Soil Conditions and Plant Growth

Mobilização do solo, erosão e produtividade de milho e feijão em um regossolo no agreste pernambucano

“…Isso parece indicar que a maior taxa de absorção de nutrientes ocorre nessa profundidade, já que os primeiros centímetros constituem-se na camada de solo mais estressante, quando o solo está descoberto (Russell, 1973;Medeiros, 1977;Resende, 1983). A evaporação na região em estudo proporciona perda muito elevada de água dos primeiros centí-metros, e nos solos arenosos, nos quais predomina areia grossa, a água disponível encontra-se na subsuperfície.…”

Assessing the Soil Nutrients of the Akanu Ibiam Federal Polytechnic Unwana, Nigeria

“…It can also be used to modify the activity of various enzymes by phosphorylation. Since ATP can be used for the biosynthesis of many plant biomolecules, phosphorus is important for plant growth and flower/seed formation [2,6] Iron had a noticeable elevated level occurring in all the samples which were even higher than the required concentration in the soil (90mg/kg). Iron belongs to the group of elements whose minimal dose is indispensable for the proper functioning of organisms and excessive amounts exert detrimental effects [15].…”

“…Soil predominantly contains particles initially derived from the disintegration or decomposition of primary igneous rocks. But these particles may have been produced at an earlier geological period, moved by wind, water or ice over considerable distances and been through one or more cycles of erosion and decomposition [2]. Soil consists of four parts: mineral matter derived from the rocks, calcium carbonate and residual organic compound, residues of plants and microorganisms recently added to the soil and the soil water.…”

A multisyringe flow-through sequential extraction system for on-line monitoring of orthophosphate in soils and sediments

“…In fact, the most commonly accepted schemes for soil organic phosphorus fractionation [43,44] involve alkaline and acid extractions with 0.1-0.5 M NaOH and > 0.1 M HCl, respectively, thus matching the chemical conditions for HL and SMT extractions. NaOH creates electrostatic repulsions by increasing the negative charge of both organic and mineral components [45] while HCl dissolves salts of some organic phosphate esters that are relatively insoluble in alkaline solution [43].…”