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- Author or Editor: M. Selim x
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Sudan grass and pearl millet are major warm season dryland crops, primarily grown for grain production and used as a major source of dietary energy. Both crops are highly water use efficient and belong to the C 4 group of species with high photosynthetic efficiency and dry matter accumulation rates. Both sudan grass and pearl millet have good forage quality, with an adequate crude protein content; that of pearl millet (8.7%) is higher than that of sorghum (6.0%). Therefore, the present investigation was conducted in the Western Delta Region at El-Naubaria, 40 km south of Alexandria, over two successive seasons to evaluate the forage yield and quality of sudan grass and pearl millet. Field experiments were established on calcareous soils, with five fertilization treatments. The results indicate that pearl millet surpassed sudan grass in fresh (6.56 t/ha) and dry yield (2.91 t/ha), which was 8.89% and 5.26% more, respectively, than for sudan grass. As regards the forage quality, pearl millet had good digestibility and was lower in fibre than sudan grass.
Fresh water is considered one of the most important factors in expanding the cultivated area. In arid and semi-arid zones, water resources are scarce. Recently many scientists in different countries have concluded that the re-use of wastewater could help to solve water scarcity problems. An additional target is to protect the environment by reducing the pollution load with little or no risk to the plants, groundwater or human health. Therefore, the principal objective of the present study was to demonstrate the economic aspects of re-using secondary treated wastewater in irrigation, in order to make the best use of existing resources. Thus, field trials were established in a rotation of summer and winter crops during the 2000–2002 seasons to evaluate the effect of irrigation with secondary treated wastewater on the yield and quality of field crops compared with canal water. The present study discusses a part of this study, concerning the effect on the yield and quality of lentils and pearl millet. The experimental treatments for both crops were the same in both growing seasons, involving two water irrigation sources (secondary treated wastewater and canal water) and two fertilization treatments (application of recommended rates of chemical fertilizers and control without fertilizer application). The data demonstrated that crops irrigated with secondary treated wastewater performed equally well or significantly better than those irrigated with canal water. Heavy metal concentrations were very low, and had no influence on crop quality, determined as the chemical composition of lentil seeds and the dry forage yield of millet. Animal performance was also taken into consideration. The results indicated that the seed and biological yields of plants given wastewater in the absence of chemical fertilizers were nearly equal to those of plants given the recommended dose of chemical fertilizers, indicating that wastewater could provide an adequate amount of N, P and K to cover crop requirements at different growth stages.
Abstract
The thermal decompositions of pure and mixed manganese carbonate and ammonium molybdate tetrahydrate in molar ratios of 3:1, 1:1 and1:3 were studied by DTA and TG techniques. The prepared mixed solid samples were calcined in air at 500, 750 or 1000C and then investigated by means of an XRD technique. The results revealed that manganese carbonate decomposed in the range 300–1000C, within termediate formation of MnO2, Mn2O3 andMn3O4. Ammonium molybdate tetrahydrate first lost its water of crystallization on heating, and then decomposed, yielding water and ammonia. At 340C,MoO3 was the final product, which melts at 790C. The thermal treatment of the mixed solids at 500, 750 or 1000C led to solid-solid interactions between the produced oxides, with the formation of manganese molybdate. At 1000C, Mn2O3 and MoO3 were detected, due to the mutual stabilization effect of these oxides at this temperature.
Labour and greenhouse experiments were conducted to study the effect of magnetic field treated water on germination, growth and physiological and biochemical changes in tomato (Lycopersicon esculentum L.), wheat (Triticum aestivum L.) and pea (Pisum sativum L.). The results indicated that magnetic field treated water increased seed germination percentage, seed germination value and seedling vigour index. Magnetic field treated water increased also plant height, leaf area per plant, specific leaf area (SLA), leaf relative water content (LRWC), whereas the leaf water deficit (LWD) values were decreased. Biochemical analysis of the plant leaves irrigated by magnetic field treated water clarified changes in the photosynthetic pigments, UV-absorbing substances (UVAS), activities of peroxidase (POX) and polyphenol oxidase (PPO) enzymes, carbohydrates, phenolics and mineral ion contents. The latter changes are associated with the modifications in the membrane integrity of the plant leaves and the concentrations of some endogenous hormones in the plant shoots.
Abstract
Different Nd-zeolites were prepared from the original NaX and NaY zeolites by ion exchange. The hydrated and thermally activated (at 550 °C) samples obtained were irradiated with 
-rays of 1.5 and 10.0 Mrad. The unirradiated and irradiated samples were characterized mainly by X-ray diffraction and tested for catalytic activity in cumene cracking. The X-ray diffraction patterns indicated a slight decrease of crystallinity after irradiation. However, the irradiated samples exhibited higher catalytic activities than unirradiated ones. -Irradiated hydrated zeolites were found to possess comparable activities, whereas the irradiated dehydrated samples were more active. Higher irradiation doses resulted in more active dehydrated zeolites than those irradiated with a lower dose. The observed higher activity was attributed to the formation of tricoordinate aluminium atoms in the zeolite structure, leading to increase of the number of acidic sites and consequently to a catalytic activity.
