Zaid Khan - Academia.edu (original) (raw)

Papers by Zaid Khan

Journal of Infection and Public Health

Agronomy, 2021

Wood vinegar is formed by the condensation of smoke produced during the production of biochar. It... more Wood vinegar is formed by the condensation of smoke produced during the production of biochar. It mainly contains acetic acid, butyric acid, catechol, and phenol. Wood vinegar has a compound effect of promoting crop growth similar to plant growth regulators and is environmentally friendly. Moreover, it can enhance the biological and abiotic resistance of crops. In this study, foliar spraying was carried out systematically in the field with the hybrid variety of Huayouza 9 for two years to study the effects of wood vinegar and its compounds on the growth of rapeseed (Brassica napus L.). We applied four treatments with tap water as a control (CK), namely wood vinegar diluted 400-fold (M), M mixed with gibberellin (T1), M mixed with sodium D-gluconate (T2), and M mixed with melatonin (T3). They were sprayed in the seedling stage and overwintering stage, respectively. The results showed that the seed yield, the leaf area index, and the number of pods per plant of rapeseed treated with M...

Industrial Crops and Products, 2021

Abstract The depletion of soil fertility and freshwater reservoirs in dry and arid conditions of ... more Abstract The depletion of soil fertility and freshwater reservoirs in dry and arid conditions of the world are alarming for food and crop productivity. Although many research studies have explored the effect of biochar on plant growth and soil fertility, however, information on the role of biochar on rapeseed under drought stress is limited. The current study was conducted to investigate the effect of biochar on photosynthesis, antioxidants activities, osmolytes contents, growth and yield of rapeseed under drought stress. Rapeseed plants at the flowering stage were subjected to two moisture conditions, no stress (NS) and drought stress (DS) along with four biochar treatments (B0:0, B15:15, B30:30 and B60:60 t ha−1). Drought stress negatively affected rapeseed growth due to the over-production of hydrogen peroxide (H2O2) by increasing 45 %, malondialdehyde (MDA) 21 % and electrolyte leakage (EL%) 40 % in (BO + DS) treatment as compared to control (BO + NS). However, the addition of biochar at 30 t ha−1 alleviated the hostile effects of drought stress in rapeseed to reduce the contents of MDA, H2O2, EL by increasing the activities of superoxide dismutase (SOD) by 63 %, peroxidase (POD) 48 %, and catalase (CAT) 62 % compared to stress-controlled treatment (BO + DS). The results revealed that biochar could alleviate the harmful effects of drought stress by enhancing the activities of antioxidants, osmoprotectants, soil fertility, and the physiological processes of rapeseed which indicate that the biochar application might be a sustainable strategy to enhance rapeseed growth under drought stress.

Journal of Case Reports and Scientific Images, 2020

Xanthogranulomatous inflammation of ovary is a non-neoplastic, rare chronic process in which the ... more Xanthogranulomatous inflammation of ovary is a non-neoplastic, rare chronic process in which the ovary is damaged by massive cellular infiltration of foamy histiocytes admixed with plasma cells, fibroblasts, multinucleated giant cells, neutrophils, and necrotic foci. The etiology remains unknown, but it does share the histopathological findings of xanthogranulomatous change occurring in different organs, including the gallbladder and kidney. The current case was a 24 year old female presenting with an ovarian mass with high suspicion of malignancy on clinicoradiological evaluation. A vigilant histopathological study was carried out and the final diagnosis of xanthogranulomatous oophoritis was established.

Environmental Technology & Innovation, 2020

Abstract Jute (Corchorus capsularis) can generate substantial biomass and has the ability to upta... more Abstract Jute (Corchorus capsularis) can generate substantial biomass and has the ability to uptake large amounts of heavy metals from metal-contaminated soil. However, a low bioavailability of heavy metals in soil or other media and insufficient movement of heavy metals in the above-ground parts of the plant limit phytoextraction efficiency. The application of chelators, such as citric acid (CA) and ethylenediaminetetraaceticacid (EDTA), increases metal uptake by plants. In addition to improving the phytoextraction potential of a plant, chelator application can improve plant growth, chlorophyll contents, and gas exchange attributes while alleviating oxidative stress by enhancing the antioxidative defence system. This article discusses the individual and combinatorial effects of CA and EDTA on copper (Cu) uptake and its translocation to harvestable parts of C. capsularis. The effects on plant growth, biomass, chlorophyll contents, gaseous exchange attributes, oxidative stress, antioxidative enzyme and cellular organelles (transmission electron microscopy study) were investigated using 3 mM of EDTA and 3 mM of CA in Hoagland nutrient solution under a Cu level of 80 μ ML−1. All plants were able to grow for 28 days in the nutrient solution in a growth chamber (Philips 20W TLD, China) under conditions of 12 h natural light per day. The results revealed that, relative to the control treatment (no chelator application), the individual and combinatorial application of CA and EDTA increased the phytoextraction potential of C. capsularis by increasing Cu uptake in roots, stems and leaves. Furthermore, both chelators improved plant growth, biomass, chlorophyll contents, gas exchange attributes and ultra-structure of chloroplast while ameliorating oxidative stress by enhancing the antioxidative defence system. Analyses of bioaccumulation factor (BAF) and translocation factor (TF) revealed that C. capsularis has potential to perform the phytoextraction of Cu, and the values of BAF and TF in Cu-stressed plants significantly increased under chelator application. EDTA was more effective than CA in increasing phytoextraction potential and improved growth and development in C. capsularis. The results of this study suggest that the co-application of these chelators represents an efficient strategy for improving the phytoextraction of Cu by jute grown in Cu-contaminated soil.

Saudi Journal of Biological Sciences, 2021

Leaf nitrogen (N) concentration plays an important role in biochemical and physiological function... more Leaf nitrogen (N) concentration plays an important role in biochemical and physiological functions, and N availability directly influences rice yield. However, excessive N fertilization is considered to be a root cause of environmental issues and low nitrogen use efficiency. Therefore, the selection of appropriate nutrient management practices and organic amendments is key to maximizing nitrogen uptake and maintaining high and sustainable rice production. Here, we evaluated the effects of different 15 Nlabelled nitrogen sources (urea, ammonium nitrate, and ammonium sulfate at 315 kg ha À1) with or without biochar (30 t ha À1) on paddy soil properties, root growth, leaf gas exchange, N metabolism enzymes, and N uptake in the early and late seasons of 2019. We found significant differences among N fertilizer sources applied with or without biochar (P < 0.05). Across the seasons, the combination of biochar with N fertilizers significantly increased soil organic carbon by 51.21% and nitrogen availability by 27.51% compared with N fertilizers alone. Correlation analysis showed that rice root morphological traits were strongly related to soil chemical properties, and higher root growth was measured in the biochar treatments. Similarly, net leaf photosynthetic rate averaged 9.34% higher, chlorophyll (Chl) a concentration 12.91% higher, and Chl b concentration 10.05% higher in the biochar treatments than in the biocharfree treatments across the seasons. Notably, leaf 15 N concentration was 23.19% higher in the biochar treatments in both seasons. These results illustrated higher activities of N metabolism enzymes such as NR, GS, and GOGAT by an average 23.44%, 11.26% and 18.16% in the biochar treatments across the seasons, respectively. The addition of biochar with synthetic N fertilizers is an ecological nutrient management strategy that can increase N uptake and assimilation by ameliorating soil properties and improving the morpho-physiological factors of rice.

Buletin Agroteknologi, 2020

There is a debate about whether the aged biochar effect can increase the crop yield or not. Herei... more There is a debate about whether the aged biochar effect can increase the crop yield or not. Herein, a field-based experimental data set and analysis provide the information on the aged biochar effect coupled with summer legumes on the yield of subsequent wheat. Briefly, in summer 2016, three different types of legumes i.e. mungbean, sesbania, and cowpea were grown with the intention of grain for human consumption, green manuring for soil fertility improvement, and fodder for livestock consumption. A fallow was also adjusted in the experiment with the purpose of comparison. Biochar was added to each experimental plot in triplicates at the rate of 0, 5, and 10 tons ha-1. After the harvesting of legumes, the biomass of each sesbania treatment plot was mixed in the field while the biomass of mungbean and cowpea were removed from each respective plot. To investigate the aged biochar effect, the wheat crop was grown on the same field layout and design (randomized complete block) of legume...

GCB Bioenergy, 2021

The quality and nutritional status of agricultural soils are depleting gradually, and biochar is ... more The quality and nutritional status of agricultural soils are depleting gradually, and biochar is widely used in soil quality improvement. A sustainable approach of biochar application needs a better understanding of its interaction with nitrogen application and the final effect on crop growth. In our study, the effect of different biochar application levels (0, 15, 30, and 60 tons ha−1) in combination with nitrogen fertilizer levels (0, 150, 300, and 450 kg ha−1) on soil properties, rice growth, and nitrogen use efficiency were investigated. The results showed that sole application of biochar (B60) did not promote the rice growth except the soil organic carbon (SOC), total nitrogen, total phosphorous, and available potassium compared with no biochar addition, while a single application of 450 kg N ha−1 (N450) adversely affected the rice physiological and yield traits by destroying rice leaf ultrastructure and reducing the stomatal length by 13%, stomatal width 3% and density 12%, pl...