Microbiologist, Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Riverside, Calif. Abstract: Presently available data indicate that biological dinitrogen fixation is responsible for the greatest proportion of nitrogen entering chaparral ecosystems. Dinitrogen fixation by the Rhizobium-legume symbioses is relatively unimportant in chaparral w...

was leaf gas exchange. The basis of the N2 fixation tolerance to water deficit in the eight selected PI lines is Nitrogen fixation in soybean (Glycine max Merr.) is especially not known. sensitive to soil drying. The basis of this sensitivity appears to be related to the fact that ureides are transported from the nodules, Recent studies have focused on ureide accumulation and the ureide concent...

To compare the functional gene structure and diversity of microbial communities in saline-alkali and slightly acidic oil-contaminated sites, 40 soil samples were collected from two typical oil exploration sites in North and South China and analyzed with a comprehensive functional gene array (GeoChip 3.0). The overall microbial pattern was significantly different between the two sites, and a mor...

CONTENTS 36.1 Bio-Char Management and Soil Nutrient Availability ............................................. 518 36.2 Microbial Cycling of Nutrients in Soils with Bio-Char ............................................ 519 36.3 Biological Nitrogen Fixation in Soils with Bio-Char................................................. 521 36.4 Slash-and-Char as an Alternative to Slash-and-Burn ...........

Simple nitrogen (N) input/output balance calculations in agricultural systems are used to evaluate performance of nutrient management; however, they generally rely on extensive assumptions that do not consider leaching, denitrification, or annual depletion of soil N. We constructed a relatively complete N mass balance for the Big Ditch watershed, an extensively tile-drained agricultural watersh...

Rising atmospheric carbon dioxide (Ca), a product of fossil fuel burning, land-use change, and cement manufacture, is expected to cause a large carbon sink in land ecosystems, partly mitigating human-driven climate change (1). Increasing biological nitrogen fixation with rising Ca has been invoked as a means to provide the N necessary to support C accumulation (2). As in many short-term experim...

Although the use of vinasse as a waste helps replenish soil nutrients and improves the quality of the sugarcane crop, it is known that vinasse residues alter the diversity of bacteria naturally present in the soil. The actual impacts of vinasse application on the selection of bacterial taxa are not understood because no studies have addressed this phenomenon directly. Analysis of 16S rRNA gene ...

Phosphate (P) fixation to the soil solid phase is considered to be important for P availability and is often attributed to the strong binding of orthophosphate anion species. However, the fixation and subsequent immobilization of inositolhexa and pentaphosphate isomers (phytate) in soil is often much stronger than that of the orthosphate anion species. The result is that phytate is a main organ...

Rhizobium microbial bacteria functioning that living a symbiosis relationship soil and leguminous plant root fixation of nitrogen to be utilized by superior performance during grain development stage. They can enter into with plant, infecting their nodules. The legume crops are the bigger partner, often referred as macro-symbiotic. Usually certain strains form nodule on limited plants. Such col...