مهندسی زراعی

اثر کاربرد توأم استروویت بازیابی شده از لجن فاضلاب و سوپرفسفات تریپل بر زیست فراهمی فسفر در خاک و جذب آن در گیاه گندم

نوع مقاله : مقاله پژوهشی

نویسندگان

طالب نظری 1
مجتبی بارانی مطلق 2
سید امید رستگار 3
محمد حسین سدری 4

1 دانشجوی دکتری گروه علوم خاک، دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

2 دانشیار گروه علوم خاک، دانشکده مهندسی آب و خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان ، ایران

3 دانشیار گروه مهندسی شیمی، دانشکده مهندسی ، دانشگاه کردستان

4 دانشیار بخش تحقیقات خاک و آب مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کردستان، سازمان تحقیقات، آموزش و ترویج کشاورزی، سنندج، ایران

https://doi.org/10.22055/agen.2024.45841.1711
چکیده
بازیابی فسفر به‌عنوان استروویت (فسفات آمونیوم منیزیم) از تصفیه خانه‌های فاضلاب به‌دلیل پتانسیل استفاده مجدد به‌عنوان کود فسفره توجه پژوهش‌گران را به خود جلب کرده است. لذا هدف از این پژوهش بررسی اثر استروویت جایگزین شده با کود سوپر فسفات تریپل بر زیست فراهمی فسفر در گیاه گندم بود. بدین منظور آزمایشی فاکتوریل در قالب طرح کاملاً تصادفی در 3 تکرار به‌صورت گلدانی به اجرا درآمد. فاکتورها شامل کاربرد نسبت‌های مختلف کود استروویت جایگزین شده با سوپر فسفات تریپل در شش سطح (S0:P0، S0:P100، S25:P75، S50:P50، S75:P25 و S100:P0) و سه سطح فسفر (50، 100 و 150 کیلو-گرم سوپر فسفات در هکتار) و در مجموع 54 گلدان بود. میزان کاربرد استروویت بر اساس مقدار فسفر کل (P2O5) سوپر فسفات تریپل محاسبه شد. بر پایه نتایج بدست آمده تمامی تیمارهای مورد بررسی و اثر متقابل آنها در سطح احتمال یک درصد (p < 0.01) معنی‌دار شد. مقایسه میانگین‌‌های اثر تیمارهای مختلف استروویت نشان داد با جایگزین کردن استروویت به جای کود سوپر فسفات تریپل در هر سه سطوح کودی، بیش‌ترین وزن تازه اندام هوایی (با میانگین 79/7 گرم درگلدان)، وزن خشک اندام هوایی (با میانگین 13/1 گرم درگلدان) غلظت نیتروژن اندام هوایی (با میانگین 82/4 درصد) و جذب آن (با میانگین 44/5 گرم درگلدان) از کاربرد تیمار S75:P25 150 کیلوگرم کود سوپر فسفات در هکتار بدست آمد. همچنین نتایج نشان داد بیش‌ترین مقدار غلظت و جذب فسفر به‌ترتیب با میانگین 174/0 درصد و 197/0 گرم در گلدان از کاربرد تیمار S75:P25 150 کیلوگرم کود سوپر فسفات در هکتار بدست آمد که نسبت به کاربرد تیمار S75:P25 50 و 100 کیلوگرم سوپر فسفات در هکتار به‌ترتیب افزایشی معادل با 43/26، 89/59، 49/11 و 14/43 درصد داشت. با وجود حلالیت کم استروویت (کم‌تر از 5%) اثر زراعی برابر و برتر با کودهای تجاری فسفره دارد. بنابراین بازیابی فسفر از لجن فاضلاب به‌صورت استروویت به‌عنوان یک راهکار مدیریتی مؤثر در تامین فسفر خاک و گیاهان توصیه می‌شود.

کلیدواژه‌ها

سوپر فسفات تریپل
فسفات آمونیوم منیزیم
فسفر اولسن و گندم
موضوعات

عنوان مقاله English

Effect of combined application of struvite recovered from sewage sludge and triple superphosphate on phosphorus bioavailability in soil and its uptake by wheat

نویسندگان English

Taleb Nazari 1
Mojtaba Barani Motlagh 2
Seyed Omid Rastegar 3
Mohammad Hosien Sedri 4
1 PhD Student, Department of Soil Science and Engineering, Faculty of Soil and Water Engineering, Gorgan University of Agriculture and Natural Resources , Iran
2 Associate Professor, Department of Soil Science, Faculty of Soil and Water Engineering, Gorgan University of Agriculture and Natural Resources , Iran
3 Associate Professor, Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
4 Associate Professor, Soil and Water Research Department, Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, Iran
چکیده English

Introduction: The recovery of phosphorus as struvite from treatment plants has attracted researchers' attention due to its potential as a phosphorus fertilizer. Struvite is a white crystalline substance consisting of magnesium, ammonium and phosphorus in equal molar concentrations (MgNH4P04.6H2O). The low water solubility of struvite is thought to limit its agronomic utility as a phosphorus (P) fertilizer compared with highly soluble P fertilizers (triple superphosphate). Because limited studies have been done regarding the effect of struvite on the availability of phosphorus in calcareous soils. Therefore, this study examines the effect of struvite replacement with triple superphosphate fertilizer on phosphorus availability in wheat plants in calcareous soils deficient in phosphorus.

Methods and Materials: Soil with phosphorus deficiency was collected from 0-30 cm depth under arable lands of Hajjiabad-e Seyyedeh located in Ghorveh township, Kurdistan Province, Iran. The soil was air-dried and ground to pass through a 2-mm sieve, followed by laboratory analysis to determine its physico-chemical properties. Struvite used in the research was obtained by optimizing the three main factors of sulfuric acid concentration, solid-to-liquid ratio, and time for the leaching process, and the three key factors of Mg/P ratio, N/P ratio and pH for the precipitation process by Response Surface Methodology. To achieve the aim of this study The factorial experiment was carried out in the form of a completely randomized design in 3 replications. The factors include the application of different proportions of struvite replaced with triple superphosphate in 6 levels (S0:P0, S0:P100, S25:P75, S50:P50, S75:P25 and S100:P0) and 3 levels of phosphorus (50, 100 and 150 kg/ha) and a total of 54 pots. The application rate for struvite was calculated based on total phosphorus (P2O5) of triple superphosphate. Then 10 wheat seeds were planted in each pot at 2-cm depth which after plant emerging and greening declined to 4 plants in each pot. The pots were randomly moved twice a week during the growth period to eliminate environmental effects. Irrigation and weeding operations were done by hand. Plants (shoots and roots) were harvested 60 days after planting (beginning of flowering), washed with distilled water and dry with tissue paper. The samples were air-dried and then oven dried at 70˚C to a constant weight in a forced air-driven oven. Phosphorus concentrations in plant extracts by the molybdenum vanadate or yellow method and Nitrogen concentration in plant was measured by the Kjeldahl method. After harvesting the plants, the soil was immediately air-dried and passed through a 2mm sieve. Then, the amount of phosphorus was determined by Olsen method. The statistical results of the data were analyzed using SAS software and LSD test (at 5% level) was used for comparing the mean values.

Results and Discussion: Based on the obtained results, all of the investigated treatments and their interactions were significant at the probability level of one percent (P < 0.01). The comparison of the average effects of different struvite treatments showed that by replacing struvite instead of triple super phosphate fertilizer in all three levels of fertilizer, the highest shoot fresh weight (with an average of 7.79 gr/pot), shoot dry weight (with an average of 1.13 gr/pot) shoot Nitrogen concentration (with an average of 4.82%) and its uptake (with an average of 5.44 gr/pot) was obtained from the application of S75:P25 150 kg/h superphosphate fertilizer. Also, the results showed that the highest amount of phosphorus concentration and uptake, respectively, with an average of 0.174% and 0.197 gr/pot, was obtained from the application of the S75:P25 treatment with 150 kg TSP/ha, which is compared to the application of the S75:P25 treatment of 50 and 100 kg TSP/ha had an increase equivalent to 26.43, 59.89, 11.49 and 43.14% respectively. The results also showed that the highest amount of soil phosphorus after harvesting the plant with an average of 18.95 mg/kg was obtained from the S100:P0 treatment with 150 kg TSP/ha, which compared to the S100:P0 treatment with 100 and 50 kg TSP/ha with an average of 13.29 and 12.56 mg/kg had an increase equivalent to 29.86 and 33.72%, respectively.

Conclusions: In spite of its low solubility, struvite is as effective as highly soluble phosphorus fertilizers for plants. There is still a lack of clarity regarding the mechanisms of struvite dissolution as well as the reasons behind this apparent dichotomy. Therefore, more accurate measurements of pH and EC in substrates, analysis of soil properties and fractionation of phosphorus in soil will enhance our understanding of the use of struvite. Therefore, it is recommended to optimize the timing and application rate of struvite in relation to the demand for different agricultural and garden crops

کلیدواژه‌ها English

Magnesium ammonium phosphate
Olsen P
Triple superphosphate
Wheat
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مهندسی زراعی
دوره 47، شماره 3
پاییز 1403
صفحه 299-322

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