humus


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humus

(hyo͞o`məs), organic matter that has decayed to a relatively stable, amorphous state. It is an important biological constituent of fertile soilsoil,
surface layer of the earth, composed of fine rock material disintegrated by geological processes; and humus, the organic remains of decomposed vegetation. In agriculture, soil is the medium that supports crop plants, both physically and biologically.
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. Humus is formed by the decomposing action of soil microorganisms (e.g., bacteria and fungi), which break down animal and vegetable material into elements that can be used by growing plants. Technically, humus, as the end result of this process, is less valuable for plant growth than are the products formed during active decomposition (see fertilizerfertilizer,
organic or inorganic material containing one or more of the nutrients—mainly nitrogen, phosphorus, and potassium, and other essential elements required for plant growth.
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). Because of its low specific weight and high surface area, humus has a profound effect upon the physical properties of mineral soils with regard to improved soil structure, water intake and reservoir capacity, ability to resist erosion, and the ability to hold chemical elements in a form readily accessible to plants.

Humus

 

an organic, normally dark-colored part of the soil formed as a result of biochemical transformation of plant and animal residues. Humus consists of humic acids (most important for soil fertility) and fulvic acids (crenic acids). Humus contains the main elements of plant nutrition that become available to plants as a result of microbial activity.

humus

[′hyü·məs]
(geology)
The amorphous, ordinarily dark-colored, colloidal matter in soil; a complex of the fractions of organic matter of plant, animal, and microbial origin that are most resistant to decomposition.

humus

A brown or black material formed by the partial decomposition of vegetable or animal matter; the organic portion of soil.

humus

a dark brown or black colloidal mass of partially decomposed organic matter in the soil. It improves the fertility and water retention of the soil and is therefore important for plant growth
References in periodicals archive ?
En la Tabla 1 se presenta la caracterizacion fisicoquimica obtenida del biosolido, humus y sustrato control, en los parametros anteriormente descritos; con su respectivo valor limite maximo de la NTC 5167 (ICONTEC, 2004).
The model calculates the N turnover in the soil using three interrelated N pools: the mineral N pool, the metabolisable organic N pool, and the humus N pool (inert organic N).
En el Cuadro 3 se puede apreciar la respuesta de las variables vegetativas de la morera a las concentraciones de humus liquido suministradas, observandose que el peso de las hojas, tanto fresco como seco, aumento considerablemente en funcion de la concentracion de humus aplicado, siendo estadisticamente mayor en las plantas donde se aplico concentrado al 50 %.
Chernozems of Perm Krai forest-steppe are characterized by dark colour, almost black humus horizon, that is, on average 38 cm high.
Usually loss of soil fertility is related to decrease of humus in soil.
Taking into account the dependence of automorphic soil humus horizon (A + AB) power from zonal-provincial resource of heat and moisture provision, the income of vegetable matter, time, and parent rock granulometric content, the total record of change model for automorphic soil humus horizon (H(t), mm) during the Holocene (t, years) may be represented by the following formula:
La combinacion del residual de cacao con estiercol vacuno en la alimentacion de las lombrices estimula la produccion de sustancias organicas extractables en el humus producido (Tabla IV), predominando dentro de estas sustancias los acidos organicos menos complejos (Acidos fulvicos, alrededor del 8 % del carbono total).
En este planeamiento fue considerado el volumen de VCC a ser usado en la decantacion del lodo y la variacion de las alturas de las camadas totales del suelo (CTS) en la obtencion de los humus.
Opting to leave nearly half the humus intact, we were asked by the smiling waitress if we were ready for our main dishes which were brought out a few moments later.
The large sizes of nodules in legumes planted in humus soil could be explained on the basis of high nutrient level of humus soils.
Lebanese chefs last October claimed the title in the Guinness Book of Recor= ds with a two-ton serving of humus, pronounced in Hebrew with the guttural = =93h=94 and with a long =94u.