Structural quality of a no-tillage red latosol 50 months after gypsum aplication

Abstract

Gypsum application may enhance the soil quality for plants in terms of soil chemical and physical properties. The objective of this study was to evaluate the effects of gypsum application on the structural quality of a no-tillage Red Latosol. The experiment was initiated in September 2005 in Guarapuava-PR, with gypsum applications of 0; 4; 8; and 12 Mg ha-1 on the soil surface. In November 2009, two soil blocks were sampled from the 0-0.3 m layer for visual evaluation of the soil structure quality (Sq) and to determine the aggregate-tensile strength (ATS). Soil penetration resistance (PR) and gravimetric moisture (H%) of the 0-0.300 m layer were evaluated, and soil cores were collected (layers 0.000-0.075 and 0.075-0.150 m), to determine soil bulk density (BD), total soil porosity (TP), microporosity (Mi), and macroporosity (Ma). Data were subjected to analysis of regression at 5 %. No significant effects of gypsum application on ATS and H % of aggregates were observed, but for Sq, a quadratic effect (0.000-0.075 m) and linear increase (0.075-0.150 and 0.150-0.300 m) were stated, indicating soil quality decrease, although Sq remained mostly below 3.0, with good to intermediate soil quality. Soil PR increased with gypsum, but also remained below critical levels. No effect was observed for soil H % at the moment of PR determination on the field. The gypsum applications decreased BD in the 0.075-0.150 m layer, and increased PT and Ma, while in 0.000-0.075 m some Ma was converted to Mi, without affecting PT and BD. These last results indicate a gain in soil structural quality by gypsum applications, but the higher scores of soil structure and values of soil penetration resistance, though still below thresholds, should be monitored to prevent limitations to soil use in the future.

Sustainable effects of gypsum from desulphurization of flue gas on the reclamation of sodic soil after 17 years

“…In addition, the proportions of aggregates increased with increasing soil depth, indicating that the effects of FGD gypsum on aggregation increased in the deeper soil layers after 17 years, even though gypsum was applied to the upper 20‐cm soil layer only. This result is consistent with that of Müller et al (), who reported that aggregate formation increased in lower layers 50 months after gypsum application in a no‐till field experiment. This result can be explained by the downward movement of Ca 2+ released from the FGD gypsum with sufficient leaching (Yu et al, ) over time.…”

Sulfate-Based Fertilizers Regulate Nutrient Uptake, Photosynthetic Gas Exchange, and Enzymatic Antioxidants to Increase Sunflower Growth and Yield Under Drought Stress

“…Moreover, gypsum stabilizes soil structure by increasing flocculation in the soil, enhances cation exchange capacity, and improves soil infiltration rate (Chibowski et al 2014). Müller et al (2012) showed that soil amendment with gypsum promotes the vertical mobility and hydraulic gradient of the soil profile, consequently increasing water and nutrient uptake in plants.…”

Efeito Residual Da Gessagem E Calagem Na Resistência À Penetração Obtida Com Dois Penetrômetros

“…(Chapadão do Sul, MS, 2015). O mesmo resultado não foi obtido por Müller et al (2012), cujo estudo versou sobre os efeitos de doses de gesso aplicados na superfície sobre a qualidade estrutural do solo de um Latossolo Vermelho após 50 meses de aplicação em sistema de semeadura direta. Os autores obtiveram diferença para resistência à penetração (RP) nas camadas 0,075-0,30 m de profundidade, justificando esta diferença pelo aumento de agregados em consequência do aumento de teor Ca na subsuperfície o que aumenta a força de agregação das partículas, porém estes valores não foram suficientes para restringirem o crescimento radicular.…”