogen were greatest during the first few weeks of composting.6. The percentage composition of the insoluble organic nitrogen present, defined as the nitrogen not soluble in cold o-IN-hydrochloric acid, appeared to be almost independent after 3 months' decomposition of the initial source of nitrogen used in composting.

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Untersuchungen über Lagerung und Wirkung von Stalldünger. Teil V: Feststellung der Stoffumsetzungen im Kaltmist mit Hilfe der „Profilmethode”︁ bei viertägiger bis sechsmonatiger Rottungszeit

Cited by 4 publications

References 9 publications

Die Humusstoffe im Stallmist, ihre Bestimmung, Bedeutung und Entwicklung während der Rotte .. [Untersuchungen über Lagerung und Wirkung von Stalldünger. Teil VI.]

Die Humusstoffe im Stallmist, ihre Bestimmung, Bedeutung und Entwicklung während der Rotte .. [Untersuchungen über Lagerung und Wirkung von Stalldünger. Teil VI.]

Modellversuche über Stoffabbau und Temperatur bei der Stallmistlagerung

Studies on composts prepared from waste materials. II.—the fractionation of orǵaanic nitroǵaen

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