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Influence of Conservation Tillage and Soil Water Content on Crop Yield in Dryland Compacted Alfisol of Central Chile Chilean J. Agric. Res.
Martinez G,Ingrid; Ovalle,Carlos; Del Pozo,Alejandro; Uribe,Hamil; Valderrama V,Natalia; Prat,Christian; Sandoval,Marco; Fernández,Fernando; Zagal,Erick.
Chilean dryland areas of the Mediterranean climate region are characterized by highly degraded and compacted soils, which require the use of conservation tillage systems to mitigate water erosion as well as to improve soil water storage. An oat (Avena sativa L. cv. Supernova-INIA) - wheat (Triticum aestivum L. cv. Pandora-INIA) crop rotation was established under the following conservation systems: no tillage (Nt), Nt + contour plowing (Nt+Cp), Nt + barrier hedge (Nt+Bh), and Nt + subsoiling (Nt+Sb), compared to conventional tillage (Ct) to evaluate their influence on soil water content (SWC) in the profile (10 to 110 cm depth), the soil compaction and their interaction with the crop yield. Experimental plots were established in 2007 and lasted 3 yr till...
Tipo: Journal article Palavras-chave: Neutron probe; Penetrometer resistance; Oat; Subsoiling; Water erosion; Wheat.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400018
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Neutron probe calibration correction by temporal stability parameters of soil water content probability distribution Scientia Agricola
Reichardt,K.; Portezan,O.; Bacchi,O.O.S.; Oliveira,J.C.M; Dourado-Neto,D.; Pilotto,J.E.; Calvache,M..
A neutron probe calibration correction is proposed in order to reduce soil water content variability, assumed to be a consequence of improper calibrations relations. The time stability of spatially measured soil water content data is used to correct the intercepts of linear calibration relations. This procedure reduced the coefficients of variation of soil water content data from 4 to less than 2% in a Rhodic Kanhapludalf.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil water content; Neutron probe; Calibration; Time stability; Spatial variability.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000300003
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Neutron probe measurement of soil water content close to soil surface Scientia Agricola
Falleiros,M.C.; Ravelo Sanchez,A.; Souza,M.Dornelas de; Bacchi,O.O.S.; Pilotto,J.E.; Reichardt,K..
The problem of neutron probe soil water content measurements close to soil surface is analysed from the spatial variability and also from the slow neutron "loss" to the atmosphere points of view. Results obtained on a dark red latosol of the county of Piracicaba,SP, indicate the possibility of precisely measuring the neutron "sphere of influence" when different media are used on soil surface.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neutron probe; Soil water content; Spatial variability.
Ano: 1993 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000300002
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Soil hydraulic conductivily measurement on a sloping field AGRIAMBI
Timm,Luís Carlos; Oliveira,Julio Cesar Martins de; Tominaga,Tânia Toyomi; Cássaro,Fábio Augusto Meira; Reichardt,Klaus; Bacchi,Osny Oliveira Santos.
A field methodology is presented for the measurement of the soil hydraulic conductivity in a sloping field, minimizing the leveling soil movement before water pounding and redistribution. The assurance of vertical flow only is performed through soil water potential isolines. The hydraulic conductivity was determined by the instantaneous profile method. Results for the nine neutron probe access tubes indicate that one single K(theta) relation is sufficient to represent the experimental site.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydraulic conductivity; Slope; Neutron probe.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662000000300027
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Soil moisture calibration of TDR multilevel probes Scientia Agricola
Serrarens,Daniel; MacIntyre,Jim L.; Hopmans,Jan W.; Bassoi,Luis H..
Time domain reflectometry (TDR) probes are increasingly used for field estimation of soil water content. The objective of this study was to evaluate the accuracy of the multilevel TDR probe under field conditions. For this purpose, eight such TDR probes were installed in small plots that were seeded with beans and sorghum. Data collection from the probes was such that soil moisture readings were automated and logged using a standalone field unit. Neutron probe measurements were used to calibrate the TDR probes. Soil-probe contact and soil compaction were critical to the accuracy of the TDR, especially when a number of TDR probes are combined for a single calibration curve. If each probe is calibrated individually, approximate measurement errors were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: TDR; Soil water content; Neutron probe.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162000000200024
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