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Home > Boron Dynamics in Alkaline Calcareous Soils and its Availability under Wheat-Cotton Cropping System

Boron Dynamics in Alkaline Calcareous Soils and its Availability under Wheat-Cotton Cropping System

Thesis Info

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Author

Niaz, Abid

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/720

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725652224

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Wheat (Triticum aestivum L.) is the world’s leading cereal crop and is unanimously consumed as staple food product of almost hundred percent Pakistani nationals as well as about 1/3 rd population of the world. Cotton (Gossypium hirsutum L.) is an important cash crop of Pakistan but the yields of wheat and cotton in Pakistan have been stagnated throughout the preceding decade due to improper fertilizer management and non- exploitation of micronutrients specially boron. Boron (B) is extraordinary amongst the microelements in that an extremely diminutive amount is required for ordinary growth and maturity of plants, and simply somewhat greater B concentrations are toxic. A three- year (2005-2008) study was initiated to determine the boron status of soils under wheat- cotton system and also to assess the relationship between soil B and physico-chemical properties of soils. B content present in canal and tubewell waters being used by wheat- cotton, were also assessed. The responses of cotton and wheat crops to foliar and soil applied B were also studied under field conditions. Almost all the soils were calcareous in nature (92 % area), alkaline in reaction (83 % area had pH > 8) and 100 % area had OM < 1 %. In case of soil B content, 82 % soils were deficient in B (0.10 to 0.45 μg g -1 ), 15 % were adequate (0.46 to 0.55 μg g -1 ) and only three samples were sufficient (0.56- 0.91 μg g -1 ). More B was observed in the fine textured soils (28 % area). Low B concentrations were observed in wheat and cotton plants. The average B concentrations during 2006 and 2007 in wheat leaves were 8.86 and 4.41 mg kg -1 , and in cotton 37.78 and 15.83 mg kg -1 . Mean B content in canal water was more during monsoon season (0.14±0.10 mg L -1 ) as compared to that during winter season (20±0.13 mg L -1 ), respectively. Whereas, B concentration was more in tubewell waters as compared to that in canal waters. B fractionation study revealed that the highest mean plant available B (0.32±0.12 mg kg -1 ) was obtained by hot water extraction followed by 0.05M HCl (0.31±0.12 mg kg -1 ), and 1:2 water extraction whereas the lowest B concentration was extracted by 0.005M DTPA. Total soil B content of all the soils varied from 15.61 to 152.80 mg kg -1 and it was further fractionated by using 0.05 M HCl (readily soluble B), 0.05 M KH 2 PO 4 (exchangeable B), 0.02 M HNO 3 -H 2 O 2 (extractable B), 0.25 M NH 4 - oxalate extractable B and the residual B. The highest mean B fraction was the residual fraction (70.50 mg kg -1 ) whereas the lowest was the water soluble B (0.33 mg kg -1 ). Field 15experiments were conducted at three different textured soils (loam, sandy clay loam and silt loam). Ten B treatments were applied to soil (0.00, 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00 and 3.00 kg B ha -1 at sowing along with recommended NPK fertilizers for -1 cotton and wheat. Whereas five B levels (0.00, 0.25, 0.50, 0.75 and 1.00 kg ha ) were used for foliar application in three replications in RCBD, while all other recommended nutrients for cotton and wheat were applied. Foliar sprays were performed on cotton before flowering, at flowering and at boll formation stages while on wheat before tillering, at booting and at milking stages. B application as soil and foliar sprays significantly increased the number of bolls, boll weight, lint, seed cotton, dry matter yield, lint percent, leaf B concentration and total B uptake. Foliar use of B (0.50 kg B ha - 1 ) increased the seed cotton yield by 25.60 % over control on loamy soil followed by that on silt loam soil (23.80 %), however during the next year (2007), seed cotton yield mildly decreased compared to first year at the same B application level of 0.50 kg B ha -1 but it remained significantly higher than control by 8 and 21.50 % at loam and silt loam soil (23.80 %), respectively. Likewise, wheat crop significantly responded to B application both as soil and foliar in terms of grain and straw yields, number of grains spike -1 , 1000- grain weight, plant height, plant B concentration and total B uptake while it had non- significant effects on tillering and protein content. B application improved the grain yield by around 6, 9.60 and 6 % at B application levels of 0.50, 0.75 and 1 kg ha -1 , respectively. Finally, the residual or carry-over study revealed significant responses of wheat crop to residual B applied to previous cotton crop. Residual B significantly improved the grain and straw yields, number of grains spike -1 , 1000-grain weight, plant height, plant B concentration and total B uptake and protein content of wheat. The highest and the lowest protein content of 14.54 and 11.17 % were obtained with residual B levels of 1.50 and 3 kg ha -1 , respectively.
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متنی تنقید اور اس کے مدارج

موضوع7:متنی تنقید اور اس کے مدارج
متنی تنقید :
انسائیکلو پیڈیا ’ امریکانا ‘ نے متنی تنقید کی تعریف کرتے ہوئے لکھا ہے :
’’ متن کے اصل الفاظ کے تعین، اسے مکمل کرنے اور واقفیت واصلیت تلاش کرنے کی غرض سے پرانی تحریروں کے سائینٹفک مطالعے کو متنی تنقید کہتے ہیں۔ ‘‘
متنی تنقید کا اصل مقصد حتیٰ الامکان متن کو اصل روپ میں دوبارہ حاصل کرنا ہوتا ہے۔ اصل روپ سے مراد وہ شکل وصورت ہے جو متن کا مصنف اپنی تحریر کو دینا چاہتا تھا۔ یعنی اگر متنی نقاد کو مصنف کے ہاتھ کا لکھا ہوا نسخہ ملا ہے تو اسے متنی نقاد من وعن ہی شائع نہیں کرسکتا کیونکہ ممکن ہے مصنف سے کچھ الفاظ چھوٹ گئے ہوں یا کچھ الفاظ دوبارہ لکھ دئیے گئے ہوں یا اس قسم کی کوئی اور غلطی ہوئی ہو۔ ایسی صورت میں متنی نقاد کا فرض ہے کہ متن کو ان غلطیوں سے پاک کرے۔ متن کے لیے ضروری ہے کہ بامعنی ہو، اگر سینکڑوں برس کے عرصے میں نقل در نقل کی وجہ سے متن مسخ ہوگیا ہے تو اس کے اصل معنی کا تعین کیا جاسکے۔
متنی تنقید/تنقیدِ متن کے مدارج :
۱۔ تیاری ۲۔ مواد کی فراہمی
۳۔ متن کی تصحیح ۴۔ قیاسی تصحیح
۵۔ اعلیٰ تنقید
۱۔ تیاری :
الف۔مختلف عہد کے نسخے پڑھنا :
متنی نقاد کا فرض ہے کہ مختلف عہد کی تحریروں پر عبور حاصل کرنے کے لیے ان عہدوں کے نسخے پڑھے تاکہ تحریر کی شناخت کے ساتھ ساتھ اس عہد کے الفاظ وتحریر پر اسے عبور حاصل ہوسکے۔ متنی نقاد کو اس عہد سے قبل کے کچھ نسخے بھی پڑھنے چاہئیں۔ اس انتخاب کے باقاعدہ اصول تو نہیں ہیں لیکن اس عہد میں جولوگ ادب پر چھائے ہوں ان میں سے نمایاں لوگوں کو منتخب کرلیا جائے۔

Scope of State in Legislation from Islamic Perspective

Islamic law is basically a part of a holistic system based primarily on the divine message enclosed in the Holy Qur'an and traditions of the Prophet (SAW), which are the main fundamental sources of Islamic law. After the demise of the Prophet (SAW), field of Ijtehād started development, which was already approved by the Prophet (SAW) in his life. The companions of the Prophet (SAW) developed the notion of Ijmā while early Muslim jurists discovered the Qiyās, Maslaha, Istislāh, Istehsān etc. Determining the location of authority and its scope in law-making has remained a complex situation for the western philosophers since long. As far as the case of Muslims is concerned, they are in the position to find solution of this situation as to where the authority dwells; enabling them to resolve many queries which seemed to be unanswered for the long time. It is important for the Muslims to comprehend the concept of Islamic institutions from the perspective of Islamic frame work and legal as well as constitutional history of Islamic history.

Nonlinear Stochastic Analysis of Machinery Health Dynamics

Condition based maintenance of machinery is being much talked about in the engineering sector of defense and commercial industry. A lot of expenditure is generally incurred on condition monitoring of machinery to avoid unexpected downtimes and failures vis-à-vis optimizing machinery operation. The concept is ever evolving due to technological advancements as well as with the emergence of unique nature of defects in complex systems. The features of machinery health extracted through modern condition monitoring technologies helps in diagnostics of current health; however, utilizing the current data for prediction of future machinery state i.e Prognostics is a challenging task. Prognostic is one of the key elements of modern maintenance philosophies. Effective prognostic, from the machinery data, leads towards operational reliability, reduced machinery downtime, cost savings, secondary/catastrophic failures etc. Machinery health prognosis follows a sequential methodology inclusive of various processes ranging from data acquisition till remaining useful life estimation. Every step depicts distinct statistical features, which are helpful in estimating present and future health state of a machine. Various methodologies have been adopted by the researchers in an effort to precisely forecast/predict machinery health. Research in this area, where stochastic models have been applied, revealed encouraging results. In this thesis, we have presented three nonlinear stochastic models with their application on bearing health prognosis. These include Markov Switching Auto Regressive Model with Time Varying Regime Probabilities, Threshold Auto Regressive Model and Structural Break Point Classifier Model. The results showed that the applied models can be effectively utilized for data driven machinery health prognosis.