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Study of the Relative Agronomic Effectiveness of a Syrian Phosphate Rock, and the Effect of Mixing with Different Ratios of Elemental Sulfur

دراسة الفعالية الزراعية النسبية لصخر فوسفاتي سوري و تأثرها بنسب الخلط بعنصر الكبريت

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 Publication date 2009
and research's language is العربية
 Created by Shamra Editor




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A pot experiment was conducted to evaluate the relative agronomic effectiveness (RAE%) of a Syrian phosphate rock when it is added alone and as mixture with elemental sulfur with three different ratios (PR:S) (2:1) (5:1) (8:1) and compared with triple superphosphate. The main results of this study showed that Ain Layloun phosphate rock was not effective for direct use by Rye grass when used alone, but it became effective when mixed with elemental sulfur. The relative agronomic effectiveness was varied following mixing ratios, it was 50%, 76% and 87% in (8:1), (5:1) and (2:1) (PR:S) mixing ratios respectively. This is due to the increase of available soil phosphorus content which is related to the increase of phosphate rock solubility due to decrease of pH derived from oxidation of sulfur by Thiobacillus spp.

References used
Attoe, O. J. and R. H. Olsen. 1966. Factors affecting rate of oxidation of sulphur and that added in rock phosphate-sulphur fusions. Soil Sci. Vol. 101, 317-324
Bolan, N. S and M. J. Hedley. 1990. Dissolution of phosphate rocks in soils. 2. Effect of pH on the dissolution and plant availability of phosphate rock in soil with pH depending charge. Fert. Res. Vol24., 125- 134
Chien, S. H; and D. K. Friesen. 1992. Phosphate rock for direct application. In F. J. Sikora, ed. Future directions for agricultural phosphorus research, 47- 52

Artificial intelligence review:
Research summary
تجربة زراعة في أواني أجريت لتقييم الفعالية الزراعية النسبية لصخور الفوسفات السورية عند إضافتها بمفردها وعند خلطها مع الكبريت العنصري بنسب مختلفة (PR:S) (2:1) (5:1) (8:1) ومقارنتها مع السوبر فوسفات الثلاثي. أظهرت النتائج الرئيسية لهذه الدراسة أن صخور الفوسفات من عين ليليون لم تكن فعالة للاستخدام المباشر من قبل نبات العشب الجاودار عند استخدامها بمفردها، لكنها أصبحت فعالة عند خلطها مع الكبريت العنصري. اختلفت الفعالية الزراعية النسبية حسب نسب الخلط، حيث كانت 50%، 76%، و87% في نسب الخلط (8:1)، (5:1)، و(2:1) (PR:S) على التوالي. يعود ذلك إلى زيادة محتوى الفوسفور المتاح في التربة والذي يرتبط بزيادة ذوبانية صخور الفوسفات نتيجة لانخفاض درجة الحموضة الناتجة عن أكسدة الكبريت بواسطة بكتيريا Thiobacillus spp.
Critical review
دراسة نقدية: تقدم هذه الدراسة رؤى قيمة حول فعالية صخور الفوسفات السورية عند خلطها مع الكبريت العنصري، مما يساهم في تحسين استخدام الموارد الطبيعية المحلية. ومع ذلك، يمكن توسيع الدراسة لتشمل أنواع أخرى من النباتات والتربة المختلفة لتأكيد النتائج وتوسيع نطاق التطبيق. كما أن الدراسة تفتقر إلى تحليل اقتصادي يوضح الجدوى الاقتصادية لاستخدام هذه الخلطات مقارنة بالأسمدة التقليدية. بالإضافة إلى ذلك، يمكن أن تكون هناك حاجة لمزيد من الدراسات حول التأثيرات البيئية لاستخدام الكبريت العنصري بكميات كبيرة.
Questions related to the research
  1. ما هي النسب المختلفة المستخدمة في خلط صخور الفوسفات مع الكبريت العنصري في الدراسة؟

    النسب المستخدمة هي (2:1)، (5:1)، و(8:1) (PR:S).

  2. ما هي الفعالية الزراعية النسبية لصخور الفوسفات عند خلطها مع الكبريت بنسبة (2:1)؟

    الفعالية الزراعية النسبية كانت 87% عند خلط صخور الفوسفات مع الكبريت بنسبة (2:1).

  3. لماذا أصبحت صخور الفوسفات أكثر فعالية عند خلطها مع الكبريت العنصري؟

    أصبحت أكثر فعالية بسبب زيادة ذوبانية صخور الفوسفات الناتجة عن انخفاض درجة الحموضة بسبب أكسدة الكبريت بواسطة بكتيريا Thiobacillus spp.

  4. ما هي الأسمدة التي تم استخدامها للمقارنة مع خلطات صخور الفوسفات والكبريت في الدراسة؟

    تم استخدام السوبر فوسفات الثلاثي (TSP) للمقارنة مع خلطات صخور الفوسفات والكبريت.

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