The primary mode of nitrogen (N) loss from tile-drained row-cropped land is generally nitrate-nitrogen (NO3-N) leaching. Although cropping, tillage, and N management practices can be altered to reduce the amount of leaching, there are limits as to how much can be done. Data are given to illustrate the potential reductions for individual practices such as rate, method, and timing of N applicatio...

years. Fertilizing once in the spring with a complete fertilizer with Uramite as the nitrogen source was satisfactory. On Lakeland soil Valencia and Hamlin orange tree growth was very good when about 1, 2, and 4 pounds of 8-2-8 inorganic fertilizer was applied in the first, second, and third seasons, respectively. Timing of applications of fertilizer also was not critical for young Valencia or ...

An increased excretion of nitrogen after injuries in experimental animals and in man was described by Cuthbertson (1930). In a series of papers he and his colleagues discussed and explored almost all the facets of this phenomenon which have since been studied (see, e.g., Cuthbertson, 1929, 1930, 1936, 1942; Cuthbertson & Tompsett, 1935 ; Cuthbertson, McGirr & Robertson, 1939). He investigated t...

This project is focused on the use of commercially available precision agriculture technology and tested for its capacity to perform variable-rate application of Nitrogen fertilizer in irrigated durum wheat in Maricopa, AZ. The technology tested in this study includes active-light canopy reflectance and displacement sensors, as well as GPS-based rate controllers for application equipment. Multi...

one pollutant which seriously threatens water resources is dye. therefore, finding a suitable method to separate the dye in water resources is very important. an adsorption process that uses low cost adsorbents is considered as an efficient strategy for this purpose. in this study, erythrosine dye removal from an aquatic environment using natural absorbents, namely sorghum and ziziphus nummular...

If the environmental damages that are caused by excessive nitrogen load to the sea depend on the timing of emissions, then monitoring the stochastic variation of emissions is crucial for controlling eutrophication damages. A significant problem of nonpoint source (NPS) nitrogen pollution is that emissions are stochastic and difficult to control. The main purpose of this paper is to examine unde...

The indirect responses of soil microbiota to changes in plant physiology effected by elevated atmospheric carbon dioxide have the potential to alter nutrient availability and soil carbon storage. We measured fine root density, microbial biomass nitrogen, rates of nitrogen mineralization and nitrification, substrate utilization by soil bacteria and extracellular enzyme activities (EEA) associate...

In Schizosaccharomyces pombe, the nuclear accumulation of Cdc25 peaks in G2 and is necessary for the proper timing of mitotic entry. Here, we identify the sal3(+) gene product as an importin-beta homolog that participates in the nuclear import of Cdc25. Loss of sal3(+) results in a cell cycle delay, failure to undergo G1 arrest under nitrogen-starvation conditions, and mislocalization of Cdc25 ...