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Published in Soil Sci Soc Am J 34:335-339 (1970)
© 1970 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Slow-Release Nitrogen Sources on Merion Kentucky Bluegrass1

E. L. Moberg, D. V. Waddington and J. M. Duich2

ABSTRACT

Various slow-release nitrogen sources were used to fertilize ‘Merion’ Kentucky bluegrass (Poa pratensis L.) for two growing seasons. Slow-release sources were ureaform, activated sewage sludge, ADM (a coated urea), Urex (a urea-paraffin product), and IBDU (isobutylidene diurea). Response to fertilization was measured by weekly determinations of clipping yield and color rating. Urex performed similarly to ADM, and response following application was quicker and greater than that from ureaform, sewage sludge, and IBDU. IBDU showed good controlled release characteristics, but initial response after fertilization was slow. Residual effects of IBDU gave green color earlier in the spring than other treatments. Nitrogen recovery in the clippings was determined. Recovery ranged from 54% for ADM to 22% for ureaform over the 2-year period. Recovery from sewage sludge was 27%. The highest recoveries for IBDU and Urex treated plots were 46% and 52%, respectively. Recovery from a urea treatment was 52%.

NOTES

1 Contribution from Penn. Agr. Exp. Sta., University Park, Pa. 16802. Journal Paper no. 3632. Adapted from a thesis by the senior author presented to the faculty of the graduate school of The Penn. State Univ., March 1969, in partial fulfillment of the requirements for the degree of Master of Science. Presented before Div. S-8 of the Soil Science Society of America, New Orleans, La. Nov. 11, 1968.

2 Graduate Assistant, Associate Professor, and Professor, Department of Agronomy, The Penn. State Univ.

Received for publication August 22, 1969. Accepted for publication September 19, 1969.






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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1970 by the Soil Science Society of America.