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1.
Mimi Suliza Muhamad Nuramidah Hamidon Mohd Razman Salim Zulkifli Yusop Woei Jye Lau Tony Hadibarata 《Water, air, and soil pollution》2018,229(7):222
In this work, the effects of various operating parameters (pressure, pH, BPA concentration, and filtration time) toward bisphenol A (BPA) removal via ultrafiltration (UF) membrane system were investigated using response surface methodology (RSM). Historical data design of RSM was used to obtain the interaction between variables and response as well as optimizing the process. The analysis of variance (ANOVA) showed that the third-order polynomial model was significant in which pH and filtration time were identified as significant terms that influence BPA removal. The 3D response surface plots revealed the two-factor interaction between independent and dependent variables. The optimization process of the model predicted optimum conditions of 99.61% BPA removal at 1 bar, pH 6.7, 10 μg/L BPA concentration, and 10-min filtration time. The predicted optimum conditions for BPA removal were consistent with the obtained experimental values, indicating reliable application of historical data design RSM for modeling BPA removal in UF membrane system. 相似文献
2.
Mehdi Karimizarchi Amin Soltangheisi Aminuddin Husin Mohd Khanif Yusop Radziah Othman 《Journal of plant nutrition》2018,41(14):1798-1806
A glasshouse experiment was conducted to elucidate the influence of elemental sulfur (S) application rates (0, 0.5, 1.0, and 2.0 g S kg?1 soil) on the release and uptake of S at 0, 20, and 40 days after incubation. Results showed that there was a progressive upward trend in maize leaves, stem, and root S content with application of elemental S. However, maize production followed a nonlinear model. Plants grown in untreated soils suffer from S deficiency and addition of elemental S at a rate of 0.5 g S kg?1 soil alleviated S deficiency. The decrease in maize performance due to the highest S application rate was not related to S toxicity. The greatest leave, stem, and root productions were obtained at S concentrations of 0.41, 0.58, and 0.2%, respectively. Overall, application of elemental S at a rate of 0.5 g S kg?1 soil is recommended for maize performance improvement. 相似文献
3.
Batoul Samedani Abdul Shukor Juraimi Md. Parvez Anwar Mohd Yusop Rafii Sheikh Abdullah Sheikh Awadz Abudul Rahim Anuar 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(7):571-582
Abstract Asystasia gangetica and Pennisetum polystachion are the most troublesome weeds in oil palm plantations in Malaysia and establishment of cover crops under oil palms is an integral part of sustainable weed management in plantations. Replacement-series experiments were conducted to evaluate the mode and strength of competitiveness of four legume cover crop species, Calopogonium caeruleum, Centrosema pubescens, Mucuna bracteata and Pueraria javanica, and one soft grass species, Axonopus compressus, against Asystasia gangetica and Pennisetum polystachion. Relative yield, relative yield total and relative crowding coefficient were calculated with reference to shoot biomass. Asystasia gangetica was a consistently weaker competitor than Pennisetum polystachion. The legume cover crop species had higher relative yield when grown in mixtures, whereas the yield of Asystasia gangetica was lower in mixtures with legumes than in monoculture. The higher competitiveness of legumes was due to greater canopy height and leaf area index. Centrosema pubescens was a slightly weaker competitor than the other legumes. Although leaf area per plant of Centrosema pubescens did not differ from that of other three legumes, canopy height and blocking photosynthetically active radiation to the soil surface were lower. When grown with a cover crop for 12 weeks, dry weight per plant, leaf area and shoot number of Pennisetum polystachion increased as its proportion decreased in mixtures. Relative yield data indicated that Pennisetum polystachion is a strong competitor. Axonopus compressus was less susceptible to Pennisetum polystachion interference than the legumes. All cover crop species studied proved highly competitive against Asystasia gangetica, but none could compete against Pennisetum polystachion. The study confirms the feasibility of using a cover crop for management of Asystasia gangetica. 相似文献
4.
Nur Mahfuzah Noor Affendi Mohd Khanif Yusop Radziah Othman 《Communications in Soil Science and Plant Analysis》2018,49(11):1394-1400
A field experiment was conducted to study the effects of coated urea with urease inhibitor [copper (Cu) and zinc (Zn)], nitrification inhibitor (DMPP), biochar and geopolymer on ammonium, nitrate, Cu, Zn content and crop yield of maize. The treatments were composed of urea alone (control), urea coated Cu and Zn (UCuZn), urea coated with Cu, Zn, and DMPP (UCuZnDMPP), urea impregnated with biochar (Ubio) and urea coated with geopolymer (Ug2). Data showed that treatments with Cu, Zn, and DMPP produced lower ammonium (NH4) and nitrate (NO3) in UCuZn and UCuZnDMPP while they had the highest concentration of Cu and Zn in soil and plant tissues. Plots treated with UCuZn and UCuZnDMPP produced maximum N concentrations in grains and yield, with increases by 79.5% and 74.1%, respectively, as compared with urea (control). This finding demonstrates that by slow down the hydrolysis and nitrification process using urease and nitrification inhibitor were beneficial to increased N uptake, ultimately produced higher yield. 相似文献
5.
Nitrogen(N) use efficiency is usually less than 50%, and it remains a major problem in rice cultivation. Controlled release fertilizer(CRF) technology is one of the well-known efforts to overcome this problem. The efficiency of CRF, however, is very much dependent on the timing of nutrient release. This study was conducted to determine the precise time of N uptake by rice as a guideline to develop efficient CRF. Fertilizer N uptake by rice at different growth stages was investigated by using 15 N isotopic technique. Rice was planted in pots, with 15 N urea as N source at the rate of 120 kg/hm2. Potassium and phosphorus were applied at the same rate of 50 kg/hm2. Standard agronomic practices were employed throughout the growing periods. Rice plants were harvested every two weeks until maturation at the 14 th week and analyzed for total N and 15 N content. Nitrogen derived from fertilizer was calculated. Total N uptake in plants consistently increased until the 11 th week. After that, it started to plateau and finally declined. Moreover, N utilization by rice plants peaked at 50%, which occurred during the 11 th week after transplanting. N derived from fertilizer in rice plants were in the range of 18.7% to 40.0% in all plant tissues. The remaining N was derived from soil. Based on this study, N release from CRF should complete by the 11 th week after planting to ensure the maximum fertilizer N uptake by rice plants. Efficient CRF should contribute to higher N derived from fertilizer which also resulted in a higher total N uptake by rice plants, increasing the potential of rice to produce higher yield while at the same time of reducing loss. 相似文献
6.
Shoji Noguchi Abdul Rahim Nik Zulkifli Yusop Makoto Tani Toshiaki Sammori 《Journal of Forest Research》1997,2(3):125-132
Field observations were conducted at Bukit Tarek Experimental Watershed in Peninsular Malaysia to investigate the relationship
between rainfall-runoff responses and variation in soil moisture in a tropical rain forest. Stormflow depended strongly on
the antecedent wetness as represented by the initial runoff rate. Though heavy rains fell in almost every month, the soil
moisture decreased when fair weather was sustained. The soil moisture depleted and became dry at 160 cm depth during occasional
dry spells. During dry conditions, streamflow responded quickly to rain events but declined rapidly after the rain stopped,
and the soil moisture of surface soil (≤20 cm) increased but remained dry at lower depths (≽80 cm). This suggests that the
rain water was mostly retained in the soil and only small proportions appeared as stormflow. As soil moisture conditions became
wetter, the recession limb of the storm hydrograph was more gradual. Stormflow volume increased with increasing soil moisture.
During wet conditions, the soil profile was moist at all parts of the slope. The hydraulic gradient was around 1.0 and there
was downward soil water flux, which followed the pressure gradient. This suggests that subsurface flow from the upper part
of the slope might also be important for stream-flow production. Positive pressures were observed at 10 cm and 160 cm depths
during large storms. The behavior of the subsurface flow might be an important determinant of stormflow. 相似文献
7.
Benalywa Zineb Abdulaker Ismail Mohd Mansor Shamsudin Mad Nasir Yusop Zulkornain 《Tropical animal health and production》2019,51(2):321-327
Tropical Animal Health and Production - Broiler meat is the largest and cheapest protein source in Malaysia. Using the policy analysis matrix (PAM), this study examines the comparative advantage of... 相似文献
8.
Jose Álvaro Rodríguez Cristancho Mohamed Musa Hanafi Syed Rastan Syed Omar Yusop Mohd Rafii Fernando Munévar Martínez Carlos Enrique Castilla Campos 《Journal of plant nutrition》2013,36(3):387-401
Aluminum (Al) toxicity is an important factor in limiting crop production. The present study examined the Al alleviation effects on the growth of hybrid (breeding) and clonal (tissue culture) of D × P oil palm seedlings. The experiment was performed using calcium carbonate (CaCO3), and ground magnesium limestone (GML) and magnesium carbonate (MgCO3) as soil-amendments at different rates in Colombia and Malaysia, respectively. The effects of the treatments were evaluated monthly on vegetative variables and visual symptoms. Chlorophyll concentrations were recorded in Malaysia at the fifth month growing stage. The different amendments improved the soil fertility and it was reflected on better performance of shoot and root growth. The chlorophyll content in the frond number 3 for both materials enhanced significantly when Al saturation was low (0–30%). The results from the experiment revealed the importance of neutralization of Al in reducing its toxicity in oil palm. 相似文献
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