• Korean Journal of Soil Science and Fertilizer
• /
• v.31 no.3
• /
• pp.233-237
• /
• 1998

Mineralization of organic N is an important factor in determining the appropriate rate for organic waste application to cropland. The mineralization of organic N was examined using sandy soil amended with three kind of compost (municipal solid waste+biosolid, yard trimmings, yard trimmings+biosolid), respectively. During the 12-week incubation, the mineralization of organic N was determined by analyzing the inorganic N in leachates from unamended and amended soils. Soils amended with com posts made of biosolid had higher initial $NH_4-N$ concentration than unamended soil. Soil amended with compost made of yard trimmings only had slightly lower initial inorganic N concentration than unamended soil. In the soil amended with com post made of yard trimmings+biosolid, however, nitrification rate was enhanced in the first week of incubation. Net N mineralization and nitrification were positive in all treatments. Although the greatest net N mineralization occurred in the soil amended with compost made of yard trimmings+biosolid, the greatest net mineralization and nitrification rates occurred in unamended soil.

• The Plant Pathology Journal
• /
• v.16 no.5
• /
• pp.283-285
• /
• 2000

Two field tests were conducted in 1995 to examine the effects of composts and soil amendments on physicochemical properties of soil in relation to Phytophthora root and crown rot of bell pepper. Chitosan, crab shell waste, humate, sewage sludge-yard trimmings, and wood chips were applied to test plots, some of which affected the levels of P, K, Mg, pH, and H. Physicochemical properties were not related with disease incidence, but percent organic matter, estimated nitrogen release, K, and Mg were correlated with total microbial activity. The elements K and Mg were especially responsible for the increased soil microbial activity that could affect development of root and crown rot of pepper.

• Resources Recycling
• /
• v.20 no.5
• /
• pp.3-15
• /
• 2011

This study describes the national municipal solid waste stream of the United States based on data collected and published by EPA for 1960 through 2009. This paper characterizes the municipal solid waste stream of the nation as a whole, and can be useful for understanding the nationwide stream of America. Among the various materials contained in MSW, recycling status of the major materials of paper and paperboard, glass, metals, plastics, food scraps and yard trimmings are discussed somewhat more minutely.