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Titolo:
Nitrogen budget of wheat growing on a Riverine clay soil
Autore:
Smith, CJ; Dunin, FX; Poss, R; Angus, JF;
Indirizzi:
CSIRO Land & Water, Canberra, ACT 2601, Australia CSIRO Land & Water Canberra ACT Australia 2601 berra, ACT 2601, Australia CSIRO Plant Ind, Canberra, ACT 2601, Australia CSIRO Plant Ind Canberra ACT Australia 2601 Canberra, ACT 2601, Australia
Titolo Testata:
AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH
fascicolo: 7, volume: 51, anno: 2000,
pagine: 867 - 876
SICI:
0004-9409(2000)51:7<867:NBOWGO>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-USE; N-15-LABELED FERTILIZER; WINTER-WHEAT; ACIDIFICATION; YIELD; ACCUMULATION; PLANT; ENVIRONMENT; CEREALS; LEGUMES;
Keywords:
bromide; denitrification; nitrate leaching; mineralisation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Smith, CJ CSIRO Land & Water, GPO Box 1666, Canberra, ACT 2601, Australia CSIRO Land & Water GPO Box 1666 Canberra ACT Australia 2601 alia
Citazione:
C.J. Smith et al., "Nitrogen budget of wheat growing on a Riverine clay soil", AUST J AGR, 51(7), 2000, pp. 867-876

Abstract

The fate of nitrogen in wheat grown on a Mesotrophic, Red Kandosol near Wagga Wagga was studied in the 1993 growing season, which had above-average rainfall: 417 mm (31 May-30 November 1993) compared with an average (June-November) of 289 mm. Nitrogen supply (fertiliser and mineralisation) was partitioned between crop uptake, gaseous and leaching losses, and residual mineral N in the soil profile. The study plots were 2 adjacent 5-ha areas. At stem elongation (Zadock's decimal code 31), one area was topdressed with urea at 14 g N/m(2) (fertilised crop). The total N supply to the fertilised crop was 29 g N/m(2)-8 g N/m(2) of mineral N in the soil at sowing, net mineralisation of 5.3 g N/m(2), and fertiliser inputs of 1.7 and 14 g N/m(2). The corresponding value for the non-fertilised crop was 15 g N/m(2). The urea application produced a 50% increase in above-ground biomass (1521and 1008 g/m(2) dry matter at harvest) and a 1.8-fold increase in grain yield (692 and 384 g/m(2)). The proportion of the total N supply recovered inthe crops was similar (55% and 60% for the non-fertilised and fertilised treatments, respectively). Leaching losses were low (0.4 and 0.5 g N/m(2)), even though approximate to 100 mm drained beyond the root-zone (equivalent to 24% of the seasonal rainfall). The periods of saturated soil required togenerate drainage also caused denitrification losses of 1.7 and 3.4 g N/m(2) for the non-fertilised and fertilised treatments, respectively. Increased net mineralisation and reduced crop N uptake that began a month prior to anthesis were responsible for the substantial amounts of mineral N remaining in the soil after harvest (4.7 and 4.3 g N/m(2), respectively). The low NO3 leaching loss associated with high drainage was explained by displacement flow mechanics operating in soil that has a high water retention capacity, which is confirmed by Br and N-15 tracer analysis. The N balance was closed for the non-fertilised crop, but a discrepancy of 2.8 g N/m(2) remains for the fertilised crop. The uncertainty of approximate to 10% of the fertilised treatment may possibly be due to ammonia volatilisation following topdressing with urea.

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Documento generato il 22/10/20 alle ore 02:15:47