|Powell, J Mark|
Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 1/21/2003
Publication Date: 1/21/2003
Citation: CUSICK, P., POWELL, J.M., HENSLER, R., KELLING, K. NITROGEN AVAILABILITY FROM VARIOUS DAIRY MANURE COMPONENTS. MEETING ABSTRACT. 2003. Interpretive Summary:
Technical Abstract: Manure nitrogen (N) mineralization in soil and availability to crops is strongly affected by soil texture, temperature and moisture. The objective of this study was to evaluate the effects of soil texture and temperature on component manure N mineralization. 15N labeled or unlabeled dairy feces, urine and wheat straw bedding were differentially added to six soils to achieve an equivalent application rate of 320 kg total N ha-1 (36% derived from feces, 42% from urine and 22% from bedding). Each incubation vessel contained one of the three manure components labeled and the other two unlabeled components. The soils covered a wide range of soil textures and represented the prominent soil types on Wisconsin dairy farms. Soils were kept at field moisture capacity and incubated at 11, 18 or 25º C for 24-weeks. Incubation vessels (three per treatment) were sampled at weeks 0, 2, 3, 6, 12 and 24 and samples were extracted with 2M KCl for mineral N (ammonical- plus nitrate-N). Mineralization of fecal N and straw N were similar (15 to 16% of applied N), greatest at 25º C, and higher in light than in heavy textured soils. Soil type and temperature did not significantly affect urine N mineralization. Average mineralized N in all soils amended with urine over all temperatures was 55% of total urine N applied. Soil type did not effect N mineralization when all three labeled manure N components were applied. In incubation vessels that contained all three labeled manure N components, N mineralization was similar and highest at 18 and 25º C. Interactions between soil type and temperature on mineral N measurements indicate further investigation, especially impact of manure components on soil microbial communities.