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The toxicity of banded urea to corn growth and yield as influenced by triple superphosphate

Published on Feb 1, 1995in Canadian Journal of Soil Science0.949
· DOI :10.4141/cjss95-015
M. X. Fan1
Estimated H-index: 1
,
A. F. MacKenzie1
Estimated H-index: 1
Abstract
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 used. The field experiment was conducted on a Ste. Rosalie clay, a St. Bernard loam (Eutric Brunisol), and a Chicot sandy clay loam soil. In the growth chamber experiment, banded urea increased soil pH to 7.2–7.5 at a distance of up to 4 cm from the fertilizer band, and NH3 concentrations were as high as 2.1 mM at 2 cm from the fertilizer band after 20 d. The high pH and NH3 concentrations from urea hydrolysis inhibited corn root and seedling growth. Banding TSP with urea reduced soil pH increases from urea hydrolysis...
  • References (13)
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Improving efficient use of applied nutrients in crop production is a desirable agronomic, economic, and environmental goal. Field experiments with corn (Zea mays L.) were carried out at two sites with contrasting soil textures in southwestern Quebec from 1988 to 1990. Objectives were to establish an optimum N fertilization rate for grain production, and to study fertilizer N use efficiency on a Chicot sandy clay loam (Grey Brown Luvisol) and a Ste. Rosalie clay (Humic Gleysol). Under favourable ...
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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...
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Abstract Earlier research has shown that in a phosphorus (P) placement experiment the amount of increase in root proliferation in the fertilized volume, F, depended on the ratio of the available soil P levels in F and the unfertilized volume, U. The objective of this research was to determine the effect of the level of nitrogen (N) in F, and U on root proliferation in F. The research was conducted using the same procedures as were used for P. Corn (Zea mays L.) was grown in pots of soil where 20...
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