استخدام الراتنجات واولسن في دراسة جاهزية الفسفور لمحصول الذرة الصفراء في تربة كلسية من شمال العراق

الملخص EN

This study conducted at the field of the department of soil and water sciences / College of Agriculture and Forestry / Mosul University to study the effect of surface and sub-surface (15cm), soil using of nitrogen fertilizers Urea and Sheep manure and both in the presence and absence of sulphur on the available and P uptake by corn plants (Zea mays L.) .

Urea and Sheep manure each alone or mixed with each at equal rate ( 80 kg N.D-1) and two levels of sulphur (Zero and 2.5 Ton D-1) before seeds corn (Zea mays v.106) planting which was done at Spring (April 1st) 2004.

Available P was determind weekly, lasted for seven weeks, started from the 7th day of germination.

The results indicated that addtion of both fertilizers (Urea and Sheep manure) with sulfure significantly dominated over other treatments in the available and P uptake in both methods of application in all stages.

Also available and uptake P significantly increased with time of fertilizers soil contact both methods of application.

The sub-surface of urea and sheep manure with sulphur in the 7th week gave the highest amounte of available and uptake P.