تاثير التسميد العضوي والبوتاسي في الامونيوم الجاهز ومحتوى النترات في التربة وفي نسبة البروتين في حبوب الـذرة الصفـراء (Zea mays L.)

Abstract

A field experiment was carried out at the farm of Field Crops Science Department, Agriculture College / University of Baghdad to study the effect of organic and potassium fertilizers in ammonium release, nitrate values in soil and percentage of protein in corn grain (Zea mays L.) Buhooth 106 cultivar. Split plot design arranged by RCBD was used, where the main plots included two sources of organic fertilizer (Cow and Sheep) at 25 ton.ha-1 in addition to control, while the sub plots included three levels of potassium sulphate fertilizer (0,100 and 200 kg.ha-1). The results showed that the sheep fertilizer had significant effect on available ammonium in flowering and harvest stages 8.91 and 8.82 mg.kg-1 soil, respectively, compared with cow fertilizer 7.38 and 7.76 mg.kg-1 soil, respectively, and control 6.62 and 6.96 mg.kg-1 soil respectively. No significant differences in nitrate contents between all stages of plant growth and also between percentages of protein in corn grains. Third level of potassium fertilizer significantly increased the available ammonium in flowering and harvest stages 8.50 and 8.36 mg.kg-1 soil, respectively, in compared with control treatment 6.56 and 7.24 mg.kg-1 soil, respectively. While the interaction between organic and potassium fertilizer did not reveal significant differences in each of available ammonium and nitrate content of the soil and protein in corn grain.