دراسة الفعالية الزراعية للصخر الفوسفاتي بتأثير النوع النباتي ونسب الخلط مع الكبريت

الموضوعات

زراعة

روابط وملفات

التعريف والنوع

رقم الوثيقة

fbc99ac7-22e3-47ef-b5b8-5c3d99cdedca

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1957623_1.pdf

بيانات النشر

ترجمة العنوان

Effect of plant species and mixing ratios with elemental sulfur on the agronomic effectiveness of phosphate rock

ألقاب المؤلفين

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اللغة

Arabic

المصدر والدورية

اسم المصدر

دراسة الفعالية الزراعية للصخر الفوسفاتي بتأثير النوع النباتي ونسب الخلط مع الكبريت

المحتوى والصفحات

عدد الصفحات

0

ترجمة الملخص

In order to study the effect of plant species and mixing ratios with elemental sulfur (S) on the agronomic effectiveness of Syrian phosphate rock (PR). Field trails in alkaline soil with low calcium carbonate content were carried out. In addition, tow laboratory experiments were completed: (1) agar technique in order to demonstrate the effect of rooting system of plant species on pH changes in rhizosphere area. and (2) inorganic p-fractionation method for advanced understanding of inorganic phosphorus (Pi) transformations, and the effect of phosphorus sources in phosphorus transformation and reactions with soil components, and to determine phosphorus chemical species responsible of providing available-P. Field trials were conducted for two years at Al Henadi town, located south of Latakia to evaluate the response of three plant species: Rape plant (Brassica napus L.), Chickpea (Cicer arietinum L.) and Bermuda grass (Cynodon dactylon) to phosphate rock (PR) and its mixture with three rates of elemental sulfur (10, 20, 50%), compared to triple super phosphate (TSP). Phosphate sources (TSP and PR) were applied at three rates (520, 1040, 1650 kg P/ ha soil) in addition to control which didn't receive any source of phosphorus. The results showed that rape plants were able to use applied PR in the first season irrespective of S mixing, with a relative agronomic effectiveness (RAE%) of 102%. In the second growth seas on the RAE of PR relative to TSP increased to 145%. Mixing with elemental Sulfur didn't increase dry matter production, whereas negative effect was observed at high rate application of Sulfur (50%). The high response of rape to PR application is probably due to the released organic acids from rooting system, which will certainly enhance the dissolution of PR particles. Chickpea was able to use phosphate rock when it was added alone, with a RAE of 82% compared to TSP, RAE value of PR decreased when mixed with sulfur. The ability of chickpea to use PR is due to the reduce of soil rhizosphere pH by excreted H+ions when fixing atmospheric N, through the coexistence of Rhizobium bacteria with rooting system, as well as the ability to excrete phenolic and organic acids. Bermuda grass able to use PR during the first year, with a relative agronomic effectiveness (RAE%) of 75% at the end of this year. PR showed a residual effect, this lead to plant response during the next year and 109% for RAE was achieved. RAE value increased to 126, 131, and 193% when PR mixed with elemental sulfur at 10, 20, and 50% mixing rate respectively. Response to PR mixtures with sulfur was continued during the next year .Agar technique offers a simple way to get an overall view of pH changes in the rhizosphere. The experiment showed that under phosphorus deficiency rapeseeds and chickpea reduce medium pH to 4 degree when plants grown in nutrient solution or in soil media. In contrast, Bermuda grass roots didn't show 90any changes in pH degree. This has led to delayed response of this plant, where other factors such as microbial activity due to carbohydrates excretion by plant roots contributed to phosphate rock dissolution. P fractionation procedure showed that dominant P-fractions in PR and PRS treatments were apatite (Ca10-P), and the concentration of Ca10-P in PRS treatments decreased as the ratio of sulfur to PR increased in both seasons ,the decrease being more pronounced in second season,octa-calcium phosphates (Ca8-P) was the second major fraction in PR and PRS treatments. The opposite was true in TSP treatments. Di-calcium phosphates (Ca2-P) was the main source of available soil P as it correlates significantly with Olsen-P,regardless of the source of phosphorus fertilizer (PR, TSP)

إشراف وإعداد

الإشراف

غياث علوش, ليلى حبيب

الإعداد

رباب منير ناصر

الاقتباسات الببليوغرافية