اثر دفعات محلول پاشي عنصر روي بر تعدادي از صفات فيزيولوژيك ذرت دانه اي (سينگل كراس 704)

Effect of Zinc Foliar Application Intervals some on physiological raits of Zea mays (Single cross 704)

To determine the effect of different intervals of zinc compounds applications on enzymes of single cross 704, a factorial experiment based on RCBD with 3 replications was carried out at the Agricultural Research Center of Varamin, southeast of Tehran, during 2007-8. Treatments were intervals of foliar applications (every 7, 14 and 21 days) and four kinds of foliar application compounds (zinc sulfate, zinc chelate, pure water and no treatment). Results of laboratory studies showed that maximum quantities of mannose and glucose were produced from second interval of foliar application, and peroxidase and chlorophyll a from both first and second foliar application intervals. Minimum quantities were produced from third interval. Maximum quantities of peroxidase and chlorophyll a were produced with zinc foliar application. Non foliar application highly affected glucose production. Interaction of foliar application with zinc sulfate at first interval had maximum effect on protein and maximum quantities of auxin-oxidase and flavonoid also resulted from foliar application with zinc at third application interval. Foliar zinc application at second interval had maximum effect on chlorophyll b. Therefore it can be concluded that zinc sulfate foliar application at first and second intervals had the maximum effects.