Papers by Juan Carlos Silenzi
A simplified rotary sieve for estimating the wind erodibility of soils
Microbial gums content in an undisturbed soil and its relationship with structural stability
Ciencia del Suelo, Dec 2, 1988
* Se considera que el viento erosiona el suelo a partir de una velocidad de 8 ms 1 (Lyles, 1983; ... more * Se considera que el viento erosiona el suelo a partir de una velocidad de 8 ms 1 (Lyles, 1983; Stout y Zobeck, 1996) * Resultados propios obtenidos a partir del procesamiento de la información que aporta
Soil compaction and energetic demand of a paratill plow at three depths and two working widths
Subsolado En Siembra Directa: Efectos Sobre Parámetros Físicos Del Suelo y El Rendimiento De Soja
La compactacion de suelos constituye un fenomeno frecuente en muchas regiones agricolas del mundo... more La compactacion de suelos constituye un fenomeno frecuente en muchas regiones agricolas del mundo. En la Argentina esta contingencia se ha incrementado en los ultimos anos como consecuencia del proceso de expansion de la agricultura y al avance de la siembra directa. El objetivo de este trabajo fue evaluar el resultado del subsolado sobre propiedades fisicas de un Paleudol Petrocalcico, su residualidad en el tiempo y rendimiento del cultivo de soja (Clycine max [L.] Merr.). Se realizo una labor con arado paratill sobre un suelo en siembra directa en el partido de Tres Arroyos, determinando dos tratamientos, testigo (T) y labrado con paratill (TMD) previo a la implantacion de soja. Los resultados del subsolado indicaron: escasa a nula diferencia entre los contenidos gravimetricos de agua en el suelo durante los 18 meses posteriores a la labranza; reduccion de la resistencia mecanica a la penetracion (RP) hasta los 17,5 cm de profundidad durante 18 meses; disminucion de la densidad ap...
Sunflower (Helianthus annus L.) hull as an organic amendment and its effects on soil properties
Economics of Land Degradation and Improvement – A Global Assessment for Sustainable Development, 2015
Aeolian Research, 2012
In the SW of Buenos Aires Province, Argentina, wind erosion in a smooth field with no vegetation ... more In the SW of Buenos Aires Province, Argentina, wind erosion in a smooth field with no vegetation cover was measured during the April-November period, 2009. Mean wind speed (measured at 2 m high) of the 14 recorded storms was 32.5 km h À1. Nine surface collectors and 27 BSNE dust samplers, three per tower, distributed in a 1 ha-plot were used. Mass flux decreased with height, fitting to an exponential equation, and increased with distance. Nearsurface mass flux (0.07 m) represented between 70% and 90% of the total transported material. Soil loss for the entire sampled period was 56.8 t ha À1. Considering that soil particle movement was greater near the surface, strategies to control wind erosion promoting the use of conservation tillage may be planned.
Aeolian Research, 2012
Wind erosion risk (WER) for soils of each municipality in the southwest (SW) of Buenos Aires Prov... more Wind erosion risk (WER) for soils of each municipality in the southwest (SW) of Buenos Aires Province (10,491,172 ha) was determined using the wind erosion equation (WEQ) model. WER results from multiplying the soil erodibility index (''I'') of the soil by the climatic factor (C). WER (Mg ha À1 year À1) of each municipality was:
Subsolado en simbra directa: efecto sobre parámetros físicos del suelo y el rendimiento de soja
Ciencia Del Suelo, 2014
Ciencia del suelo, 2006
Water erodibility of soils can be measured in the field using rainfall simulators or be predicted... more Water erodibility of soils can be measured in the field using rainfall simulators or be predicted with mathematical models as USLE and WEPP. The objective of our research was to determine water erodibility of three representative soils in the southern semiarid region of Argentina, aiming to a comparison with the estimated by the WEPP and USLE models. In Bahía Blanca (SBB) and Cabildo (SC) soils-Petrocalcic Paleustolls-and Villarino (SV) soil-Petrocalcic Calciustoll, two consecutive rainfalls of 32 mm during 30 minutes were applied by a rainfall simulator. Soil loss owed to first and second rain indicated: SV 3,26 and 5,86 Mg ha-1 h-1 ; SC 2,04 and 5,53 Mg ha-1 h-1 ; SBB 0,75 and 2,66 Mg ha-1. h-1 Soil resistance to water erosion correlated to silt/clay ratio (r: 0,60); OC (r: 0,55) and structural stability (r: 0,56). Average runoff and sedimentation were: SV 12,4 10-6 m s-1 and 15,6 10-5 kg s-1 m-2 ; SC 9,9 10-6 m s-1 and 13,5 10-5 kg s-1 m-2 ; SBB 9,6 10-6 m s-1 and 6,1 10-5 kg s-1 m-2. Behavior of SV soils is explained by a fast top sealing whilst SBB and SC is related to structural stability. In accord to WEPP the measured interill erodibility (Ki) was SV 2,5; SC 1,89 and SBB 1,39 (10 6 kg s m-4) whereas the estimated value was significantly higher, being SV 6,26; SC 10,2 and SBB 10,2 (10 6 kg s m-4). Erosion indexes (IE) were SV 0,30; SC 0,21 and SBB 0,10 Mg MJ-1 , highly differing from estimated K, which confirms that nomograph predicted values have low confidence in soils with a higher than 65% sand content in texture.
Strip Cropping in the Semi-Arid Region of Argentina: Control of Wind Erosion and Soil Water Accumulation
Soil Science, 2002
ABSTRACT Cultivation strips of different widths were compared in the southwestern area of the Arg... more ABSTRACT Cultivation strips of different widths were compared in the southwestern area of the Argentinean semiarid region to evaluate their efficiency in controlling wind erosion and soil water storage. The strips ranged in width from L to 4L, with L being the length of the field free of barriers, as calculated by the wind erosion equation (WEQ). The movement of soil particles and the moisture level in the soil profile were determined during three erosive events for a high susceptibility soil condition (fallow: flat and bare surface). Weeping lovegrass (Eragrostis curvula) was used as the barrier crop. Strips of L width showed the least soil movement and the highest soil water content. The amount of soil blown away increased and the level of soil moisture diminished with increasing strip width. Between L and 4L, the amount of soil captured can be explained as a function of the downwind distance from the shelter barrier (r2 = 0.88 to 0.95, p < 0.001). A similar relationship was observed between soil water content and strip width (r2 = 0.34 to 0.78, p < 0.05).
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Papers by Juan Carlos Silenzi