Nitrogen use efficiency and nitrogen-15 balances in broadcast-seeded flooded and transplanted rice

Conference · · Soil Science Society of America Journal; (USA)

OSTI ID:5436425

De Datta, S K; Buresh, R J; Samson, M I; Kai-Rong, Wang ^[1]

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1. IRRI, Manila (Philippines)

Increased irrigated areas, availability of short-duration modern rices (Oryza sativa L.) and cost-efficient herbicides, and high labor cost have motivated Asian farmers to shift from transplanting to broadcast seeding in flooded rice. Information on fate of N in broadcast-seeded flooded rice (BSFR), however, in Asia is limited. Thus, two field experiments were conducted on a Vertic Tropaquept to evaluate efficient N management practices in BSFR using {sup 15}N-labeled fertilizers and to compare the performance of BSFR and transplanted rice (TPR) under similar N management practices. For urea, basal deep placement (DP) as supergranules and a three-split application gave the lowest mean {sup 15}N losses and highest mean grain yields for BSFR. Mean {sup 15}N losses from urea applied to BSFR were 20 and 18%, respectively, for the researchers split (RS) and the farmers split (FS). The agronomic efficiency for 40 kg applied urea-N was 57, 43, and 28 with DP, RS, and FS, respectively.

• OSTI ID: 5436425
• Report Number(s): CONF-881108-; CODEN: SSSJD
• Journal Information: Soil Science Society of America Journal; (USA), Vol. 52:3; Conference: 52. annual meeting of the Soil Science Society, Anaheim, CA (USA), 27 Nov - 2 Dec 1988; ISSN 0361-5995
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
NITRATES
BIOLOGICAL AVAILABILITY
RICE
PRODUCTIVITY
ASIA
FERTILIZERS
IRRIGATION
NITROGEN 15
PLANT GROWTH
TRACER TECHNIQUES
TRANSPLANTS
UREA
AMIDES
CARBONIC ACID DERIVATIVES
CEREALS
GRASS
GROWTH
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LILIOPSIDA
MAGNOLIOPHYTA
NITROGEN COMPOUNDS
NITROGEN ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PLANTS
STABLE ISOTOPES
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
540211 - Environment
Terrestrial- Basic Studies- Radiometric Techniques- (1990-)
560300 - Chemicals Metabolism & Toxicology