Critical soil bulk density for soybean growth in Oxisols

Abstract

The aim of this study was to evaluate the critical soil bulk density from the soil penetration resistance measurements for soybean root growth in Brazilian Amazon Oxisols. The experiment was carried out in a greenhouse using disturbed soil samples collected from the northwest of Para characterized by different texture. The treatments consisted of a range of soil bulk densities for each soil textural class. Three pots were used for soybean growth of and two for the soil penetration resistance curve. From the fitted model, the critical soil bulk density was determined considering the penetration resistance values of 2 and 3 MPa. After sixty days, plants were cut and root length, dry mass of root, and dry mass of shoots were determined. At higher bulk densities, the increase in soil water content decreased the penetration resistance, allowing unrestricted growth of soybean roots. Regardless of soil texture, the penetration resistance of 2 and 3 MPa had a slight effect on root growth in soil moisture at field capacity and a reduction of 50% in the soybean root growth was achieved at critical soil bulk density of 1.82, 1.75, 1.51, and 1.45 Mg m-3 for the sandy loam, sandy clay loam, clayey, and very clayey soil.

The Reciprocal Effect Between Soil Water Content and The Soil Bulk Density on The Growth and Yield Of Onion (Allium cepa L.)

“…directly affected the addition of soil water content in soil and affect the soil bulk density becomes lower with a correlation coefficient of 0.99 (Figure 2). So, the correlation between SWC and SBD has a negative correlation, as stated by Hillel ( 2004) and (Korenkova and Urik, 2017).Previous researches by Kormanek et al (2015) and Sato et al (2015) confirmed that decreasing tendency for root system length with an increase in the level of SBD by the slope of trends line of regression equation in forest tree and soybean plant with correlation coefficient in both cases appear to be significance level.…”

“…Sato et al (2015) use the concept of soil penetration resistance (PR), found that the relationship between soil water content and soil bulk is non-linear in soybean plants. The model…”

Changes in Physical and Water Retention Properties of Technosols by Agricultural Reclamation with Wheat–Rapeseed Rotation in a Post-Mining Area of Central Poland

“…Spoil material such as glacial till is highly prone to compaction [59] and even deep soil loosening during cultivation is very quickly invisible [46]. A high BD (close to 2.0 Mg m −3 ) found in Cd horizons was limiting for plant root development [60][61][62], at the same time indicating the achievement of maximum values for till [63,64]. In the case of particle density (PD), the 43-year development of Technosols under agricultural reclamation resulted in marked profile variation that was not observed in 1978.…”