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MOTOR VEHICLES CONTAMINATE ROADSIDE SOILS AND VEGETATION WITH FOUR HEAVY METAL ATMOSPHERIC POLLUTANTS. THE CONTAMINATION HAS BEEN CORRELATED WITH COMPOSITION OF GASOLINE, MOTOR OIL, AND CAR TIRES.… Continue Reading
sential mineral elements. Agreement does not always exist, however, as to whether a specific type of leaf-symptom pattern is related to total content of the deficient element or only to a specific… Continue Reading
Cadmium occurs in air and water as the result of a number of identifiable processes and practices, mainly industrial and agricultural. The metal reaches soil and plant cover directly or indirectly as… Continue Reading
Very little is known concerning the com parative mineral composition of citrus foliage, especially trace element composition, in the several producing regions of the United States. The incomplete… Continue Reading
Studies were made on the responses to differential supplies of copper, zinc, manganese, and iron shown by sweet orange and mandarin seedlings grown in vermiculite and solution cultures with the pH… Continue Reading
Rootstocks have been shown (7, 8, 9, 11, 13) to exert an influence on tree growth, disease resistance, and fruit quality factors of various types of citrus. Recent work in California (5, 6) in which… Continue Reading