A modified urea based NP fertilizer: urea-TSP-MAP combinations

Published on Jan 1, 1996in Nutrient Cycling in Agroecosystems2.848
· DOI :10.1007/BF00748592
M. X. Fan3
Estimated H-index: 3
(McGill University),
A. F. MacKenzie5
Estimated H-index: 5
(McGill University),
H. D. Blenkhorn1
Estimated H-index: 1
(McGill University)
Applying urea with acidic phosphate fertlizer increases urea fertilizer efficiency by reducing ammonia volatilization and toxicity to crop from urea hydrolysis. However, urea and triple superphosphate (TSP) are not recommended to be cogranulated because blends might become wet and sticky. Monoammonium phosphate (MAP) is a less acidic P source than TSP, but is compatible with urea. The objective of this study was to evaluate compound NP fertilizer products made from MAP and TSP combinations as P sources with urea. Fertilizer mixtures were pelletized from commercial urea, TSP and MAP with different N:P2O5 ratios and MAP/TSP combinations. Moisture changes during storage, pH of fertilizer solutions, and ammonia volatilization from surface applied fertilizer pellets were measured. Using MAP with TSP in urea-P mixtures reduced moisture increases during storage. Increasing MAP in urea-TSP-MAP combinations increased fertilizer solution pH by over 1 unit as the MAP/TSP-P2O5 ratio increased from 0/100 to 100/0. Adding MAP as 50% of P in urea-MAP-TSP mixtures at 3:1 and 1.5: (N:P2O5) ratios reduced ammonia loss from urea 50% to 60% compared to urea alone; and ammonia loss was similar to that of urea-TSP combinations. A urea-TSP-MAP fertilizer combination could make efficient use of urea-N by crops by reducing ammonia loss from urea hydrolysis.
  • References (5)
  • Citations (5)
📖 Papers frequently viewed together
3 Citations
1 Citations
78% of Scinapse members use related papers. After signing in, all features are FREE.
Banding of urea in corn (Zea mays L.) production is restricted by toxic conditions from urea hydrolysis, but higher urea rates could reduce application cost. A growth chamber experiment and a field experiment were conducted to study toxicity of banded urea when applied with triple super-phosphate (TSP). In the growth chamber experiment, surface samples from a Ste. Rosalie clay (Humic Gleysol), a Chicot sandy clay loam (Grey-brown Podzol), and an Uplands sandy soil (Humo Ferric, Podzol), were use...
13 CitationsSource
Low fertilizer P use efficiency is a problem in crop production on acid soils, but efficiency can be affected by methods of fertilizer application. A field experiment was conducted on two eastern Canadian soils (fine-silty to fine, mixed, frigid Typic Humaquepts) with different pH (5.0 and 6.0 initially) to evaluate the effect of banding different rates of urea with acidic P fertilizers on corn (Lea mays L.) yield and fertilizer use efficiency. Three rates of urea (0, 30, and 60 kg N ha ) banded...
18 CitationsSource
#1E. AasamäeH-Index: 1
#2E. ArumeelH-Index: 1
Last. M. VeidermaH-Index: 1
view all 4 authors...
A laboratory study was conducted to elaborate methods for obtaining granular NPK fertilizers from mixtures of single superphosphate (SSP) with urea and potassium salts. Samples of products of various grades containing 32–39% fertilizer nutrients and some micronutrients (B, Cu, Co, Mo, Mn) were obtained and their characteristics determined. Instead of cured SSP the usage of a fresh den product was recommended to reduce environmental pollution. The best results were obtained by drying den superpho...
1 CitationsSource
74 CitationsSource
#1S. H. Chien (International Fertilizer Development Center)H-Index: 23
#2C. B. Christianson (International Fertilizer Development Center)H-Index: 8
Last. G. E. Peters (International Fertilizer Development Center)H-Index: 1
view all 4 authors...
It has been the experience of the fertilizer industry that urea should not be cogranulated or blended with superphosphate because urea reacts with monocalcium phosphate monohydrate (MCP·H2O) in superphosphate to form an adduct. This reaction releases the water of hydration and causes the product to become wet and sticky or severely caked during storage. The objectives of this study were [1] to test the feasibility of preventing or retarding the reaction by complexing the urea with various salt h...
6 CitationsSource
Cited By5
#1Sherub PhuntshoH-Index: 27
6 Citations
#1V. R. Haden (Cornell University)H-Index: 6
#2Jing Xiang (Rice University)H-Index: 3
Last. John M. Duxbury (Cornell University)H-Index: 31
view all 8 authors...
Recent studies have documented adverse affects of urea on the establishment and growth of aerobic rice when applied at seeding. The following experiments were conducted to examine the relative importance of ammonia and nitrite (NO) toxicities as mechanisms contributing to poor germination and early growth of aerobic rice. Soil was collected from an experiment in the Philippines where aerobic rice was grown continuously for 7 years. Subsamples of the soil were: (1) pretreated with sulfuric acid (...
20 CitationsSource
Problem statement: Exchangeable ammonium (NH4+) could be recovered by humic and fulvic acids from humic substances. The ability of these acids in fixing or retaining NH4+ has been demonstrated in many findings and reports. Both acids could affect the plant growth, nutrients uptake by enhancing photosynthesis rate and root growth among others. Thus, in this study, the effect of both acids (in liquid form) on soil exchangeable NH4+, dry matter production and available nitrate (NO3-) was investigat...
14 CitationsSource
#1Sven G. SommerH-Index: 44
#2Jan K. SchjoerringH-Index: 57
Last. O. T. Denmead (CSIRO: Commonwealth Scientific and Industrial Research Organisation)H-Index: 37
view all 3 authors...
Abstract A thorough understanding of the physical and chemical processes involved in NH 3 emission from inorganic N fertilizers and fertilized crops is required if reliable and operational NH 3 emission factors and decision support systems for inorganic fertilizers are to be developed, taking into account the actual soil properties, climatic conditions and management factors. For this reason, the present review focuses on processes involved in NH 3 volatilization from inorganic nitrogen fertiliz...
225 CitationsSource