In:
Agronomy Journal, Wiley, Vol. 91, No. 6 ( 1999-11), p. 950-955
Abstract:
No‐tillage affects maize ( Zea mays L.) fertilizer N use efficiency when urea is surface‐applied, due to NH 3 volatilization. A 3‐year field experiment was conducted at Balcarce, Argentina (37°45′ S, 58°18′ W), on a soil complex of a fine, mixed, thermic Typic Argiudoll and a fine, illitic, thermic Petrocalcic Paleudoll. The objective was to evaluate the effect of surface‐applied urea rate (0, 35, 70, 140, and 210 kg N ha −1 ), with and without a urease inhibitor [ N ‐( n ‐butyl) thiophosphoric triamide] (nBTPT) at different times (planting; six‐leaf stage, V6) on NH 3 volatilization losses, soil mineral N, and maize N uptake and grain yield under no‐tillage. A semiopen static system was used to monitor NH 3 volatilization losses. Ammonia N losses from urea without nBTPT ranged between 2.6 and 13.3% of applied N, being greater with higher N rates and when the urea was applied at V6. Volatilization losses with nBTPT were not different than those from the control. The use of nBTPT did not increase soil mineral N consistently and did not increase N uptake nor grain yield. Relative to fertilization at planting, fertilization at V6 increased soil mineral N at flowering, N uptake at physiological maturity (167 and 155 kg ha −1 , respectively), and grain yield (11 003 and 10 440 kg ha −1 , respectively). For slightly acid and high organic matter soils, the use of nBTPT did not improve urea N use efficiency. Delayed urea application had a greater and more consistent effect than the use of nBTPT on the increase of no‐till maize grain yield and N use efficiency.
Type of Medium:
Online Resource
ISSN:
0002-1962
,
1435-0645
DOI:
10.2134/agronj1999.916950x
Language:
English
Publisher:
Wiley
Publication Date:
1999
detail.hit.zdb_id:
1471598-3
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