Anaerobic lagoons for storage/treatment of livestock manure (2000)

Many livestock producers with confinement operations handle their animal waste as a liquid because of the laborsaving advantages. Anaerobic lagoons are an integral part of many liquid-handling systems. Lagoons are pondlike earthen basins sized to provide biological treatment and long-term storage of animal waste. A livestock lagoon is a small-scale waste treatment plant containing manure that is usually diluted with building wash water, water wasted at animal waterers, and rainfall. In a lagoon, the manure becomes partially liquefied and stabilized by bacterial action before eventual land application. Lagoons may contain one of three types of waste-stabilizing bacteria -- anaerobic (inhibited by oxygen), aerobic (requiring oxygen) or facultative (maintained with or without oxygen). Lagoons are larger than manure storage basins, which do not provide significant biological treatment and, frequently, are designed for shorter storage periods. On the other hand, anaerobic lagoons are considerably smaller than aerobic lagoons, which are designed to provide a higher degree of treatment with less odor production. Anaerobic lagoons also decompose more organic matter per unit volume than aerobic ones. Due to the tremendous area required for aerobic lagoons to treat livestock waste, almost all livestock lagoons are anaerobicNew 10/00/7

Earthen pits (basins) for liquid livestock manure (2000)

Storage structures for slurry (liquid) livestock manure range from low-cost earthen basins and moderate-cost concrete pits and tanks to higher-cost, glasslined steel tanks. This publication deals with earthen pits, with and without concrete liners.New 10/00/7

Effects of Temperature on Seta Elongation in Atrichum Undulatum

Author Institution: Department of Botany, The Ohio State University, Columbus, Ohio 43210Field-collected gametophytes of Atrichum undulatum were placed in two growth chambers which were maintained at the same light intensity and light period, but at two different temperature regimes. After sporophyte development, differences in seta lengths were observed. Measurements of cell lengths revealed that attached setae grown in the high-temperature regime (12°-22°C) were longer than those grown in a low-temperature regime (3°-12°C), as a result of both more cell divisions and a larger average cell length. Thus, temperature appeared to influence both cell division and cell elongation in the setae of Atrichum undulatum

Operating and maintaining underground outlet terrace systems (1993)

The proper operation of underground outlet terrace systems depends on good farming practices, frequent inspections and prompt correction of problems. Inspect your systems soon after each significant rainfall. This is the best time to see existing or potential problems. Plainly marked inlets and outlets make this chore easy. Timely repairs or replacements normally lower maintenance costs, increase the life of the system and prevent serious problems

Bryophyte Taxa Lists of the High Alaskan Arctic

Bryophytes reported previously in the literature are listed for northern Alaska. The geographical area includes the Arctic Coastal Plain and the northern foothills and slopes of the Brooks Range, approximating the area designated the Alaskan Arctic Slope. Annotations concerning reported nomenclatural changes are given for selected taxa. Separate taxa lists are included for five localities designated as Anaktuvuk Pass, Lake Peters, Meade River, Point Barrow, and Umiat. A total of 232 taxa are included

A model describing photosynthesis in terms of gas diffusion and enzyme kinetics

A model predicting net photosynthesis of individual plant leaves for a variety of environmental conditions has been developed. It is based on an electrical analogue describing gas diffusion from the free atmosphere to the sites of CO 2 fixation and a Michaelis-Menten equation describing CO 2 fixation. The model is presented in two versions, a simplified form without respiration and a more complex form including respiration. Both versions include terms for light and temperature dependence of CO 2 fixation and light control of stomatal resistance. The second version also includes terms for temperature, light, and oxygen dependence of respiration and O 2 dependence of CO 2 fixation.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47495/1/425_2004_Article_BF00387066.pd