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

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

Beef Manure Management Systems in Missouri (2000)

Missouri beef manure management, usually for feedlots rather than for pasture systems, can be classified into four systems: solid, semisolid, slurry and lagoon (liquid), depending on the solids content, which determines the equipment used for collection, transportation and distribution of the manure onto the fields.New 10/00/7

Floristic and Ecologic Studies of Bryophytes of Selected Habitats at Prudhoe Bay, Alaska

Preliminary floristic and ecologic studies of bryophytes were initiated in the vicinity of Prudhoe Bay, Alaska. Comparisons among different habitats indicated bryofloristic differences with respect to an apparent moisture gradient. A provisional check list consisting of 81 taxa is provided