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.

Yielding of red pepper (Capsicum annuum L.) under the influence of varied potassium fertilization.

Abstract: The type of the applied nitrogen fertiliser plays a significant role in plant nutri- tion. Supplying plants with potassium in the form of chloride, sulphate or salpetre signifi- cantly modifies the chemical composition of plants, as anions accompanying potassium serve different functions. The vegetation experiment on the cultivation of red pepper cv. 'Cyklon' was conducted in 2005 and 2006 in a plastic tunnel in rings (V = 5 dm 3 ) filled with mineral soil and highmoor peat (3:2). The response of plants to three potassium salts KCl, K2SO4 and KNO3 was determined at two levels of nitrogen-potassium fertilization of 250 mg N and NH4NO3 and 300 mg K, as well as 350 mg N and 400 mg K·dm -3 substrate, at constant levels of the other macro- and microelements. Biometric measurements of plants were taken and the volume of fruit yield was determined. It was found that the type of potassium fertilizer at the two levels of nitrogen and potassium fertilization did not have a significant effect on total and marketable yields of fruits in red pepper cv. 'Cyk- lon', plant height, total and marketable fruit numbers as well as fresh weight of a single fruit. It was shown that a higher level of nitrogen and potassium fertilization (350 N and 400 K mg dm -3 substrate) had a positive effect on the analyzed biometric parameters of fruits, except for fresh weight of a single fruit. Results of these investigations, confirmed by other authors, critically refer to the division of vegetable crops developed by Th. Geissler and Buchner into chloride- and sulfate-loving vegetable crops.

The effect of foliar feeding of potassium salts and urea in spinach on gas exchange, leaf yield and quality

Abstract: In a pot experiment conducted in a phytotron, the effectiveness of foliar feeding of different potassium salts, with and without the addition of 0.5% CO(NH 2 ) 2 , in spinach ( Spinacia oleracea L.) was investigated. Potassium was applied 3 times in the form of 1% solutions KCl, KNO 3 , K 2 SO 4 and C 6 H 5 K 3 O 7 •H 2 O, compared to water as the control treatment. The obtained results show that foliar feeding of potassium salts in spinach is an efficient method of supplementing the level of K + in plants during vegetation. Plants fed with KNO 3 had the highest content of potassium in leaves, and those fertilized with K 2 SO 4 , C 6 H 5 K 3 O 7 × H 2 O and KCl had an only slightly lower potassium content. The application of potassium salts resulted in more intensive gas exchange in leaves (stomatal conductance, photosynthesis, transpiration) and, as a consequence of that, increased leaf yield. Potassium nitrate and citrate influenced most effectively the abovementioned processes. The treatment of spinach with potassium salts resulted in an increased content of protein, chlorophyll, carotenoids, nitrates and iron as well as a decreased content of vitamin C and calcium in leaves.

Nitrogen Loss from Soils and Oxide Surfaces

Abstract: IT has been reported1 that when a virgin soil is brought under cultivation, the percentage of total nitrogen usually falls off with time up to a limiting value. A loss of nitrogen from soils on the addition of nitrogenous compounds, especially when the conditions are favourable for oxidation, has also been observed by different investigators; but this phenomenon has been explained satisfactorily by Dhar and collaborators2, who have postulated that this type of nitrogen loss in soils is chiefly due to the formation and decomposition of the unstable ammonium nitrite produced in the processes of ammonification and nitrification. There is also the possibility of the reaction of nitrous acid on amines, amides and amino-acids which may sometimes be present in the soil or formed in the decomposition of soil organicsubstances. It has also been reported that soil loses nitrogen in the form of nitrogen gas much less when manured with sodium or potassium nitrate than when treated with ammonium sulphate, urea or other organic nitrogenous manures.