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Home > Soil Retention and Bioavailability of Chlorpyrifos to Maize in Soil Receiving Different Organic Amendments

Soil Retention and Bioavailability of Chlorpyrifos to Maize in Soil Receiving Different Organic Amendments

Thesis Info

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Author

Aziz, Humera.

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2018

Thesis Completion Status

Completed

Subject

Natural Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/9504/1/Humera%20Aziz_Soil%20Sci_2018_UAF_PRR.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727182662

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Chlorpyrifos (CP) is a toxic organophosphorus pesticide. Owing to its large scale field application, its residual contents have been reported in different fruits, vegetables, crop plants, soils and waters. Due to its persistency it can enter in food chain and prove harmful for humans and animals. Therefore it has become imperative to restrict its entry in agricultural products for food safety. Therefore, two laboratory and one greenhouse pot experiment were conducted to test the effect of biochar and compost amendments on the sorption, persistence and bioavailability of CP using five different CP concentrations (5, 10, 50, 100 and 200 mg L-1) and two levels 0.25 and 0.50 % of compost and biochar. The sorption of CP on amended and unamended soil was tested using batch equilibrium method. Freundlich model fitted well and explained the sorption behavior of CP. Both compost and biochar significantly increased the sorption of CP and the maximum sorption capacities achieved at 0.50 % levels. However, biochar at both levels showed high sorption capacities for CP compared to compost. The degradation kinetics of CP at two initial concentrations (100 and 200 mg kg-1) was tested in controlled conditions in a laboratory incubation trial in unamended (sterilized and nonsterilized) and amended (sterilized and non-sterilized) soil with biochar and compost (at 0.25% and 0.50% of each). The degradation data of CP in amended and unamended soil was subjected to first order kinetic model. CP at 200 mg kg-1 showed less degradation rate compared to 100 mg kg-1. The CP half-lives of 30 and 60 days were recorded at 100 and 200 mg kg-1 respectively in non-sterilized soil which were increased to 94 and 125 days in sterilized soil. Incorporation of compost and biochar in CP contaminated soil affected differently to the CP degradation and higher degradation of CP was recorded in compost amended treatments than unamended as well as biochar amended treatments CP significantly reduced the soil dehydrogenase, urease and phosphatase activities at the initial stage of incubation. Both amendments significantly alleviated the negative effect of CP on all studied enzymes activities and compost showed even higher enzyme activities compared to control even in the presence of CP. xv A greenhouse pot experiment was conducted to evaluate the influence of biochar and compost amendments (at 0.25% and 0.50% of each) on the uptake of CP (at 100 and 200 mg kg-1) to maize plants. The CP was toxic at both loadings and significantly reduced the shoot and root fresh biomass as well as all tested physiological parameters. Maize plants showed increased residual concentration of CP in both shoots and roots with increasing level of CP. Maize plants induced variations in antioxidant enzymes activities in response to CP stress. Application of both biochar and compost amendments alleviated the adverse effects of CP in all studied parameters as manifested by the improvement in maize fresh biomass and physiological parameters, recovered antioxidant enzymes activities and decreased residual CP concentration in both roots and shoots of maize. However, biochar at 0.50% level was more effective in reducing uptake of CP by maize plants compared to compost.
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علم روشنی ہے

علم روشنی ہے
نحمدہ ونصلی علی رسولہ الکریم امّا بعد فاعوذ بااللہ من الشیطن الرجیم
بسم اللہ الرحمن الرحیم
معزز اسا تذہ کرام اور میرے ہم مکتب ساتھیو!
آج مجھے جس موضوع پر اظہار خیال کرنا ہے وہ ہے:’’علم روشنی ہے‘‘
معزز سامعین!
علم روشنی ہے ،علم نور ہے علم ایک خزانہ ہے، یہ ایسے جملے ہیں کہ جو ان کے مفہوم کو اپنے ذہن کے در یچوں میں، قلب و اذہان کے کونے کھدرے میں جگہ دے وہ یکتائے روزگار بن جاتا ہے۔ علم کی روشنی جہالت کی تاریکی کا خاتمہ کر دیتی ہے اورعلم کی ناخدائی سے بحرِجہالت میں ہچکولے کھانے والی ناؤ کو کنارے لگانے میں کامران ہو جا تا ہے۔
صدرِذی وقار!
جہاں علم کی روشنی کی کرنیں پہنچیں وہ سرزمین بقعۂ نور بن گئی ، وہ خزاں رسیدہ دل و دماغ بہار آشنا ہو گئے، وہ پژمردہ شعور، شعوری دنیا کے حکمران بن گئے، وہ خس و خاشاک پیدا کرنے والی سرزمین حامل گل وگلزار ہوگئی، منحوس تصور کیے جانے والے بوم جو جہالت کا مرقعّ تھے اُن کا وجود عنقا ہو گیا، علم کے شاہینوں نے قصرِ سلطانی کے گنبد کو چھوڑ کر جبال شامخہ میں اپنا مسکن بنانا شروع کر دیا۔ علم کے طائر لا ہوتی نے اپنی پرواز بلند کرنا شروع کر دی۔
صدرِمحترم!
علم واقعی ایک روشنی ہے جس گھر میں اس کی قندیلیں روشن ہوں وہ گھر اعلیٰ و ارفع ہوتا ہے، جس معاشرے میں صاحب ِعلم حضرات موجود ہوں وہ معاشرہ صحت مند معاشرہ کہلاتا ہے، جس قوم میں اربابِ علم و دانش موجود ہوں وہ قوم دیگر اقوام سے بدر جہا بہتر ہوتی ہے، وہ ملک کے ماتھے کا جھومر ہوتی ہے، وہ اپنی سلطنت کے لیے رحمت ہوتی ہے وہ قوم اللہ کا ایک انعام ہوتی ہے، اُس قوم کے...

Information Management From the Interpretation of Al-Quran: Study on Tafsir Nur Al-Ihsan

The development of works in the field of Quranic interpretation has grown rapidly in this age. The work in this field has been written in various major languages of the world such as Arabic, English and Malay. The resulting works contain a lot of information quoted from the works written by previous authors. For example, the work of Tafsir Nur al-Ihsan written by Muhammad Said Omar contains a lot of information quoted from Tafsir al-Jalalyn, Tafsir al-Baydawi and Tafsir al-Jamal. Nevertheless, this study found that the information was widely quoted by the author until there was an inaccurate information being referred to by him. Therefore, a method or system should be practiced so that the information contained in the work of Tafsir Nur al-Ihsan can be managed well as well as avoid the mistakes of readers. One way to manage these resources is to identify the original work referred to by the author. The analysis of Tafsir Nur al-Ihsan used the genetic approach which was published by Goldman in studying the origin of the resources. This study referred the text from Tafsir Nur al-Ihsan and the texts of works that became author's references, which are Tafsir al-Jalalyn, Tafsir al-Jamal, Tafsir al-Baydawi, Tafsir al-Khazin, Tafsir al-Baghawi, Tafsir al-Tabari, Tafsir al-Qurtubi, Tafsir al-Razi, Tafsir al-Nasafi, Tafsir Ibn Kathir and Tafsir al-Tha’labi, and made a comparison of the texts to detect the similarities and differences. The result of the analysis proved that Syeikh Muhammad Sa’id implemented five methods; which are quoting the text in parallel, writing an abstract, removal of some of the words, adding explan-ation, and refuting part of the text. This study also revealed the purpose of Syeikh Muhammad Sa’id while creating his work is to strengthen the translations written. Thus, he successfully strengthens translation when the contents of the text are parallel to the reference. However, in certain places existed a text from the author's references contradicts with the content of Tafsir Nur al-Ihsan, which failed his attempt to strengthen the translation in certain part of the text. Key words: , , .

Effect of Plant Growth Promoting Rhizobacteria Pgpr and Cytokinins on the Growth and Yield of Wheat Triticum Aestivum L. under Drought

Drought effects plant internal functions as the constraint for production. Different strategies are using to mitigate it. Plant growth promoting rhizobacteria (PGPR) and cytokinins (CK) plays important role under water stress and help to enhance crop growth. Seed inoculation with PGPR is increase soil fertility. Growth hormones like cytokinins improve plant functions and actual yield through exogenous application. To determine the effect of PGPR and cytokinins on the growth and yield of wheat under drought, planned wire house and field experiment were arranged at the research area of Agronomy Department, The Islamia University of Bahawalpur. Four wire house experiments and three field experiments were set, to check PGPR and CK effecr wheat growth and yield under drought. First wire house experiment was the screening of best genotype of wheat variety in drought. 10 different wheat varieties (V1= Aas-2011, V2= Mairaj-2008, V3= Fareed-2006, V4= Punjab-2011, V5= Lasani-2008, V6= Faisalabad-2008, V7= Galaxy2013, V8= Millat-2011, V9= AARI-2011, V10= Uqaab-2000) were used for screening under water deficit stress at tillering, anthesis and grain filling stage to identify best genotype under drought stress under agro ecological conditions of Bahawalpur. Galaxy2013 was observed the highest yielding variety under drought stress among them. It was also noticed that drought stress damaged crop functions and growth. Second experiment was to identify the best PGPR strain. Azospirillum, Bacillus, Rhizobium, Pseudomonas, Enterobacter and Moraxella were isolated from soil rhizosphere of Acacia nilotica under. A. brasilense Azo-1 was selected as a best PGPR strain among them. Next experiment was carried in both wire house and field entitled, “Cytokinins applied under drought stress to improve growth and physiological efficiency of wheat (Triticum aestivum L.)”. Seven treatments were used in experiment (To =Control, T1 =Drought at tillering, T2 =Drought at tillering + CKs Application, T3 =Drought at anthesis, T4 = Drought at anthesis + CKs Application, T5 = Drought at grain filling, T6 = Drought at grain filling + CKs Application). 5th experiment (wire house) was arranged to investigat the effect of Azospirillum brasilense and Rhizobium pisi on agronomic traits of wheat (Triticum aestivum L.) and results showed that co-inoculation gives the best results. 6th experiment was carried under field condition entitled, “Use of Azospirillum brasilense as a drought management tool in wheat crop” and noticed that A. brasilense inoculated wheat plants under drought showed more yield as compared to un-inoculated treatments. 7th, 2 years experiment was arranged to investigate the combine effect of PGPR and CK under drought stress in wheat crop. 13 treatments were used (To=Control, T1=Drought at tillering, T2=Drought at tillering +PGPR, T3=Drought at tillering +CKs, T4 = Drought at tillering +PGPR+CKs, T5 = Drought at anthesis, T6=Drought at anthesis +PGPR, T7=Drought at anthesis +CKs, T8=Drought at anthesis +PGPR+CKs, T9 = Drought at grain filling, T10 = Drought at grain filling +PGPR, T11 = Drought at grain filling+ CKs, T12 = Drought at grain filling +PGPR+CKs) in this experiment having three replications. Combined application of PGPR and CK is more beneficial for alleviation of drought. 5.90%, 3.49%, 4.09% and 6%, 8.51%, 4.07% more grain yield was recorded during 2016-17 and 2017-18 respectively, by combine application of PGPR and CK under drought. Beneficial bacteria colonize the rhizosphere impart drought tolerance. CK participate in removing of ROS from the cell and increases antioxidant enzymes during drought stress so plant growth and yield improved under such condition.