Page 189 - Ilmu Tanah

176 The Chemistry and Fertility of Soils under Tropical Weeds

Chelate A chemical species of any element formed between any cation with
organic multi-functional groups. One example of chelates is Fe-EDTA in which
2+
a divalent cation Fe is associated with organic multi-ligand EDTA.

Chemical Weed Control The method to control weeds by using organic or inorganic
lethal chemical substances.

Coffee Plantation Land-use system for commercial coffee plants

Complexation The association of one elemental species with another elemental
+
-
+
species with different charges such as Cu(OH) , Pb(H 2 PO 4 ) , or Al(OH) 4 .
Complex Ion An ionic species formed by the association on one elemental species
+
with another elemental species with different charges such as Cu(OH) ,
+ -
Pb(H 2 PO 4 ) , or Al(OH) 4 .

Cultivated Land Land-use system for intensively planted crops like paddy, corn,
and/or vegetables.

Culture Technique Weed Control Weed control conducted by availing an optimum
growing environment for the crop plants, which is not suitable for weeds so
that the growth of weeds is inhibited (Sriyani, 2010).

Decomplexation A chemical process in which a complex ion release its cations
+
driven by low concentration of the participating species. For example, Zn(OH)
2+ -
becomes Zn and OH .
Decomposition A chemical process by which the organic and structurally bound
elements not available to plants are detached to be inorganic elements
available to plants. For example, the decomposition of organic P to form
inorganic P (orthophosphates) available for plant root absorption.

Deforestation The transformation of forest from the primary forest to secondary
forest, plantation, and intensively cultivated lands or other uses by human
being.

Desorption A chemical process by which an attached ion onto a charged solid is
detached. For example, the detachment of exchangeable Ca on soil solids to
2+
form Ca in soil solution.

Abdul Kadir Salam and Nanik Sriyani – 2019