Page 194 - Ilmu Tanah

The Chemistry and Fertility of Soils under Tropical Weeds 181

Weathering A physical or chemical or biological destruction of soil mineral
structure resulting in a new, more simple, and more stable minerals. In
chemical weathering, some inorganic elements are freed and are available to
plants. For example, during the chemical weathering of feldspars in the
+
+
presence of H ions and H 2 O molecule, K ions are freed to be available for
plants.
Weed A fast growing, competitive, destructive, and unwanted plant that disturb
human activities.

Weed Control The method to eliminate or decrease the population and
propagation of weeds in a particular land.

Weed Dominance The superiority of a particular weed over others expressed in
percent composition per square meter.

Weed Management Maximum utilization of all environmental aspects to make
sure that the negative effects of weeds on crop plants are minimum.

Abdul Kadir Salam and Nanik Sriyani – 2019