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Titolo:
FATE OF N-15-LABELED FERTILIZER APPLIED TO SPRING BARLEY GROWN ON SOILS OF CONTRASTING NUTRIENT
Autore:
GLENDINING MJ; POULTON PR; POWLSON DS; JENKINSON DS;
Indirizzi:
AFRC,INST ARABLE CROPS RES,DEPT SOIL SCI HARPENDEN AL5 2JQ HERTS ENGLAND
Titolo Testata:
Plant and soil
fascicolo: 1, volume: 195, anno: 1997,
pagine: 83 - 98
SICI:
0032-079X(1997)195:1<83:FONFAT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
WINTER-WHEAT; NITROGEN LOSSES; FIELD; RECOVERY; N-15; EFFICIENCY; UREA; CROP; ATMOSPHERE; EXCHANGE;
Keywords:
LOSSES OF FERTILIZER N; N-15-LABELED FERTILIZER; N FERTILIZER USE EFFICIENCY; SOIL ORGANIC MATTER; SPRING BARLEY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Glendining et al., "FATE OF N-15-LABELED FERTILIZER APPLIED TO SPRING BARLEY GROWN ON SOILS OF CONTRASTING NUTRIENT", Plant and soil, 195(1), 1997, pp. 83-98

Abstract

An experiment with N-15-labelled fertilizer was superimposed on the Rothamsted Hoosfield Spring Barley Experiment, started in 1852. Labelled (NH4)-N-15 (NO3)-N-15 was applied in spring at (nominal) rates of 0,48, 96 and 144 kg N ha(-1). The labelled fertilizer was applied to microplots located within four treatments of the original experiment: that receiving farmyard manure (FYM) annually, that receiving inorganic nutrients (PK) annually and to two that were deficient in nutrients: applications were made in two successive years, but to different areas within these original treatments. Maximum yields in 1986 (7.1 t grain ha(-1)) were a little greater than in 1987. In 1987, microplots on theFYM and PK treatments gave similar yields, provided enough fertilizerN was applied, but in 1986 yields on the PK treatment were always less than those on the FYM treatment, no matter how much fertilizer N wasapplied. In plots with adequate crop nutrients, about 51% of the labelled N was present in above-ground crop and weed at harvest, about 30%remained in the top 70 cm of soil (mostly in the 0-23 cm layer) and about 19% was unaccounted for, all irrespective of the rate of N application and of the quantity of inorganic N in the soil at the time of application. Less than 4% of the added fertilizer N was present in inorganic form in the soil at harvest, confirming results from comparable experiments with autumn-sown cereals in south-east England. Thus, in this experiment there is no evidence that a spring-sown cereal is more likely to leave unused fertilizer in the soil than an autumn-sown one. With trace applications (ca. 2 kg N ha(-1)) more labelled N was retained in the soil and less was in the above-ground crop. Where P and K were deficient, yields were depressed, a smaller proportion of the labelled fertilizer N was present in the above-ground crop at harvest and more remained in the soil. Although the percentage uptake of labelled Nwas similar across the range of fertilizer N applications, the uptakeof total N fell off at the higher N rates, particularly on the FYM treatment. This was reflected in the appearance of a negative Added Nitrogen Interaction (ANI) at the highest rate of application. Fertilizer N blocked the uptake of soil N, particularly from below 23 cm, once the capacity of the crop to take up N was exceeded. Denitrification and leaching were almost certainly insufficient to account for the 19% loss of spring-added N across the whole range of N applications and otherloss processes must also have contributed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/08/20 alle ore 18:38:18