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Availability Characteristics Of and Plant Response to Nitrogen Sources
Author(s) -
McCants C. B.
Publication year - 1969
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1969.00021962006100030004x
Subject(s) - cottonseed meal , urea , wax , nitrogen , lysimeter , leaching (pedology) , agronomy , chemistry , urea formaldehyde , formaldehyde , cottonseed , zoology , sorghum , environmental science , raw material , soybean meal , food science , biology , biochemistry , organic chemistry , soil water , adhesive , layer (electronics) , soil science
The relative availability characteristics of nitrogen in urea, cottonseed meal, a commercial urea‐formaldehyde product, and an experimental urea‐wax material were studied through successive leachings in model lysimeters in the laboratory and by leaching and plant growth in the greenhouse. The effects of the nitrogen sources on yield and chemical composition of field‐grown tobacco were studied under different moisture regimes. The total release of nitrogen from the urea‐wax source was comparable to that from urea but significantly higher than from urea‐formaldehyde or cottonseed meal sources. The rate of N release during the first 21 days was not different among the urea‐wax, urea‐formaldehyde, and cottonseed meal sources; thereafter, it was higher from urea‐wax. When differences in crop response occurred among the different sources, the yield and quality index were higher from urea‐wax than from cottonseed meal or urea‐formaldehyde. These results and data from other research suggest that the probability of practical contributions of slow release fertilizers in the commercial production of annual field crops is quite small.