After the change of communist regime and takeover agricultural areas by private permits, they, in context presence on market a limited range chemical fertilizers at low prices, began their irrational application, order to obtain large yields. Although most farmers currently apply fertilizer resources scientific basis, effect previous practices is still felt, affecting groundwater quality. This ...

abstract in this study different proportions of nh4+ and no3- in the growth medium on plant growth were investigated in hydroponic greenhouse experiments. the objectives of these studies were to investigate if ammonium (nh4+) stress in cucumber, a species sensitive to nh4+ toxicity, can be alleviated by matching the nitrogen supply rate to the plant nitrogen demand. ammonium was applied at a re...

In comparison with the original determination based on Weissenberg film data [Khan et al. (1970 ▶). Acta Cryst. B26, 1889-1892], the current redetermination of diammonium hydrogenarsenate(V) reveals all atoms with anisotropic displacement parameters and all H atoms localized. This allowed an unambiguous assignment of the hydrogen-bonding pattern, which is similar to that of the isotypic phospha...

Futile plasma membrane cycling of ammonium (NH4+) is characteristic of low-affinity NH4+ transport, and has been proposed to be a critical factor in NH4+ toxicity. Using unidirectional flux analysis with the positron-emitting tracer 13N in intact seedlings of barley (Hordeum vulgare L.), it is shown that rapid, futile NH4+ cycling is alleviated by elevated K+ supply, and that low-affinity NH4+ ...

Abstract This work aimed at evaluating the impact of human activity and geology on surface water quality Ouled Mellouk dam (northwestern Algeria). Specifically, methodology aims to assess seasonal variations several parameters (EC, TDS, pH, SO42−, Cl−, Ca2+, Na+, HCO3−, NO3−, PO43− Mg2+, organic matter, suspended solids, BOD5, COD) from 2007 2013 define processes controlling mineralization poll...

Ambient air pollution from PM2.5 is a major risk to human and environmental health, with significant impacts on mortality morbidity. Mitigation policies—which may be regional or national in extent—need consider both primary secondary particles effective, balancing within-region emissions longer-range transport phenomena. The modelling system WRF-CMAQ was used simulate the impact of reductions W...

journal.publications.chestnet.org Financial/nonfi nancial disclosures: The author has reported to CHEST that no potential confl icts of interest exist with any companies/organizations whose products or services may be discussed in this article. Correspondence to: Rahul Magazine, MD , Department of Pulmonary Medicine, Kasturba Medical College, Manipal University, Manipal, Karnataka-576104, India...

journal.publications.chestnet.org Financial/nonfi nancial disclosures: The author has reported to CHEST that no potential confl icts of interest exist with any companies/organizations whose products or services may be discussed in this article. Correspondence to: Rahul Magazine, MD , Department of Pulmonary Medicine, Kasturba Medical College, Manipal University, Manipal, Karnataka-576104, India...

Plants can use ammonium (NH4+) as the sole nitrogen source, but at high NH4+ concentrations in the root medium, particularly in combination with a low availability of K+, plants suffer from NH4+ toxicity. To understand the role of K+ transporters and non-selective cation channels in K+/NH4+ interactions better, growth, NH4+ and K+ accumulation and the specific fluxes of NH4+, K+, and H+ were ex...

Solution culture experiments were carried out to study the kinetics at cotyledon stage (11-day-old) and the effect of different NO3/NH4 on NO3 and NH4 uptake at seedling stage (31-day-old) with two cultivars of sugar beet, including Tianyan7 and Tianyan8. NO3 uptake by sugar beet seedlings at cotyledon stage (11-day-old) reached equilibration after 2 hours of adaptation, and NH4 uptake reached ...