Abstract:O intervalo hídrico ótimo (IHO) é um indicador de qualidade física do solo para o crescimento de plantas determinado não só pela disponibilidade de água, mas também pela aeração e resistência que o solo oferece à penetração das raízes. O objetivo do trabalho foi avaliar a eficiência da revegetação com as leguminosas arbóreas Acácia, Sábia e Ingá, para a recuperação da qualidade física de um Argissolo Vermelho-Amarelo inicialmente sob pastagem degradada, utilizando como indicador o intervalo hídrico ótimo e as … Show more
“…Resistance to penetration is related to soil moisture, directly influencing the development of crop root systems. As moisture contents decrease in the soil, its mechanical strength increases, thus impairing root growth (FAUSTINO; MARCIANO, 2021).…”
The objective of this study was to monitor the temporal variation in penetration resistance (PR) after soil saturation under diff erent management systems in three areas of the Cerrado biome: two in no-till systems (NT with 3 and 10 years of implementation) and one of crop-livestock integration (CL with 9 years of implementation) with soybean/forage succession. Four transects were delimited in each area. The delimited area was saturated and the PR measurements were performed daily for 11 days at 10 transect points, up to 0.40 m of depth. Soil moisture was determined with PR measurements, soil hydraulic conductivity, and organic carbon. PR values were more signifi cant in the 0.10 -0.20 m layer than in the 0.0 -0.10 and 0.20 -0.40 m layers. The NT-3 area showed a lower PR value (1.65 MPa) than the area under NT-10 and CL-9, with 2.48 and 2.69 MPa, respectively. Thus, critical soil moisture values, that is, soil moisture values most susceptible to soil compaction were determined. Thus, in the NT-3 area, the critical moisture was 0.20 kg kg -1 , in the NT-10, ranged from 0.19 -0.20 kg kg -1 , and in the CL-9, between 0.23 and 0.20 kg kg -1 . Monitoring soil moisture can prevent management operations from restricting root growth.
“…Resistance to penetration is related to soil moisture, directly influencing the development of crop root systems. As moisture contents decrease in the soil, its mechanical strength increases, thus impairing root growth (FAUSTINO; MARCIANO, 2021).…”
The objective of this study was to monitor the temporal variation in penetration resistance (PR) after soil saturation under diff erent management systems in three areas of the Cerrado biome: two in no-till systems (NT with 3 and 10 years of implementation) and one of crop-livestock integration (CL with 9 years of implementation) with soybean/forage succession. Four transects were delimited in each area. The delimited area was saturated and the PR measurements were performed daily for 11 days at 10 transect points, up to 0.40 m of depth. Soil moisture was determined with PR measurements, soil hydraulic conductivity, and organic carbon. PR values were more signifi cant in the 0.10 -0.20 m layer than in the 0.0 -0.10 and 0.20 -0.40 m layers. The NT-3 area showed a lower PR value (1.65 MPa) than the area under NT-10 and CL-9, with 2.48 and 2.69 MPa, respectively. Thus, critical soil moisture values, that is, soil moisture values most susceptible to soil compaction were determined. Thus, in the NT-3 area, the critical moisture was 0.20 kg kg -1 , in the NT-10, ranged from 0.19 -0.20 kg kg -1 , and in the CL-9, between 0.23 and 0.20 kg kg -1 . Monitoring soil moisture can prevent management operations from restricting root growth.
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