استجابة بعض صفات النمو الخضري للذرة الصفراء (Zea mays L.)‎ لتجزئة النتروجين المضاف و إزالة ورقة العلم و الورقة تحت العرنوص

الملخص EN

The current Study was carried out in order to investigate the impact of split application of nitrogen fertilizer, flag leaf and leaf under ear removal on growth traits in corn (Zea mays L.).

The study included a field experiment in two locations for the autumn season 2014.

The first location was in Mosul city, while the second location was in Al-Namrood which is located at 30 Km southern from Mosul.

The split plot arrangement in Randomized Complete Block Design (R.C.B.D) with three replications.

The split application of nitrogen fertilizer treatment, flag leaf and leaf under ear removal treatment represented as main plots and sub plots respectively.The first factor included five of the split application of nitrogen fertilizer treatments which is: half of recommended level was added at sowing and the other half after 30 days from sowing, one third of recommended level was added at sowing, one third after 30 days from sowing and one third after 60 days from sowing, one fourth of recommended level was added at sowing, half after 30 days from sowing and one fourth after 60 days from sowing, half of recommended level was added at sowing, one fourth after 30 days from sowing and one fourth after 60 days from sowing, one fourth of recommended level was added at sowing, one fourth after 30 days from sowing and one half after 60 days from sowing.

Four levels of flag leaf and leaf under ear removal treatment which is: no flag leaf and leaf under ear removal, flag leaf removal, leaf under ear removal, removing flag leaf and leaf under ear.

Result showed that achieved the split application of nitrogen fertilizer first treatment lower rate significantly to number of days from planting to 75% flowering male and female, and achieved first treatment higher rate significantly to other all vegetative growth traits, in two locations.

But the split application of nitrogen fertilizer, third treatment higher rate significantly to biological yield in Al-Namrood location.

Removing flag leaf and leaf under ear treatment was giving a significant increase in NAR g/m2/day, in two locations.

Achieved flag leaf removal treatment, removing flag leaf and leaf under ear treatment lower rate significantly to Leaf area duration (LAD), crop growth rate (CGR) g/m2/d and biological yield (ton/ha) in two locations.

Interaction between split application of nitrogen fertilizer treatment and flag leaf and leaf under ear removal treatment was not significant in the two locations