Potassium nitrate

About: Potassium nitrate is a research topic. Over the lifetime, 3537 publications have been published within this topic receiving 29450 citations. The topic is also known as: Nitric acid, potassium salt & Saltpeter.

Non-destructive monitoring of nitrate concentration in a laboratory flow experiment using time domain reflectometry (TDR).

Abstract: Nitrates, when found in excess in the groundwater, are a health hazard. Nitrates can easily be transported by groundwater movement and may eventually reach aquifers located far away from the contamination location. Recent research has focused on developing innovative techniques to remediate nitrate‐contaminated soils. It is important to monitor the nitrate movement in the groundwater to predict the extent of nitrate contamination. Traditionally, nitrate movement is monitored by sampling soil pore water and analysing it in the laboratory. In this study a non‐destructive method, using time domain reflectometry (TDR) to monitor nitrate movement in laboratory flow experiments, is presented. Three flow cells (replicates) packed with a silty loam soil were subjected to a constant hydraulic gradient inducing saturated water flow through the flow cells. A source of potassium nitrate solution, containing 500 ppm NO3‐N, was connected at the inflow end, and the nitrate concentration change with time was monitored al...

Changes in the antioxidant and glyoxalase enzyme activities in leaves of two Moroccan sorghum ecotypes with differential tolerance to nitrogen stress

Abstract: Nitrogen stress as well as other stresses can negatively impact the plant development and metabolism. Generally, stress factors increase the reactive oxygen species (ROS) and methylglyoxal (MG) production, which may, in the absence of effective protective mechanisms, induce irreparable metabolic dysfunction and death. The effect of different amounts (from deficiency to excess) of nitrate, ammonium or nitrate combined to ammonium, on enzyme activities of antioxidant and methylglyoxal detoxification systems of two sorghum ecotypes (3P4 and 4P11) was studied. The N supply was performed per pot during the sowing step using potassium nitrate and/or ammonium sulfate. Six N treatments were applied using 120, 240 and 480 Kg ha-1 of ammonium or nitrate and three other treatments were applied using 120 kg ha-1 nitrate combined to 120, 240 and 480 kg ha-1of ammonium. The specific activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), glutathione reductase (GR), glyoxalase I (Gly I) and glyoxalase II (Gly II) were investigated. Results showed that, ammonium excess and N-deficient conditions increased the contents of malondialdehyde (MDA), and induced the enzyme activities of ROS and MG detoxification systems, supporting the sorghum’s ability to counteract the negative effect of N stress (deficit and excess). We have also shown that the SOD, CAT, GR and Gly I enzyme activities were higher in the 4P11 ecotype compared to the 3P4 ecotype. These results indicate that sorghum ecotypes exhibit differential tolerance to N stress and suggest that the 4P11 ecotype has higher capacity to cope with N stress.

Regulation of the Expression of Nitrate Reductase genes in Leaves of Medical plant, Foeniculum vulgare by Different Nitrate Sources

Abstract: The effect of different sources of nitrate salts (ammonium nitrate, sodium nitrate and potassium nitrate) on nitrate reductase (NR) activity and nitrate reductase expression in the leaves of Foeniculum vulgare seedlings grown in pots containing perlite. Two week old seedlings were treated with 30, 60 and 120 mM aqueous solution of ammonium nitrate, sodium nitrate or potassium nitrate. After 21 days of nitrate supply, the leaves were harvest and kept in liquid nitrogen for analysis of nitrate/nitrite ratio, nitrate reductase activity and mRNA expression. Result showed that ammonium nitrate, sodium nitrate and potassium nitrate, as inducers, had significant effects on both nitrate reductase activity and nitrate reductase expression in some rates. In high ammonium nitrate, sodium nitrate and potassium nitrate supplies, nitrate reductase activity and nitrate reductase expressions were suppressed apparently due to nitrogen metabolite response inhibition and toxicity.

Combined chemical for fireworks and its prepn process

Abstract: The present invention is one kind of combined chemical for fireworks and its preparation process, and aims at providing one kind of combined chemical for fireworks possessing high heat stability, high mechanical sensitivity and high safety for compounding, producing, storing and transporting. It is ignited only in burning its fuse. The combined chemical consists of oxidant of barium nitrate and/or potassium nitrate; and inflammable including one or several of sulfur, aluminum powder, Al-Mg alloy powder, charcoal powder, titanium powder, coal powder, alumina slag, iron slag, carbon slag, resin and starch dextrin in the ratio of 100 to 10-120. It may also contain coloring agent of barium nitrate, strontium nitrate, copper carbonate and/or sodium oxalate; and effect chemical comprising sounder and color bead.