EFFECT OF ADDITION DATE OF PHOSPHORUS, ZINC, ZINC SOURCE AND BIO-INOCULATION ON THE GROWTH OF MAIZE (ZEA MAYS L.)

Abstract

Pots experiment was carried out at the Department of Soil and Water Resources at the College of Agriculture in the University of Anbar, Iraq during 2017 season to investigate the comparison of phosphorus, zinc and zinc source addition with and without bio-inoculation and its impact on the maize (Zea mays L.) growth. Treatments included the addition of mineral zinc and phosphorus at cultivation (Zn+P), the addition of mineral zinc at cultivation with phosphorus after 30 days of cultivation (Zn+P30), the addition of mineral zinc after 30 days of cultivation Zn30 and the addition of phosphorus at cultivation (Zn30+P), the same previous treatments were added using the source of chelating zinc ZnDTPA instead of mineral zinc as ZnD+P30, ZnD30 + P and ZnD+P. These aforementioned treatments were added with and without the bio-inoculation. The net number of treatments were 12 distributed according to the Complete randomized design (CRD) with three replications. Results showed the superiority of addition of mineral and chelating zinc after 30 days of cultivation (Zn30+P and ZnD30+P) and the addition of phosphorus at cultivation with inoculation and without it (ZnD+P) in the lengths of the shoot and root total weight, zinc concentration and content in the vegetation and root yield, the concentration of phosphorus and zinc in the soil, as well as the treatment of the addition of mineral and chelating zinc at cultivation and phosphorus after 30 days of cultivation with inoculation and without it in the absorption of phosphorus.