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Ammonia volatilization from cattle and pig slurry duringstorage and after application in the field

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The Danish Institute of Plant and Soil Science Research Centre for Agriculture

Department of Plant Nutrition and Physiology Research Centre Foulum

DK-8830 Tjele

Beretning nr. S 2209

Ammonia volatilization from cattle and pig slurry during storage and after application in the field

Ammoniakfordampning fra kvæg- og svinegylle under opbevaring og efter udbringning i marken

SVEND GJEDDE SOMMER

Summary

The dissertation is a Ph.D. thesis submitted to the Royal Veterinary and Agricultural University, Section of Soil, Water and Plant Nutrition. Tech- niques for measuring ammonia losses from slurry are discussed and evaluated. Ammonia losses from cattle and pig slurry during storage and after application in the field are quantified and techniques for reducing volatilization losses are

proposed. It is shown that ammonia losses from slurry applied in the field are related dry matter content, temperature and wind speed. A simple model for predicting ammonia loss from stored slurry was developed. Input variables for the model are TAN concentrations, surface pH, air temperature, wind speed and surface characteris- tic. There was agreement between model predic- tion and measured ammonia losses.

Key words: Ammonia volatilization, cattle, pig, slurry, storage, field.

Resumé

Beretningen er en afhandling udarbejdet med henblik på at erhverve en Ph.D. grad fra Den Kgl. Veterinær- og Landbohøjskole, Institut for Jordbrugsvidenskab. I beretningen vurderes, hvilke metoder der er velegnede til bestemmelse af ammoniaktab fra udbragt gødning. Ammo- niaktabet fra kvæg- og svinegylle under lagring,

udbringning og efter udbringning kvantificeres, og der anvises mulige tiltag til begrænsning af ta- bet. Det beskrives, hvorledes faktorerne tørstof- indhold temperatur og vindhastighed påvirker tabet fra udbragt gylle og de fysisk-kemiske rela- tioner af betydning for ammoniaktabet fra lagret gylle beskrives, og en model til beregning af tabet fra lagre præsenteres.

Nøgleord: Ammoniakfordampning, kvæg, svin, gylle, lagre, marken.

108 Tidsskr. Planteavl 96 (1992), 108.

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