Puteri E. Megat Wahab | UPM - Universiti Putra Malaysia (original) (raw)

Papers by Puteri E. Megat Wahab

Journal of Ecological Engineering, 2021

This study was conducted over a period of 52 days to determine the effects of fish stocking densi... more This study was conducted over a period of 52 days to determine the effects of fish stocking density on the water quality, growth performance of tilapia and yield of butterhead lettuce cultivated in decoupled recirculation aquaponic systems (DRAPS). In this study, three respective tilapia stocking densities (treatments) of 8 kg•m-3 , 10 kg•m-3 , and 12 kg•m-3 were used to evaluate the butterhead lettuce in the DRAPS, which consist of two independent loops. All treatments were done in triplicates. The results showed with increased stocking density, the electrical conductivity, total dissolved substances and salinity increased and dissolved oxygen decline. The results showed that the highest stocking density produced the highest nutrients accumulation of ammonia-nitrogen (NH 3-N), ammonium (NH 4), nitrite-nitrogen (NO 2-N) and nitrate-nitrogen (NO 3-N) and potassium (K) except for phosphorus (P). Nevertheless, based on the conversion of fish feed to NO 3-N and P per kilogram of feeds, the lowest stocking density provided the highest concentration of NO 3-N and P. It was documented that DRAPS relied solely on the fish waste produced an insufficient concentration of N, P, K and iron. The average survival rate of tilapia in all treatments was above 94% and was not a significant difference among the treatments.

Ecological Engineering & Environmental Technology, Nov 1, 2021

This study was conducted over 52 days to evaluate the potential of using the nutrient solution pr... more This study was conducted over 52 days to evaluate the potential of using the nutrient solution produced from different fish stocking densities on the yield and nutrients leaf content of lettuce cultivated in decoupled recirculation aquaponic systems (DRAPS). In this study, three stocking densities of tilapia were used 8, 10 and 12 kg m-3, respectively. The result showed the highest total yield 448 g m-2 was obtained at a low stocking density. Also, it has been showing that with an increased fish stocking density, the leaf nutrient content of butterhead lettuce for potassium, calcium, magnesium, sodium, iron and copper was increased. While for the nitrogen, phosphorus and manganese, the higher leaf content was obtained at lower stocking density. Considering the lettuce yield, leaf nutrient contents and nitrogen dynamics, the stocking density of 8 kg m⁻³ could be suggested as the ideal stocking density for DRAPS.

Sustainability, 2021

The study investigated the green and chemical approaches for the preparation of Zn nanoparticles ... more The study investigated the green and chemical approaches for the preparation of Zn nanoparticles and their effect on the growth of okra plants under saline conditions. The leaf extract of Sorghum bicolor L. was used for the green synthesis of zinc nanoparticles (Zn-GNPs). Zinc nanoparticles (Zn-NPs) were also produced by the co-precipitation method (Zn-CNPs). The synthesized NPs were characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) and were applied foliarly in the range of 0.1%, 0.2%, 0.3% on okra plants. A marked increase in the shoot and root fresh and dry weight (g) and chlorophyll contents were observed under normal and saline conditions. An increase in antioxidant activity was observed under saline conditions. However, the foliar application of 0.3% Zn-GNPs was helpful in the regulation of the antioxidant defense system under a saline environment. Based on the results, it can be concluded that the use of Zn-GNP...

Molecules (Basel, Switzerland), Jan 26, 2018

Recently, the quality-by-design concept has been widely implemented in the optimization of pharma... more Recently, the quality-by-design concept has been widely implemented in the optimization of pharmaceutical processes to improve batch-to-batch consistency. As flavonoid compounds in pigmented rice bran may provide natural antioxidants, extraction of flavonoid components from red and brown rice bran was optimized using central composite design (CCD) and response surface methodology (RSM). Among the solvents tested, ethanol was most efficient for extracting flavonoids from rice bran. The examined parameters were temperature, solvent percentage, extraction time, and solvent-to-solid ratio. The highest total flavonoid content (TFC) in red rice bran was predicted as 958.14 mg quercetin equivalents (QE)/100 g dry matter (DM) at 58.5 °C, 71.5% (/), 36.2 min, and 7.94 mL/g, respectively, whereas the highest TFC in brown rice bran was predicted as 782.52 mg QE/100 g DM at 56.7 °C, 74.4% (/), 36.9 min, and 7.18 mL/g, respectively. Verification experiment results under these optimized condition...

Journal of Plant Nutrition, 2016

The growth of the greenhouse chili industry is rapidly increasing in the world including Malaysia... more The growth of the greenhouse chili industry is rapidly increasing in the world including Malaysia. Currently, compost is the most popular growing media. Four fertilizer formulations commonly used by farmers (Local), including the recommended Cooper, Bennoit and Cooper Modified formulation, were evaluated in combination with two volumes (400 and 750 L) for enhancement fruit yield of chili in soilless culture. The results indicate that, the day of blooming and fruiting was reduced by 91% and 50% in media containing coconut dust (CD) + empty fruit bunch (EFB) compared with CD alone. Yield with CD+EFB was increased 36% compared with CD while volume of water shows insignificant difference. Interestingly, Cooper, Local and Cooper Modified formulation enhanced 32, 28 and 19% of yield, respectively. As conclusion, combination of CD+EFB with Cooper, Local and Cooper Modified were more efficient in yield production compared with CD alone for future research.

Open Journal of Water Pollution and Treatment, 2014

The effects of water availability on growth, water relations and related plant leaves characteris... more The effects of water availability on growth, water relations and related plant leaves characteristics of young Tongkat Ali (Eurycoma longifolia jack) plants were investigated. Plant vegetative growth was inhibited with reduced water availability. Leaf water potential and relative water content were reduced with increasing soil water stress. The total leaf area and specific leaf area (SLA) in Tongkat Ali decreased in response to the stress treatments especially from moderate stress (75%FC), to severe stress (25% FC), compared with the control. Therefore by decreasing the SLA plant can preserve the internal water led to increase the tolerance of plant in case of water deficit condition.

Industrial Crops and Products, 2013

Physic nut, Jatropha curcas L. is an important bio-fuel crop. The present study was conducted to ... more Physic nut, Jatropha curcas L. is an important bio-fuel crop. The present study was conducted to determine the extent of genetic variation and relationship among 48 J. curcas accessions of from Malaysia using 14 morphological traits during 2009-2010. In respect of all traits, there were highly significant differences among the accessions. The phenotypic coefficient of variation was the highest for oil yield per ha followed by total no. of seed per plant and seed yield. Similarly, the genotypic coefficient of variation was the highest for seed yield followed by oil yield per ha and total number of seeds per plant. Broad sense heritability was high in general and exceeded 63.5% for all the traits studied. The percentages of genetic advance was higher (>70%) for total number of seeds per plant and seed yield. Morphological traits viz. total number of seeds per plant, total number of branches per plant, number of primary branches per plant and seed yields per ha exhibited a high genotypic coefficient of variation, heritability and genetic advance. Seed yield was significantly (p≤ 0.05) and positively correlated with plant height, total branches, leaf greenish, total number of seeds, number of fruits and oil yield. Based on UPGMA cluster and principal component analyses, the accessions, D-01-09 and B-03-02 (grouped into a single cluster) had above average seed yield, oil yield, number of fruits, total number of seeds, leaf greenish, plant height and primary branch compared to other accessions. For the improvement of J. curcas, two accessions (D-01-09 and B-03-02) could be used as parents and required to be hybridized with the accessions (

A sum of 59 accessions of physic nut, Jatropha curas were collected from different locations of S... more A sum of 59 accessions of physic nut, Jatropha curas were collected from different locations of Selangor, Kelantan and Terengganu states of Malaysia to assess genetic diversity using multivariate analysis and DIVA-geographic information system (GIS). Six quantitative characters, seed length, seed width, fruit length, fruit width, 100 seed weight and oil content were recorded. Based on 6 quantitative characters, 59 accessions were grouped into three clusters at a coefficient level of 3.7. Highly positive correlations were found between fruit length and fruit width, fruit length and seed length, fruit width and seed length, fruit length and seed width, fruit width and seed width and seed length and seed width. DIVA-GIS showed the highest diversity index for 100 seed weight in the J. curcas accessions which were collected from the central parts of Selangor state. On the other hand, the highest diversity index for oil content was observed in the accessions of northern parts and costal region of Terengganu state, followed by the central parts of Selangor state in Malaysia.

Journal of Food Agriculture and Environment

Bulgarian Journal of Agricultural Science, 2018

Al-Tawaha, A. R., Al-Karaki, G., Al-Tawaha, A. R., Sirajuddin, S. N., Makhadmeh, I., Wahab, P. E.... more Al-Tawaha, A. R., Al-Karaki, G., Al-Tawaha, A. R., Sirajuddin, S. N., Makhadmeh, I., Wahab, P. E. M., Youssef, R. A., Al Sultan, W. & Massadeh, A. (2018). Effect of water fl ow rate on quantity and quality of lettuce (Lactuca sativa L.) in nutrient fi lm technique (NFT) under hydroponics conditions. Bulgarian Journal of Agricultural Science, 24(5), 793–800 In the study of hydroponics, questions have risen concerning about ideal water fl ow that allow the plant to absorbing highest amount of nutrient from the nutrient solution during irrigating process. Thus, this experiment was aimed to determine the ideal water fl ow rate in nutrient fi lm technique system in order to optimize the nutrients uptake with growth of lettuce. Different fl ow rates 10, 20 and 30 L/hour were assigned as T1, T2 and T3, respectively, with lettuce plants and the space between plants 15 cm. Generally, the growth decreased signifi cantly with increasing in water fl ow rate. The analysis of lettuce hydroponics ...

* Significant relationship (p<0.05) ** Significant relationship (p<0.01) Conclusion Drainage caus... more * Significant relationship (p<0.05) ** Significant relationship (p<0.01) Conclusion Drainage caused the leaching of Ca and Mg while the N and P levels were the same in all these sites. Leaching of P and K were influenced by rainfall.

NPK (15-15-15) 1.5 115 ± 14.36 d 18 ± 2.19 bc 1.84 ± 0.15 0.17 ± 0.01 h 0.28 ± 0.00 i 2.5 136 ± 9... more NPK (15-15-15) 1.5 115 ± 14.36 d 18 ± 2.19 bc 1.84 ± 0.15 0.17 ± 0.01 h 0.28 ± 0.00 i 2.5 136 ± 9.79 c 19 ± 1.12 abc 1.86 ± 0.21 0.37 ± 0.01 b 0.67 ± 0.00 b 3.5 168 ± 16.98 b 19 ± 2.76 abc 1.90 ± 0.07 0.36 ± 0.01 b 0.47 ± 0.00 f Bioorganic fertilizer (5-5-5) 1.5 82 ± 9.73 e 16 ± 1.88 cd 1.88 ± 0.11 0.51 ± 0.01 a 0.65 ± 0.00 c 2.5 104 ± 5.59 d 17 ± 1.77 bcd 1.86 ± 0.17 0.33 ± 0.01 c 0.37 ± 0.00 g 3.5 111 ± 15.01 d 17 ± 2.19 bcd 1.88 ± 0.08 0.30 ± 0.01 d 0.47 ± 0.02 f Mushroom Medium Residue 1.5 217 ± 19.88 a 21 ± 3.67 ab 1.76 ± 0.09 0.34 ± 0.01 c 0.75 ± 0.01 a 2.5 212 ± 17.99 a 20 ± 2.88 ab 1.72 ± 0.04 0.27 ± 0.01 e 0.50 ± 0.01 e 3.5 218 ± 12.65 a 22 ± 1.85 a 1.76 ± 0.15 0.20 ± 0.00 g 0.29 ± 0.00 h Sig. 0.000 0.001 0.432 0.000 0.000 Means followed by different letters in the same column are significantly different at p<0.05 (Duncan's multiple range test).

A study was conducted to investigate the growth performance, physiological changes and yield qual... more A study was conducted to investigate the growth performance, physiological changes and yield quality of sweet basil (Ocimum basilicum) to inoculation by different rate (0, 10, 20 and 30g inoculums) of Arbuscular Mycorrhizal Fungi (AMF) under the soilless culture system. The result showed that plant height, total leaf area, plant fresh and dry weight, root shoot ratio, total chlorophyll content, photosynthetic rate, stomatal conductance, total ethanol soluble carbohydrate and leaf ascorbic acid were significantly influenced by AMF. Oil production increased significantly with increasing the inoculums rate on both fresh and dry weights of basil. Spore counts and percentage of root colonization were not significantly affected by AMF inoculation.

In recent years, the recirculating aquaponics system has gained high attention and significant po... more In recent years, the recirculating aquaponics system has gained high attention and significant popularity for organic vegetables and fruits production which contributes to the sustainable aquaculture for tropical regions. This review aims to summarize the possibility for practicing intercropping in aquaponics to produce high-quality fruits, vegetables and fish without any chemical fertilizer and minimum ecological impact for a sustainable agriculture. Although many studies have addressed about aquaponics for producing high-value crops such as tomato, cucumber, and lettuce, there is still a lack of complete information to support the development of intercropping in aquaponics and limited focus on its commercial implementation. Moreover, this study will focus first on the requirements for inserting intercropping in aquaponics and technical improvements needed to adapt as potential for sustainable food production system to increase productivity around the world, especially in countries have deficiency in water and land resources as well as soil problem like salinity and reduce environmental emissions. Secondly, the insertion of intercropping in aquaponics must be for crops with high value and for crops that can complement together such as tomato with basil and tomato with lettuce. Thirdly, in technical improvement in this study will summarize the strategies and factors that affect the intercropping in aquaponics system such as the nutrients needed for crops under intercropping aquaponics, stocking density and feeding rate which are important to know the concentration of ammonia that is produced and converted to nitrate so that the plants can uptake it. Studying the requirements for inserting and improving intercropping in aquaponics will increase our understanding of needed for new agriculture technique that contributes to the sustainable aquaponics for tropical regions.

Irrigation frequency is one of the most important factors in the management of water in the agric... more Irrigation frequency is one of the most important factors in the management of water in the agriculture sector to sustain crop
productivity, especially in arid and semi-arid regions of the world. Additionally, fertilizers have to be adequately applied. An
experiment was carried out under a rain shelter from July to December 2012 in Malaysia to determine the effects of irrigation
frequency and fertilizer sources on the growth and yield of sweet corn planted on a limed sandy clay, Ultisol, using a drip-irrigation
system. This experiment was conducted using a split-plot design with four drip-irrigation frequencies (daily, once every 2 days, once
every 3 days and once every 4 days) and four sources of fertilizers (NPK, goat manure, poultry manure and control). The drip
irrigation was the main plot, while fertilizers were the subplot factors. The results of the study indicated that total dry matter and
yield components increased with the increase in drip-irrigation frequency with values of 44% and 32% respectively. The highest
growth parameters and shoot dry weight were recorded from daily irrigation intervals with goat manure, while the highest yield
components were obtained from daily irrigation frequency with NPK fertilizer and poultry manure. In the light of these results,
therefore, for optimum biomass of corn, high irrigation frequency with goat and poultry manure is the most viable option while yield
was greatly favoured by a high irrigation frequency with NPK.
Keywords: Drip irrigation; Goat manure; Inorganic fertilizer; Poultry manure; Sweet corn; Ultisols.
Abbreviations: DAS_Days after sowing; GM_Goat manure; GML_Ground magnesium limestone; PM_Poultry manure.

Application of adequate fertilizers becomes one of the most important agronomic practices to sust... more Application of adequate fertilizers becomes one of the most important agronomic practices to sustain corn production on soils of the tropical regions, which are mostly acidic and poor in nutrients. An experiment under rain shelter was conducted at the Faculty of Agriculture, Universiti Putra Malaysia, Serdang to evaluate the influence of different NPK fertilizer rates on the biomass and yield components of sweet corn. The experiment was carried out using split plot design with four replications. Three drip irrigation frequencies as a main plot: [Once in 2 days (Ir1), once in 3 days (Ir2) and once in 4 days irrigations (Ir3)] and four NPK fertilizer rates as sub-plot [0:0:0 (0%), 60:30:45 (50%), 120:60:90 (100%) and 180:90:135 (150%), henceforth referred to as F1, F2, F3 and F4, respectively] were tested in this experiment. The results of the study showed that total dry matter significantly (P<0.05) increased with increase in the irrigation frequencies. For Ir1 treatments at F4 fertilizer rate, the shoot dry weight was higher compared to the other fertilizer rates due to better nutrient supply to the plant. Similarly, irrigation frequency and fertilizer levels significantly (P<0.05) influenced the yield components. Ear, cob and grain were found to have higher weight for once in 2 days irrigation frequency with fertilizer level of F4. When fertilizer rate was increased from 100% (F3) to 150% (F4), ear, cob and grain weight were increased by 25%, 39% and 23%, respectively.
Key words: drip irrigation, fertilizer rates, Sweet corn, water stress, Ultisol