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Soluble and slow-release nitrogen fertilizer effects on grass forage, as influenced by rate and placement

Published online by Cambridge University Press:  27 March 2009

S. E. Allen ,
G. L. Terman  and
C. M. Hunt
S. E. Allen
Affiliation:
National Fertilizer Development Centre, Tennessee Valley Authority, Muscle Shoals, Alabama, U.S.A.
G. L. Terman
Affiliation:
National Fertilizer Development Centre, Tennessee Valley Authority, Muscle Shoals, Alabama, U.S.A.
C. M. Hunt
Affiliation:
National Fertilizer Development Centre, Tennessee Valley Authority, Muscle Shoals, Alabama, U.S.A.
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Summary

Soluble ammonium nitrate (AN) and urea were compared with slow-release oxamide and sulphur-coated urea (SCU) as N sources for clipped annual ryegrass (Lolium multiflorum) or common bermuda grass (Cynodon dactylon) in four greenhouse experiments. Mixed and surface applications of a wide range of N rates were evaluated for 9 to 14 cuttings of grass forage. Both granular oxamide and SCU exhibited slow-release N properties, especially when surface-applied. Uptake distribution of N with high application rates of AN and urea tended to resemble that with the slow-release sources. Slow-release properties of oxamide and SCU were accentuated at high application rates. Lower N recovery from surface-applied urea than from AN indicated volatilization loss of urea N. Volatilization loss also occurred with oxamide, but low N recovery from oxamide and SCU resulted largely from incomplete dissolution of the granules during the 18- to 34-week experimental periods. Very low N recovery was obtained from urea formaldehyde having an activity index of 42.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 3 , December 1971 , pp. 397 - 404
Copyright
Copyright © Cambridge University Press 1971

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References

REFERENCES

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