Balance sheet of15N labelled urea applied to rice in three Australian vertisols differing in soil organic carbon

Zia M.S. and Waring S.A. (1987) Balance sheet of15N labelled urea applied to rice in three Australian vertisols differing in soil organic carbon. Fertilizer Research, 12 1: 53-65. doi:10.1007/BF01049420


Author Zia M.S.
Waring S.A.
Title Balance sheet of15N labelled urea applied to rice in three Australian vertisols differing in soil organic carbon
Journal name Fertilizer Research
ISSN 0167-1731
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1007/BF01049420
Volume 12
Issue 1
Start page 53
End page 65
Total pages 13
Publisher Kluwer Academic Publishers
Subject 1111 Nutrition and Dietetics
Abstract A glasshouse experiment was conducted to study the balance sheet of15N labelled urea at three rates (zero, 31.48 and 62.97 mmol N pot-1) applied to rice under flooded conditions with two moisture regimes (continuous and alternate flooding) using three Australian vertisols differing in organic carbon level. Walkley-Black organic carbon values for the three soils were 0.65, 2.13 and 3.76 for the low carbon (LC), medium carbon (MC) and high carbon (HC) soils respectively. Rice dry weight and nitrogen uptake was significantly affected by N fertilizer rates, water regimes and soils. Alternate flooding gave much lower dry weight and nitrogen uptake than continuous flooding and the LC soil gave lower dry weight and nitrogen uptake than for the MC and HC soils. Recovery of15N labelled urea fertilizer in the rice plant was low (15.4 to 38.4%) and the15N urea not accounted for in the plant or soil and presumed lost was high (36.2 to 76.0%). Recovery was lower and loss higher under alternate flooding and for the LC soil. There was no effect of fertilizer rate. The results obtained stress the need for careful management to reduce losses of nitrogen fertilizer, particularly for soils low in organic carbon.
Keyword 15N
balance sheet
nitrogen losses
rice
soil organic carbon
urea
vertisols
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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