جستجوی مقالات مرتبط با کلیدواژه "polymer" در نشریات گروه "منابع طبیعی"

The use of various types of polymers in the field of seed processing (coating seeds of various types of plants) has become very important in recent years. Polymer materials are used to add a mixture of fungicides and pesticides and growth regulators to help protect plant seedlings from growing and deploying better against pathogens and harmful insects in the early stages of plant growth. This research was carried out with the aim of making internal polymer and its feasibility study in seed of three sugar beet, corn and alfalfa crops during the years of 2014-2015. In order to compare the effect of foreign and internal polymer, seed quality, germination, abnormality percentage, Radicle length in laboratory and Seed vigor in greenhouse were evaluated. The results of the obtained spectra and surface tension the comparison of the polymer prepared with the foreign polymer used as a control. It can be concluded that the internalized polymer is physically and mechanically similar to that of an external polymer. Application of polymer in sugar beet cover had no adverse effect on germination and seed establishment. The results of this study showed that the synthesized internal polymer in this study can be used to coating the seeds of sugar beet and alfalfa and 1% and 1.5% for corn seeds in order to achieve optimum seed coating and not to have an adverse effect on their qualitative traits.

In order to evaluate the seed and essential oil yield and harvest index of cumin, a factorial experiment based on randomized complete blocks design was conducted with three replications, at the research farm of the faculty of agriculture of Urmia University in 2010. Treatments were four irrigation regimes (irrigation after 50, 100, 150 and 200 mm of evaporation from a class A pan) and different amounts of superabsorbent polymer (0, 60, 120, 180, 240 and 300 kg/ha). The highest biomass yield (3640 kg/ha), seed yield (1226 kg/ha) and essential oil (36.5 kg/ha) belonged to irrigation after 50 mm of evaporation and 60 kg/ha superabsorbent polymer application. Increasing in irrigation distances to 100, 150 and 200 mm of evaporation needs to 180 and 120 kg/ha polymer to produce maximum yield (biomass and seed), but they were 60 and 300 kg/ha polymer for essential oil yield and harvest index, respectively. The maximum harvest index of seed for irrigation after 100, 150 and 200 mm of evaporation belonged to 180 kg/ha superabsorbent treatment. Application of superabsorbent at irrigation after 50 mm of evaporation (non-stress condition) does not have efficiency for essential oil production compared with the control (without polymer in this irrigation). In conclusion, increasing irrigation intervals from 50 to 200 mm of evaporation from pan lead to reduce the yield (biomass, seed and essential oil), that application of superabsorbent polymer A200 compensate part of this reduction.

The present study was designed to evaluate the effect of seed coating on Monogerm beet seed viability and development by using four different polymers in 2013in Research Institute for Improvement of Sugar Beet Seed. The experiment was conducted on the basis ofa completely randomized design with four replications. Monopolymer (MP), Copolymer (CP), Homopolymer hard (HPS) and soft Homopolymer (HPS), each at a concentration of, 1, 5, and 10 % with control (uncoated) were compared. The recorded traits included germination immediately after coverage, after one month of coverage, growth power after three months of coverage, fresh weight, dry weight, number of buds, shoot length, root length, and growth power of seed in the field. The results showed that there were significant differences among treatments in terms of all traits. According to the results, both soft and hard Homopolymer hay were relatively superior in terms of most recorded traits. However, with respect to percent germination percentage in the field which is of great importance, Monopolymer 10% with Homopolymer hard and soft at low concentrations (to 5%) exhibited a good performance.