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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.


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Journal ArticleDOI
TL;DR: In this article, a polarized infra-red absorption of monocrystalline KNO 3 samples has been studied in the region of nitrate ion internal vibrations at temperatures 90 −575°K.

24 citations

Journal ArticleDOI
TL;DR: In this article, Tomato plants (Lycopersicon esculentum cv. Amberley Cross) were grown in sand culture and were fed with four concentrations of potassium nitrate in combination with two levels of sodium nitrate.
Abstract: Tomato plants (Lycopersicon esculentum cv. Amberley Cross) were grown in sand culture and were fed with four concentrations of potassium nitrate in combination with two levels of sodium nitrate. After six weeks the plants were scored for the presence and absence of a symptom of potassium deficiency, namely, marginal chlorosis and/or necrosis in the young, fully-expanded leaves. These leaves were also analysed for K and Na. Marginal chlorosis and/or necrosis occurred in plants given a nutrient solution containing 0.5 meq K/I or less and supplied with either of the sodium nitrate levels. However, the symptoms occurred more frequently in plants receiving the lower level of sodium nitrate. The laminae on plants receiving the lower concentration of sodium nitrate had a 50 per cent incidence of chlorisis and/or necrosis when the tissue potassium content was 0.74 per cent of the dry wt, while those laminae on plants receiving the higher level did not show a 50 per cent incidence until their potassium fell to 0.64 per cent of the dry wt.

24 citations

Journal ArticleDOI
TL;DR: The most significant reduction in growth parameters of plant height, shoot fresh weight, fruit yield and nutrients uptake was in plants treated with KCl + CaCl2 particularly at EC8, while the highest leaf macronutrient concentrations were in KNO3 + CaNO3 at EC5 and/or EC8 that showed only higher leaf N and Ca values compared to the control.
Abstract: This study was conducted to evaluate effects of higher conductivity of nutrient solution created by nitrate or chloride salts of potassium and calcium on growth characteristics of pepper plants (Capsicum annuum var annuum) during four months of growth period. Two EC5 and EC8 dS/m of Hoagland nutrient solution were prepared using various salt combinations, namely; KCl + CaCl2, KNO3 + CaNO3, and KNO3 + CaNO3 + NaCl. Hoagland nutrient solution with EC 1.8 dS/m was served as control. Higher conductivity treatments had different effects on pepper plant growth. The most significant reduction in growth parameters of plant height, shoot fresh weight, fruit yield and nutrients uptake were in plants treated with KCl + CaCl2 particularly at EC8. Application of KNO3 + CaNO3 particularly at EC5 showed no difference with control regarding many growth parameters. Application of KNO3 + CaNO3 at EC5 resulted in higher shoot fresh weight compared to control. All salinity treatments except KNO3 + CaNO3 at EC5 reduced fruit yield compared to control. Treatments of KCl + CaCl2 and KNO3 + CaNO3 + NaCl particularly at EC8 of nutrient solution resulted in higher leaf proline concentration, catalase and peroxidase enzymes activity compared to control. Other conductivity treatments showed no difference in catalase or peroxidase enzymes activity. The significant lowest amount of leaf N, K, Mg and Ca was in KCl + CaCl2 at EC8. On the other hand, the highest leaf macronutrient concentrations were in KNO3 + CaNO3 at EC5 and/or EC8 that showed only higher leaf N and Ca values compared to control. Leaf micronutrient concentrations were highest in KNO3 + CaNO3 at EC5 that generally showed no difference with control plants. However, application of KCl + CaCl2 particularly at EC8 and to less extent KNO3 + CaNO3 + NaCl at EC8 reduced leaf micronutrient concentrations. Application of KNO3 + CaNO3 at EC5 increased and KCl + CaCl2 or KNO3 + CaNO3 + NaCl at EC8 decreased the leaf Fe concentration compared to control plants.

24 citations

Journal ArticleDOI
TL;DR: In this article, single-crystal rods of the α-phase of potassium nitrate were grown with uniform crystallographic orientation inside a matrix of aluminum oxide nanopores, and dielectric polarization measurements of the porous film filled with the single crystals were obtained from a supersaturated aqueous solution at various temperatures.
Abstract: Single-crystal rods of the α-phase of potassium nitrate were grown with [010] uniform crystallographic orientation inside a matrix of aluminum oxide nanopores. The pores were prepared by anodization of polished aluminum substrates. The potassium nitrate single crystals were grown inside the pores from a supersaturated aqueous solution at various temperatures. Dielectric polarization measurements of the porous film filled with the potassium nitrate crystals show an electric field induced reversible transition from the nonferroelectric α-phase to the ferroelectric γ-phase at about 200kV∕cm. The ferroelectric γ-phase has a coercive field of about 169kV∕cm and remnant polarization of about 0.216μC∕cm2.

24 citations

Journal Article
TL;DR: In this paper, a hundred samples of total diets, 19 samples of cheese (mainly Dutch), a total of 30 samples of muscle, fat liver, kidney, blood and fried meat from experimental veal calves (fed daily with 0.6 or 300 mg of potassium nitrate per kg b.w.) have been analysed with GC-TEA for their content of the following N-nitrosamines: NDMA, NDEA, NDPA, NDBA, NPIP, NPYR and NMOR.
Abstract: A hundred samples of total diets, 19 samples of cheese (mainly Dutch), a total of 30 samples of muscle, fat liver, kidney, blood and fried meat from experimental veal calves (fed daily with 0.6 or 300 mg of potassium nitrate per kg b.w.) and 14 samples of urine of patients medicated with massive amounts of ammonium nitrate (up to an equivalent of 180 mg potassium nitrate per kg b.w.) have been analysed with GC-TEA for their content of the following N-nitrosamines: NDMA, NDEA, NDPA, NDBA, NPIP, NPYR and NMOR. NDMA was frequently found, but always in the sub micrograms per kg range, except for two diets (1.2 and 1.7 microgram/kg). Other N-nitrosamines were sporadically found in the same concentration range, except for one diet (NPYR, 1.9 microgram/kg). No correlation was found between NDMA content and the composition of diets or the nitrate load of patients or veal calves. Mean daily intake of NDMA, potassium nitrate and sodium nitrite from total diets was calculated to be 0.5 microgram, 215 mg and 7.7 mg respectively. N-nitrosamine recoveries from the various samples were determined mostly at the 1 microgram/kg level. Contents of potassium nitrate and sodium nitrite are reported for 124 samples of various vegetables, 94 samples of canned baby food and 48 samples of human saliva, collected at various times after the intake of meals. Some kinds of vegetables showed high to very high nitrate contents, for example, purslane, red beets, spinach and lettuce. Only traces of nitrite were found in the vegetables. Salivary nitrite content was shown to be highly dependent on the dietary intake of nitrate and increased up to 60 times its initial value after the consumption of vegetable-rich meals.

24 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202268
202139
202064
2019167
2018241