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.

Role of Potassium Nitrate (KNO 3 ) in Alleviation of Detrimental Effects of Salt Stress on Some Physiological and Cytogenetical Parameters in Allium cepa L.

Abstract: In this work, the effects of potassium nitrate (KNO3) on the seed germination, seedling growth (radicle length, radicle number and fresh weight), mitotic activity and chromosomal aberrations of Allium cepa L. germinated under both normal conditions and salt stress were studied. The final germination percentages, radicle lengths, radical numbers and fresh weights of onion seeds germinated in the medium with KNO3 alone were statistically the same as ones of the control seeds germinated in distilled water medium. In addition, the mitotic index in root tip meristems of A. cepa seeds germinated in the medium with KNO3 alone demonstrated a decrease according to ones of the control seeds germinated in distilled water medium, while their frequency of chromosomal aberrations showed an increase according to the control. On the other hand, salt stress considerably inhibited the seed germination and seedling growth of A. cepa. Furthermore, it markedly decreased the mitotic index in root tip meristems of the seeds and increased the number of chromosomal aberrations. The detrimental effects of salt on the seed germination, seedling growth, mitotic activity and chromosomal aberrations was dramatically alleviated in varying degrees by KNO3 application.

Dedicated fertilizer for ornamental pineapple

Abstract: The invention discloses a specific fertilizer of ornamental pineapple in the floral fertilizer technological domain, which comprises the following parts: 0-30% calcium ammonium nitrate, 0-60% potassium nitrate, 0-30% monobasic potassium phosphate, 0-8.2% monoammonium phosphate, 2-47% potassium sulfate, 4.3-23% magnesium sulfate, 0-17% aquacare, 0.422-0.823% EDTA-Fe, 0.048-0.096% zinc sulfate, 0.007-0.013%copper sulfate, 0.013- 0.024%sodium molybdate and 0.055-0.110% manganese sulfate.

Differential scanning calorimetry analysis of crystal structure transformation in spray-dried particles consisting of ammonium nitrate, potassium nitrate, and a polymer

Abstract: Ammonium nitrate (AN) is an affordable oxidant; however, it undergoes crystal structure transformations accompanied by a change in volume at comparatively low temperatures (approx. 30, 80, and 125 °C) and exhibits high hygroscopicity. Both these properties are particularly problematic for the industrial application of AN. In a previous study, we prepared spray-dried particles comprising three components: AN, potassium nitrate (PN) as a phase stabilizer, and a polymer (e.g., polyvinyl alcohol, carboxymethylcellulose salt, and styrene-butadiene latex), which was confirmed to provide effective moisture proofing. In the present study, the crystal transformation behavior of AN/PN/Polymer particles is investigated by observing their thermal behavior by differential scanning calorimetry. The results reveal that phase-stabilized AN can be successfully prepared by the addition of PN. In addition, an intriguing possibility was identified in that carboxymethylcellulose ammonium salt and polyvinyl alcohol, which were both added as polymer components for moisture proofing, also acted as phase stabilizers for AN crystal transformation.

The Spectrophotometry of Nitrate Solutions in Aqueous Sulphuric Acid

Abstract: The ultraviolet spectra of solutions of potassium nitrate in aqueous sulphuric acid have been studied. Three absorptions, those due to the species NO3-, HNO3, and NO2+, have been found. From this study a semiquantitative picture has been developed of the distribution of the total nitrate between these three species. It was found that in the sulphuric acid concentration range 0-15% by weight, the dissolved nitrate existed as nitrate ion and that from 15-70% sulphuric acid, nitrate ion, and molecular nitric acid were present in comparable amounts. In the sulphuric acid concentration range 72-82% nitric acid accounted for the total dissolved nitrate and as the sulphuric acid concentration was increased from 82-90% nitric acid was converted to nitronium ion.

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.