Effect of silicate fertilization on soil and on palisade grass plants under grazing intensities

Abstract

-Application of calcium silicate (SiCa) as soil acidity corrective was evaluated in a Rhodic Hapludox soil with palisade grass conducted under pasture rotation system with different grazing intensities. Experimental design was complete randomized blocks with four grazing intensities -grazing intensities were imposed by forage supply (50, 100, 150 and 200 kg t -1 of DM per LW) -in experimental plots with four replicates and, in the subplots, with seven doses of calcium silicate combined with lime: 0+0, 2+0, 4+0, 6+0, 2+4, 4+2 and 0+6 t ha -1 , respectively. In the soil, it was evaluated the effect of four levels of calcium silicate (0, 2, 4 and 6 t ha -1 ) at 45, 90, and 365 days at three depths (0-10, 10-20 and 20-40 cm) and at 365 days, it was included one level of lime (6 t ha -1 ). For determination of leaf chemical composition and silicate content in the soil, four levels of calcium silicate (0, 2, 4 and 6 t ha -1 ) were evaluated at 45 and 365 days and at 45 days only for leaf silicate, whereas for dry matter production, all corrective treatments applied were evaluated in evaluation seasons. Application of calcium silicate was positive for soil chemical traits related to acidity correction (pH(CaCl 2 ), Ca, Mg, K, H+Al and V), but the limestone promoted better results at 365 days. Leaf mineral contents were not influenced by application of calcium silicate, but there was an increase on silicate contents in leaves and in the soil. Dry matter yield and chemical composition of palisade grass improved with the application of correctives.

Use of Silicate Minerals for pH Control during Reductive Dechlorination of Chloroethenes in Batch Cultures of Different Microbial Consortia

“…Their dissolution is triggered by acidity production, and the risk of pH overshooting is prevented (31). Wollastonite (CaSiO 3 ) powder, a fast-dissolving calcium silicate, is commonly used in agronomy as a liming agent (32,33), but the utilization of silicates for remediation of contaminated water bodies and groundwater has rarely been investigated. The addition of wollastonite to an anthropogenically acidified stream was found to be highly effective in increasing the pH and the acid-neutralizing capacity of stream water (34,35).…”

Investigations on the Thermodynamic Stability and Availability of Nutrients for Plants by Humic Substances Extracted from Peat Samples

“…Moreover, López et al [35] showed that the formation of metal-organic complexes leads to an increase in acidity of soil solution. Nonetheless, acidification can be easily controlled using lime, and silicon has also been shown to provide effective support for the plant [36]. Furthermore, any drawbacks could be compensated by the ability to use a single product containing the micronutrients that are most important to plants as…”