Mineralization of nitrogen from nitrogen-15 labeled crop residues and utilization by rice

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1990.03615995005400050025x· OSTI ID:5395754

Norman, R J ^[1]; Gilmour, J T; Wells, B R ^[2]

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1. Univ. of Arkansas, Stuttgart (USA)
2. Univ. of Arkansas, Fayetteville (USA)

The availability of N from the residues of the previous crop to the subsequent rice (Oryza sativa L.) crop is largely unknown. The objectives of this study were to (1) measure the mineralization of N from {sup 15}N-labeled rice, soybean (Glycine max L.), and wheat (Triticum aestivum L.) residues and the uptake by a subsequent rice crop; and (2) compare the {sup 15}N tracer method with the standard fertilizer-N response method used in field studies to quantify the N contribution from the crop residue to the next crop. Nitrogen mineralization from decomposing crop residues was measured by soil sampling prior to seeding the rice crop and after seeding by plant sampling the rice at maturity. The minimum estimate of the amount of residue N mineralized from the time of residue incorporation until rice harvest was 9, 52, and 38% of the rice, soybean, and wheat residue N, respectively. The amount of residue N recovered in the rice crop was 3, 11, and 37% of the rice, soybean, and wheat residue N, respectively. The lower the C/N ratio and the higher the amount of N in the residue, the lower was the amount of residue N recovered in the soil organic fraction at harvest and the higher was the amount of residue N mineralized. The {sup 15}N tracer method compared favorably with the fertilizer N response method when the uptake efficiency of the fertilizer N was taken into account.

• OSTI ID: 5395754
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 54:5; ISSN SSSJD; ISSN 0361-5995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540211 -- Environment
Terrestrial-- Basic Studies-- Radiometric Techniques-- (1990-)
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
BIOLOGICAL AVAILABILITY
CEREALS
ELEMENTS
FOOD
GRAMINEAE
GROWTH
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LILIOPSIDA
MAGNOLIOPHYTA
MINERALIZATION
NITROGEN
NITROGEN 15
NITROGEN ISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
PLANT GROWTH
PLANTS
RESIDUES
RICE
SOYBEANS
STABLE ISOTOPES
TRACER TECHNIQUES
VEGETABLES
WHEAT