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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
11/09/1996 |
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Data da última atualização: |
11/09/1996 |
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Autoria: |
VALLIS, I. |
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Afiliação: |
Division of Tropical Pasture, C.S.I.R.O., Mill Road, St. Lucia, Queensland, Australia. |
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Título: |
Sampling for soil nitrogen changes in large areas of grazed pastures. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
Communications in Soil Science and Plant Analysis, v.4, n.2, p.163-170, 1973. |
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Idioma: |
Inglês |
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Conteúdo: |
Lateral variation in soil N content was studied in five pastures to find the best method of sampling for precise estimates of changes in soil N content with time. Variation increased with sampling area up to, but not beyond, 1.2 - 2.4 ha. Consequently, the most efficient method of sampling for changes in N content was to repeatedly sample a fixed set of small sites. An allocation of 1-3 cores per siute was shown to be optimum. The number of cores needed to measure a change in N content in a field with a probability of 0.8 that the 0.95 confidence limits of the mean change would be within +- 50 kg N ha-1 ranged from 150 to 1000. |
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Palavras-Chave: |
Pasture; Soil nitrogen. |
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Thesagro: |
Nitrogênio; Pastagem; Solo. |
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Thesaurus Nal: |
sampling. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01155naa a2200193 a 4500
001 1789705
005 1996-09-11
008 1973 bl --- 0-- u #d
100 1 $aVALLIS, I.
245 $aSampling for soil nitrogen changes in large areas of grazed pastures.
260 $c1973
520 $aLateral variation in soil N content was studied in five pastures to find the best method of sampling for precise estimates of changes in soil N content with time. Variation increased with sampling area up to, but not beyond, 1.2 - 2.4 ha. Consequently, the most efficient method of sampling for changes in N content was to repeatedly sample a fixed set of small sites. An allocation of 1-3 cores per siute was shown to be optimum. The number of cores needed to measure a change in N content in a field with a probability of 0.8 that the 0.95 confidence limits of the mean change would be within +- 50 kg N ha-1 ranged from 150 to 1000.
650 $asampling
650 $aNitrogênio
650 $aPastagem
650 $aSolo
653 $aPasture
653 $aSoil nitrogen
773 $tCommunications in Soil Science and Plant Analysis$gv.4, n.2, p.163-170, 1973.
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Registro original: |
Embrapa Pantanal (CPAP) |
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