دور بعض العوامل الفيزيائية للتربة والتسميد الفوسفاتي في إنتاجية الذرة الصفراء ونموها في سهل الغاب
Abstract
أجريت التجربة في أصص تحت الظروف الطبيعية لمعرفة تأثير مستويات رطوبة مختلفة
(60، 70، 100 %) من السعة الحقلية والقوام (طينية، لومية، رملية) وتحت مستويات من السماد الفوسفاتي
(0/50/75/100 كغ P2O5 / هـ) في نمو الفسفور وامتصاصه من قبل نبات الذرة الصفراء.
بينت النتائج أن التربة الرملية أعطت أعلى قيمة للوزن الجاف والفسفور الممتص في الجزء الخضري والجذور تحت تأثير المستوى الرطوبي 100 % والإضافة السمادية 100 كغ P2O5 / هـ. أما التربة اللومية ذات المستوى الرطوبي 100 % وتحت الإضافة السمادية الفوسفاتية 100 كغ P2O5 / هـ أعطت أعلى قيمة للوزن الجاف للجزء الخضري والجذور والفسفور الممتص، بينما أعطت التربة الطينية قيماً مرتفعة للوزن الجاف للجزء الخضري تحت تأثير المستوى الرطوبي 70 % مع 75 كغ P2O5 / هـ سماد فوسفاتي.
عموماً فإن القوام اللومي أعطى أعلى وزن جاف وفسفور ممتص تحت تأثير رطوبة 100 % وإضافة سمادية 100 كغ P2O5 / هـ مقارنة بالقوام الطيني و القوام الرملي.
A pot experiment was conducted under natural conditions to determine the effect of different moisture levels (60, 70, 100%) of the field capacity, texture (clay, loam, sand), and under different levels of phosphorus fertilizer (0, 50, 75, 100 kg P2O5 / ha) on growth and P-uptake by Zea Mays. The results showed that the sandy soils gave the highest dry weight and P-uptake value to the green part and roots under moisture level 100% and under the addition of phosphorus fertilizer 100 kg P2O5 /ha. The loam soil of 100 % moisture level and under the phosphorus fertilizer addition 100 kg P2O5 /ha gave the highest value to the dry weight of the green part, roots and P-uptake. Whereas clay soil gave the highest value to dry weight of the green part under the effect of 70% moisture levels with 75 kg P2O5 /ha phosphorus fertilizer. Generally, the loam texture gave a higher dry weight and P-uptake under 100 % moisture and fertilizer addition 100 kg P2O5 / ha compared with the clay and sand texture.
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