Hygroscopicity of complex fertilizers. Effect of calcium nitrate and water concentrations on the critical relative humidity of ammonium nitrate-limestone

1968 ◽  
Vol 16 (3) ◽  
pp. 384-387
Author(s):  
Ross. Latham ◽  
Paul R. Geissler
Keyword(s):  
Relative Humidity ◽  
Ammonium Nitrate ◽  
Calcium Nitrate ◽  
Critical Relative Humidity

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

Experimental Study on Hygroscopicity of Rapeseed (Brassica Napus)

2012 ◽  
Vol 479-481 ◽  
pp. 2275-2278
Author(s):  
Ming Jin Yang ◽  
Wu Ming Xu ◽  
Tian Tang ◽  
Ling Yang ◽  
Feng Liu
Keyword(s):  
Experimental Study ◽  
Brassica Napus ◽  
Relative Humidity ◽  
Moisture Absorption ◽  
Early Period ◽  
Critical Relative Humidity ◽  
Temperature And Humidity ◽  
Higher Temperature

The hygroscopicity property of the rapeseed at different temperature and humidity was experimental studied in this paper. Tested results show that: the moisture absorption rates increase with the increase of relative humidity at the early period of absorption, and higher temperature leads to earlier reach of moisture equilibrium; the critical relative humidity(CRH) increases with the increase of temperature; the optional relative humidity for safety storage of rapeseed should be controlled less than 60%.

scholarly journals Calculating the Critical Relative Humidity from the Solubility of Electrolyte According to Extended Non-random Two Liquid Model

2009 ◽  
Vol 57 (9) ◽  
pp. 943-947 ◽  
Author(s):  
Yingli Wang ◽  
Xiancheng Zhan ◽  
Chaoqun Xiang ◽  
Jia Chen ◽  
Lan Cao ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Liquid Model ◽  
Critical Relative Humidity

scholarly journals Nutrient nitrogen management for disease control in strawberry

2008 ◽  
Vol 61 ◽  
pp. 70-79 ◽  
Author(s):  
M. Walter ◽  
B. Braithwaite ◽  
B.J. Smith ◽  
G.I. Langford
Keyword(s):  
Ammonium Nitrate ◽  
Ammonium Sulphate ◽  
Disease Susceptibility ◽  
Disease Risk ◽  
Calcium Nitrate ◽  
Colletotrichum Acutatum ◽  
N Application ◽  
Flower Production ◽  
Berry Size ◽  
Important Disease

Botrytis cinerea and Colletotrichum acutatum are important strawberry pathogens Nitrogen (N) application can increase yield but also susceptibility to pathogens Strawberry plants (Camarosa and Ventana) were grown in sand fertilised with base nutrients plus ammonium nitrate ammonium sulphate or calcium nitrate at low (40 ppm N) and high (140 ppm N) concentration Controls consisted of base nutrients only and water only Flower production fruit yield and berry size all increased with increasing Nconcentration but Nsource itself was not important Disease susceptibility was affected by both Nconcentration and Nsource At high Nconcentration C acutatum fruit lesions were largest in ammonium sulphate treatments > ammonium nitrate > calcium nitrate; Botryits cinerea lesions were largest in ammonium nitrate > ammonium sulphate > calcium nitrate Similar trends were observed for leaf susceptibility to the two pathogens These data suggest that calcium nitrate may be a suitable source of nitrogen helping growers to reduce disease risk

scholarly journals Calcium nitrate and ammonium nitrate limestone as sources of nitrogen for oats and barley

1961 ◽  
Vol 33 (1) ◽  
pp. 159-168
Author(s):  
Pentti Hänninen ◽  
Armi Kaila
Keyword(s):  
Ammonium Nitrate ◽  
Nitrogen Content ◽  
Calcium Nitrate ◽  
Field Trials ◽  
The Other ◽  
Nitrogen Fertilizers ◽  
Malting Barley ◽  
Growing Period ◽  
Significant Difference ◽  
Cent Level

Calcium nitrate and ammonium nitrate limestone (»Oulunsalpietari») were compared as the nitrogen fertilizer for oats in 15 field trials and for barley in one trial. The trials were carried out in summers 1959 and 1960 in various places in Finland. The split plot technique was employed in order to reduce the variation as much as possible. In 1959 the amounts of nitrogen applied as these two fertilizers to the corresponding halves of the plots were 25 and 50 kg/ha. In 1960 also higher applications were used: 75 and 100 kg/ha of N. In three trials these fertilizers were compared both as a surface dressing and worked in. Visual observations suggested about 5—6 weeks after sowing a darker green colour in the stands treated with calcium nitrate as compared with the other half treated with ammonium nitrate limestone. These differences later disappeared. In some trials a higher nitrogen content of the plants from the calcium nitrate stands could be demonstrated during this period. The uptake of nitrogen by plants was regularly followed throughout the growing period. Owing to the large variation, usually, no statistically significant difference between the effect of the fertilizers could be detected. In a few cases the superiority of calcium nitrate could be demonstrated. No differences in the ripening could be found. In most trials there was a fairly regular tendency to higher yields and higher nitrogen content in the grain and straw produced by calcium nitrate. Yet, only in a few cases were the differences statistically significant at the five per cent level. Thus, it was concluded that on the basis of the results of these trials ammonium nitrate limestone and calcium nitrate may be considered practically equal as nitrogen fertilizers for oats. There was no difference in the yields of barley produced by these two fertilizers, but the nitrogen content of grains was significantly lower with ammonium nitrate limestone than with calcium nitrate. This may be worth further study in connection with the production of malting barley.

Fertilisation azotée en forêt de pin gris (Pinusbanksiana). I. Cheminement des engrais dans le sol

1981 ◽  
Vol 11 (2) ◽  
pp. 414-422
Author(s):  
C. Camiré ◽  
B. Bernier
Keyword(s):  
Ammonium Nitrate ◽  
Ammonium Sulfate ◽  
Nitrogen Availability ◽  
Urea Formaldehyde ◽  
Calcium Nitrate ◽  
Nitrogen Retention ◽  
Jack Pine ◽  
Nitrogen Fertilizers ◽  
Original Form ◽  
Coated Urea

Six nitrogen fertilizers (urea, sulfur-coated urea, urea-formaldehyde, ammonium nitrate, ammonium sulfate, and ammonium nitrate) were individually applied, either in fall or in spring, at a rate of 224 kg N/ha and compared for nitrogen retention in the different horizons of a podzol under jack pine. Despite its susceptibility to nitrogen losses through ammonia volatilization, urea was by far, among readily available nitrogen fertilizers, the one whose nitrogen is best retained in soil surface horizons. Retention varied with weather conditions that prevailed immediately after fertilizer application. With the other fertilizers used, nitrogen retention followed this order: ammonium sulfate > ammonium nitrate > calcium nitrate. After four seasons, about 50% of the nitrogen applied as sulfur-coated urea and urea-formaldehyde was still found in its original form. Ammonium sulfate is next to urea among the recommended nitrogen sources for similar jack pine sites, considering that fertilizers with nitrate are prone to leaching and the sulfur-coated urea and urea-formaldehyde used presented problems of nitrogen availability.

Ten-year growth results of nitrogen source and interprovincial experiments on jack pine

1984 ◽  
Vol 14 (3) ◽  
pp. 424-430 ◽  
Author(s):  
G. F. Weetman ◽  
R. M. Fournier
Keyword(s):  
Ammonium Nitrate ◽  
Calcium Nitrate ◽  
Jack Pine ◽  
Fertilizer Efficiency ◽  
Fertilizer Use ◽  
Stand Growth ◽  
Volume Response ◽  
Urea Ammonium Nitrate ◽  
Repeated Applications ◽  
N Fertilizer Efficiency

Sample plots in a 45-year-old jack pine (Pinusbanksiana Lamb.) stand in Quebec were fertilized with urea, ammonium nitrate, and calcium nitrate in single applications of 112 or 448 kg N/ha. There were no significant differences in periodic volume response owing to the form of N added; applications of 112 kg N/ha gave temporary increases in stand growth which lasted 4–5 years, while applications of 448 kg N/ha produced responses lasting 7–8 years. In an experiment of the standardized interprovincial series no significant differences in periodic volume response were found although there was an indication of increased response to the addition of P with N. Fertilizer efficiency was examined for single and repeated applications on the site. The most efficient fertilizer use was with repeated light applications of 56 kg N/ha, requiring 8 kg N for every cubic metre per hectare produced.

CALCIUM NITRATE COMPARED WITH AMMONIUM NITRATE AS A FERTILIZER AND AMENDMENT FOR SOLONETZIC SOILS

1980 ◽  
Vol 60 (3) ◽  
pp. 587-589 ◽  
Author(s):  
R. R. CAIRNS ◽  
R. S. LAVADO ◽  
G. R. WEBSTER
Keyword(s):  
Physical Properties ◽  
Ammonium Nitrate ◽  
Soil Acidity ◽  
Calcium Nitrate ◽  
Beneficial Effects ◽  
Solonetz Soil

Application of Ca(NO3)2 to a Black Solonetz soil at Vegreville, Alberta provided the known beneficial effects of NH4NO3 in increasing yields and improving the chemical and physical properties of the Ap and Bnt horizons without the harmful increase in soil acidity associated with the use of NH4NO3.

The atmospheric conditions affecting sporulation of blue mould in tobacco

1964 ◽  
Vol 4 (13) ◽  
pp. 178 ◽  
Author(s):  
BG Collins
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Air Temperature ◽  
Critical Parameter ◽  
Leaf Surface ◽  
Atmospheric Conditions ◽  
Blue Mould ◽  
Growing Seasons ◽  
Ambient Relative Humidity ◽  
Critical Relative Humidity

Conditions favouring sporulation of blue mould (Peronospora tabacina Adam) having been established in the laboratory, a theoretical model has now been used to express the critical parameter, i.e. the relative humidity near the leaf surface where the spores form, in terms of the ambient atmospheric conditions. To test the validity of this model, wind speed, air temperature, and relative humidity mere measured over four growing seasons in three tobacco crops in the Ovens Valley, Victoria, and related to times of sporulation of the mould observed concurrently in these crops. 'Critical relative humidity,' a function of wind speed, air temperature, and heat loss from the crop is shown to be a more serviceable indicator of likelihood of sporulation than either ambient relative humidity or rainfall.

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