نتایج جستجو برای: such mineral elements as nitrogen
تعداد نتایج: 6175124 فیلتر نتایج به سال:
oxidative addition reactions of 1,4-diiodo-butane and 1,3-diiodo-propane with [ptme2(ph2phen)]; in which ph2phen=4,7-diphenyl-1,10-phenanthroline, were studied in different solvents such as acetone and benzene.oxidative addition reaction of [pt me2(ph2phen)] with i(ch2)4i and i(ch2)3i produced the [pt me2i(ch2)4(ph2phen)i] (1a) and [pt me2i(ch2)3(ph2phen)i] (1b).all the platinum (iv) products w...
in order to evaluation the effects of different soil fertility systems on chickpea seed quality, field experiments were carried out in sanandaj agriculture research station of iran in 2007 and 2008 growing seasons. experimental units were arranged in split-split plots based on randomized complete blocks with three replications. green manure levels considered main plots, base fertilizer compound...
There is a possibility of using agricultural waste, in particular weeds, innovative technologies for the restoration disturbed land order to increase fertility. Digestate, after anaerobic digestion manure and weed plant Amaranthus retroflexus L. (AR), as well solid carbonaceous residue pyrolysis AR. The combination digestate, which contains high concentrations total nitrogen, phosphorus, potass...
from its emergence till present time marxist principles has undergone great changes since their promulgation by marx. many theorists and thinkers set at rectifying marxist tenets and introducing those of their own while others advocated its main concepts and attempted at improving them. among marxist philosophers who had an intensive study of marxs ideology, is louis althusser whose reflections...
To investigate the effect of plant residues in increment of soil organic matter and nitrogen, a randomized complete block design (RBCD) with 4 replications using 10 different plant species was carried out in 2009. The studied plants belonged to three families including Gramineae (Sorghum bicolor, Panicum miliaceum and Avena sativa), Brasicaceae (Eruca sativa) and Leguminoseae (Trifolium pratens...
Nitrogen fertilizers is an essential input into modern agriculture, however the use of large amounts of this mineral fertilizers caused in the last three decades enormous environmental impacts such as eutrophication of waters and soils, loss of biodiversity, drinking water pollution and human health risks. The agri-environmental policy plays a crucial role to internalize pollution externalities...
Most of the cultural trials and experiments with cinchona prior to 1900 were recorded as observations. AWith the possible exception of the work by COWGILL (1) the published information with reference to the effects of fertilizer applications onl growth and alkaloid content of cinchona deal mainly with established trees (3, 4, 8, 9, 11). Although it is generally conceded that the first few month...
Within the last 3 decades, fossil fuels have been the largest source of greenhouse gas emissions. Energy intensive industries are the main energy-consuming sectors in Iran. Non-metallic mineral products, basic metals, and chemical products are considered to be the most energy intensive industries in Iran. this paper means to evaluate the environmental efficiency of industrial sector during 2008...
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