Wajid Umar Phd

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• PostDoc
• Research Scientist at Leibniz Institute for Agricultural Engineering and Bioeconomy

The fertilizer use-efficiencies particularly of nitrogen (N), phosphorus (P), and zinc (Zn) in alkaline soils are often seriously low. The surplus N released from the conventional fertilizers pollutes the environment and causes climate change. Slow or controlled release N fertilizer can improve its use efficiency and decrease its environmental impa...

Nitrification inhibitors (NIs), especially dicyandiamide (DCD) and 3,4-dimethylpyrazole phosphate (DMPP), have been extensively investigated to mitigate nitrogen (N) losses from the soil and thus improve crop productivity by enhancing N use efficiency. However, to provide crop and soil-specific guidelines about using these NIs, a quantitative asses...

Overuse of chemical fertilizers in agroecosystems leads to the increased economic burden, low crop production in terms of input and environmental pollution. Due to its improved nutrient management and degrading properties, synthetic slow release fertilizers have become a significant advancement in the fertilizer sector. In this study we evaluated t...

‘All we are is a lot of talking nitrogen’ stated by an American playwright, Arthur Miller, precisely expressing the crucial nature of nitrogen for the ecosystem. On the one hand, nitrogen deficiency limits food production in developing areas, while excessive nitrogen compromises soil fertility, human health, and agricultural and environmental susta...

Nitrogen (N) and phosphorus (P) are two significant macronutrients for the growth and development of the plant. These two nutrients represent the highest percentage of fertilizer manufacturing and consumption in the agriculture sector. Though applied in versatility, N and P are subjected to huge losses in terms of fixation, leaching and volatilizat...

Enzymes, essential proteins in nature, assume a paramount role within wastewater treatment, particularly in harnessing microbial catalysts to revolutionize conventional methods. These specialized agents act as linchpins, affecting a radical departure from traditional practices and expediting diverse treatment processes. Their catalytic prowess not...

Citation: Umar, W.; Czinkota, I.; Gulyás, M.; Ayub, M.A.; Sebők, A.; Nadeem, M.Y.; Zulfiqar, M.A. Effect of Soil Texture, Nanoparticle Size, and Incubation Period on the Dissolution of ZnO Nanoparticles. Pollutants 2023, 3, 220-231. Abstract: Zinc is an essential plant and human nutrient and its primary source is Zn-rich food consumption. The only...

Introduction The increasing use of cerium nanoparticles (CeO2-NPs) has made their influx in agroecosystems imminent through air and soil deposition or untreated wastewater irrigation. Another major pollutant associated with anthropogenic activities is Cd, which has adverse effects on plants, animals, and humans. The major source of the influx of Cd...

Lettuce is an important leafy vegetable and an excellent source of phytochemicals in human diets. However, the metabolic levels in different green and red-type lettuce varieties are not fully explored. Therefore, it is important to explore and identify the selected health-promoting secondary metabolites in green and red-type lettuce varieties with...

The study was conducted at Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan to monitor the impact assessment of tillage systems on soil health indicators by integrating organic and inorganic resources to sustain wheat production in arid and semi-arid conditions i.e. high temperature and low rainfall. The...

Metal and Metalloid elements have rich chemistry in agroecosystem with widespread diversity, dynamics, and transformations. Among all metal/metalloid elements, some are classified as heavy metal/metalloid contaminants or pollutants (HMPs) while other as heavy metal nutrients (HMNs). The HMPs includes Cd, Pb, Hg while As is metalloid and all of thes...

Anthropogenic activities such as mining, industrialization, and several agricultural practices increase heavy metals (HMs) concentration in soil, air, and water. Heavy metal contamination of soil poses hazardous environmental threats to plants, animals and humans. It is very tough for the plants to survive in HMs contaminated soils and ultimately,...

This book examines a wide range of emerging sources off water pollution. It consists of thirteen chapters dedicated to the topic, giving readers comprehensive information about the types of materials involved and the solution for their removal. The first five chapters present an analysis of the emerging water pollutants, their toxicities, legislati...

Nanoparticles (NPs) and nanomaterials are readily being used in industry, agriculture, water treatment, and health sector. The agricultural soils are receiving wide range of nanomaterials (intentionally as a nano amendment or unintentionally via point and nonpoint sources), raising concerns to check their effects on plants. A wide range of research...

Heavy metals and persistent organic pollutants are causing detrimental effects on the environment. The seepage of heavy metals through untreated industrial waste destroys the crops and lands. Moreover, incineration and combustion of several products are responsible for primary and secondary emissions of pollutants. This review has gathered the reme...

Nitrogen (N) is an essential element for plant growth and development. The application of a balanced and optimal amount of N is required for sustainable plant yield. For this, different N sources and forms are used, that including ammonium (NH4+) and nitrate (NO3−). These are the main sources for N uptake by plants where NH4+/NO3− ratios have a sig...

Although the study of microplastics in the aquatic environment incorporates a diversity of research fields, it is still in its infancy in many aspects while comparable topics have been studied in other disciplines for decades. In particular, extensive research in sedimentology can provide valuable insights to guide future microplastics research. To...

Global food security is coupled with the preservation and safe use of arable land resources. Land use competition in terms of commercial land use and urbanization has imparted enormous pressure on soil resources. The arable land of the world is already shrinking due to land degradation and desertification while our efforts to ensure commercial land...

Various kinds of environmental stresses are the main cause of the reduced productivity of crops globally including abiotic and biotic stresses.The abiotic stress includes salinity, heavy metals, cold, heat, freezing, flooding, etc. and causes significant global food loss annually. On the other hand, bacterial, fungal, nematodes, and herbivores atta...

The agriculture sector worldwide is facing immense pressure to ensure sustainable production for an ever-increasing population. The role of human urbanization in this regard is very negative as anthropogenic activities are making soils go nonproductive as well as excessive and unjust use of agrochemicals has made us dependent on them. To ensure per...

Wastewater management is a critical issue around the globe in a scenario of an ever-increasing population, the build-up of industries, and the scarcity of freshwater resources. In this era of changing climate and depletion of freshwater, wastewater irrigation is not less than a blessing in water-deficient areas. Various types of (organic/inorganic)...

Sewage sludge (SS) is by product of wastewater treatment which includes nutrients, organic matter and harmful constituents i.e. micro-pollutants, heavy metals and pathogens. The sludge is a great way to improve yields and can potentially provide nutrients to enhance the fertility of soil. However, it can also contain numerous inorganic (heavy metal...

Increasing the world population is the main factor for rapidly increasing urbanization which is coupled with different types of pollutions i.e. Air pollution, Water pollution, and Noise Pollution. It’s the only reason for deteriorating environmental health and impacting human health and living standards. Water pollution is the key factor responsibl...

An increase in the global population has led to a net shift of the global community to move towards cities from per-urban and village areas due to various reasons. This population pressure has made a net expansion of cities over time making urban-periurban fringe quite non-distinguishable in past decades. Especially in developing countries, these c...

Global food security is coupled with the preservation and safe use of arable land resources. Land use competition in terms of commercial land use and urbanization has imparted enormous pressure on soil resources. The arable land of the world is already shrinking due to land degradation and desertification while our efforts to ensure commercial land...

Natural ecology has been affected by the cosmetic inclined towards urbanization and industrialization. Water and land resources are the major entities to be affected by this revolution. These resources are not only shrinking but also deteriorating due to a variety of anthropogenic activities. Land degradation possesses a severe threat to sustainabl...

Among all micronutrients, metallic micronutrients are heavy metals by nature. These heavy metal micronutrients (HMmNs) are necessary for the proper functioning of plant cells, growth, and defense mechanisms but can be toxic to plants when taken up in higher concentrations. On the other hand, their deficiency can also cause physiological disturbance...

Plants take micronutrients from the rhizosphere via roots and translocate them to the other parts (shoot and seeds). These nutrients are very much needed in plant tissues for effective completion of plant's metabolic functions thus their retention and assimilation in plant tissues is of utmost importance. During the whole process of nutrient uptake...

Metal oxide nanoparticles (MONPs) with an inorganic core composed of a metallic element bonded to oxide (O2 −) anions have been widely used in fertilizers, water treatment, health, cosmetics, electronics, food packaging, and even food products. The production, usage, and disposal of MONPs-containing products are potential routes for environmental e...

Arable lands are the major source of food production worldwide. Increasing crop cultivation in the response to population pressure and the use of synthetic fertilizers and chemicals are the main reasons for the conversion of arable lands into problematic soils. Increasing food demand requires to increase the per acre yield of agricultural crops res...

Zinc (Zn) deficiency is common on calcareous soils due to fixation with soil components and precipitation with other ions. ZnO nanoparticles (ZnO NPs) may serve a better source of Zn for improved growth and biofortification in maize grains. Pot and field experiments were conducted to evaluate the effect of ZnO nanoparticles in comparison with conve...

Pakistan is an agricultural country; major part of its population depends on agriculture. Pakistan is located between longitude 61° and 76° E and latitude 24° and 37°N. Major part of the country lies in semi-arid to arid region receiving annual rain fall 250 mm and ranges from 100 – 760 mm. Most of the area of Pakistan receives annual rainfall less...

An experiment was conducted during 2014-15 and 2015-16 at Agronomic Research Area, University of Agriculture Faisalabad, to study the effect of various doses and methods of zinc application on maize and wheat. The treatment consisted of control, 12.5 kg ZnSO4 ha-1, 25 kg ZnSO4 ha-1 and foliar spray of 0.5 % ZnSO4 and two wheat Varieties 'AARI 2011'...

Okra (Abelmoschus esculentus) is a valuable vegetable crop of Pakistan. It is predominantly hosted by pathogens that reduce its yield and quality. Among these yield reducing agents, root knot nematodes are very important due to their board host rang. Because of root knot nematode infestation, huge yield losses are caused by Meloidogyne incognita. C...

Soybean has become an increasingly important agricultural commodity, with a steady increase in worldwide annual production. The worldwide increasing demand of soybean is due to its unique composition and excellent nutritional value. A field experiment was conducted to evaluate the yield stability and performance of various soybean genotypes at Agro...

The late sowing of wheat is the major problem of low wheat yield in Pakistan due to delayed harvesting of rice and cotton in rice-wheat and cotton wheat cropping system. Priming and foliar application of different agents may be used to increase the yield of late sown wheat. This field experiment was conducted to evaluate the growth and yield respon...

ABSTRACT Salinity, a wide-spread problem on the globe which impairs the crop production on at least 20% irrigated lands worldwide. Glycophytes, are those plants which grow only in soils with low sodium salt and even killed by 100-200 mM of NaCl. Salt stress significantly reduces the growth and productivity of glycophtes, which are majority of agric...

Abstract Salinity is among the most ruthless environmental factors restricting the crop production. Most of the crops are sensitive to salinity, and the areas having the problem of salinity increasing day by day. Continuously increasing world population will demand more food in near future. We need to cope with such situations in a technical way, s...

Abstract Salinity is the major abiotic stress that limits the crop growth and production in many areas of the world. About 20% of cultivated land in the world is affected by salinity and this amount is increasing constantly due to use of poor quality of water for irrigation. In plants, many physiological activities such as respiration, photosynthes...

ABSTRACT Micronutrients deficiency is an important constraint not only for good crop production but also for human health. Zinc (Zn) and Boron (B) are important micronutrients whose roles are well documented for improving the growth and production of maize crop. Application of Zn and B could be a suitable option to fulfill the crop demand for Zn an...

ABSTRACT The present study was carried out over a period of three months from mid-September to mid-December 2014-15 for two consecutive years at Nursery Sanitation Project, Institute of Horticultural Sciences, University of Agriculture, Faisalabad. Influence of different IBA concentrations (0 mg kg-1, 250 mg kg-1 and 500 mg kg-1) and cutting taking...

The main objective of this study was to determine the possible effects of Nigella sativa on immune-response and pathogenesis of H9N2 avian influenza virus in turkeys. The experiment was performed on 130 non vaccinated mixed-sex turkey poults, divided into five experimental groups of 30 birds each. Group A was kept as non-infected and a non-treated...

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). The authors retract the above paper due to: 1) conflict of interest among the authors; and 2) addition of coauthor Dr. Muhammad Younus without his knowledge or permission. The authors apologize for these two grave mis...

Water coolers are common source of drinking water in teaching institutes of Lahore. Drinking water from water coolers has the potential to cause waterborne diseases to consumers due to contamination with different microbes and chemicals. Present study aimed to assess cooler water quality from different teaching institutes in Lahore city. A total o...

Water is principle constituent of living bodies and it is vital nutrient needed to sustain life. Water quality is an important parameter, directly or indirectly affecting feed intake and physiological health status of animals thus influencing on productivity and performance. Total dissolved solids [TDS], turbidity, temperature, mineral, pH, hardnes...