تأثير موعد إضافة الأسمدة الكيميائية على محتوى وريقات النخيل من العناصر الكبرى و الحاصل لثلاث أصناف لنخيل التمر الحديثة الإثمار

الملخص EN

An experiment was conducted during 2014 growing season at Al –Rabi date palm station/Zafaraniah /Baghdad to study the effect of chemical fertilization time on NPK pannaes contents, offsets number and yield of new date palm breading for Barhee, Zahdee and Kathrawee Mandly cultivars .

There are five chemical fertilization times first time (march and September) second time (march, April and September) third time (march, April ,May and September) forth time(march, April ,May, June and September) and the last time in September , an experiment was growing under drip irrigation.

The results show that a significant increases in nitrogen and phousphors pannas contents in September , it were 1.33 , 0.226 mg.kg-1 dry mater for nitrogen and phousphors respectly ,the highest value of nitrogen pannas content had record in Zahdee cultivar it was 1.36 mg N.kg-1 dry mater , the highest value of nitrogen pannas content had record in Kathrawee Mandly cultivar fertilized in September it was 0.247 mgP.kg-1 dry mater .

There were a significant increases in potassium pannas content in forth time , it were 1.262 mgK.kg-1 dry mater ,the highest value of potassium pannas content had record in Zahdee cultivar fertilized in forth time it was 1.20 mg K.kg-1 dry mater, although results show a significant increase in yield in second time , it was 13.78 kg.tree-1 , the highest value of yield had record in Kathrawee Mandly cultivar it was 13.85 kg.tree-1 , the highest value of yield had record in Kathrawee Mandly cultivar fertilized in second time it was 15.67 kg.tree-1, although results show a significant increase in off sheet number in first time , it was 9.56 offsheet.tree-1 , the highest value of yield had record in Kathrawee Mandly cultivar it was 9.17 offsheet.tree-1 , the highest value of yield had record in Kathrawee Mandly cultivar fertilized in first time it was 14.33 offsheet.tree-1.