EFFECT OF DIFFERENT RATES OF (N, P, K) FERTILIZERS ON BEMISIA TABACI (GENN.) INFESTATION ON TOMATO AND ITS EFFECT ON THE YIELD

Document Type : Original Article

Author

Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt

Abstract

The relation between the major plant nutrients, NPK and their combinations on tomato infestation with B.tabaci (Genn.), was studied in Imbaba district, Giza Governorate during 1995-1996. An obvious in­crease of this pest accompanied by decreasing in tomato yield was ob­served on the plants treated with high levels of N. (ammonium sulphate, 21% N). On the other hand, the study proved that the moderate level of N (1 50 unit) corresponding with potassium sulfate [Potasium sulfate, 60 units/K20)] and superphosphate (60 unit/P202) - in mixtures-gave low population of B.tabaci and higher level in yield.