Pollution (abiotic) damage to agricultural vegetation in the Philippines
1994
Quebral, F.C. | Navasero, M.M. | Daquioag, V.R. | Barcial, P.M.
The visible damage to agricultural vegetation in the Philippines due to pollutants have been recorded by the Plant Pest Clinic on various crops affecting some 100 hectares. An estimated P20 million in visible damage occurs annually for Region 4 alone on the following crops: rice, guapple trees, citrus, lanzones, gabi, tomato, garlic, coconut, corn, etc. Other effects of economic significance on plants include: suppression of growth, early leaf drop, delayed maturity, abortion of blossoms, reduced yield and quality. The extent of damage and where pollution occurs are governed by the kind of concentration of pollutant, length of time exposed, meteorological factors (i.e. wind direction, temperature, humidity), land contours, soil temperature and moisture, physiological age of plant tissues, plant species and varieties grown. In general, the visible injury to plant leaves is of three types: 1) collapse of leaf tissues, 2) chlorosis or other color change and 3) growth alterations. The pollutants recorded by the Pest Clinic in the last five years are as follows: cement, brine, sulfur, ammonia, pesticides, fertilizers, factory wastes
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