acid soil
61humic acid — a brown, melanin tinted mixture of polymers, found in lignite, peat, and soils, where it acts as a cation exchange agent: used in drilling fluids and inks. [1835 45] * * * ▪ chemistry one of two classes of natural acidic organic polymer… …
62podzolic soil — ▪ pedology podzolic also spelled Podsolic, also called Lessivé Soil, soil usually forming in a broadleaf forest and characterized by moderate leaching, which produces an accumulation of clay and, to some degree, iron that have been… …
63Saltpeter acid — Saltpeter Salt pe ter, Saltpetre Salt pe tre,, n. [F. salp[^e]tre, NL. sal petrae, literally, rock salt, or stone salt; so called because it exudes from rocks or walls. See {Salt}, and {Petrify}.] (Chem.) Potassium nitrate; niter; a white… …
64fulvic acid — ▪ chemical compound one of two classes of natural acidic organic polymer that can be extracted from humus found in soil, sediment, or aquatic environments. Its name derives from Latin fulvus, indicating its yellow colour. This organic… …
65brown podzolic soil — noun : any of a group of acid zonal soils developed in temperature or cool temperate humid regions under deciduous or mixed deciduous and coniferous forest and characterized by dark brown humus mineral soil covered with a thin mat of partly… …
66peat soil — noun : a soil consisting largley of peat and consequently rich in humus and of acid reaction …
67nitrohumic acid — noun Any of a range of compounds obtained by the nitration of coal, sometimes used as soil conditioners or in ion exchange …
68reddish prairie soil — noun : any of a group of zonal soils developed under tall grass in a warm temperate humid to subhumid climate that have dark reddish brown somewhat acid surface soils which grade to the parent material through slightly heavier reddish soils …
69Pachypodium habitats — consist of isolated, specialized, micro environmental niches, generally xeric, rocky, frost free areas within parts of western Madagascar and southern Africa. Pachypodium species are often indifferent to the regional ecological, biotic zone of… …
70gardening — /gahrd ning/, n. 1. the act of cultivating or tending a garden. 2. the work or art of a gardener. [1570 80; GARDEN + ING1] * * * Laying out and tending of a garden. Though palatial gardens existed in ancient times, small home gardens became… …
