جستجوی مقالات مرتبط با کلیدواژه "علف های هرز انگل" در نشریات گروه "گیاهپزشکی"

To study the effect of type and different nitrogen fertilizers on controlling Egyptian Broomrape، field and greenhouse studies based on randomized complete block with three replications، were conducted at Ferdowsi university of Mashhad. Greenhouse study treatments were consisted of ammonium nitrate، ammonium sulfate and urea each of which applied at four rates (75، 150، 300 and 350 kg/ha). Field experiment treatments were included of ammonium nitrate، ammonium sulfate and urea، applied at three rates (150، 300 and 350 kg/ha). The result of greenhouse studies indicated ammonium nitrate and urea (at all of rates) reduces Orobanch infestation about 80 percent. Ammonium nitrate and urea at (300 kg/ha) were increase tomato dry weight compare to the control. The field study findings too indicated that ammonium nitrate (300 kg/ha) was the most effective treatments in increasing tomato yield and produced highest yield (53 t/ha). Ammonium sulfate strongly decreased tomato biomass plants in greenhouse study but in field conditions produced yield same control. In conclusion we may suggest that applying ammonium nitrate fertilizer could effectively control broomrape in tomato and improve tomato growth and biomass.

In order to study the effect of environmental factors (light, temperature, salinity and drought stress, acidity and burial depth) on germination and emergence of eastern dodder (Cuscuta monogyna Vahl), experiments were conducted at the Research Laboratory of Faculty of Agriculture, Birjand University in 2009. Results showed that seeds of this parasite weed had identical germination under light/dark and continuous dark conditions, indicating this weed species is non-photoblastic. Seeds of this weed species showed average germinability greater than 84% over a wide range of temperatures (10/5, 20/10, 25/15, 30/20 and 35/25 C) at both light/dark and continuous dark regimes and the maximum germinability (98.3%) was observed at 25/15ºC. Eastern dodder could retain its germinability at high salinity levels and even at salinity level of 320 mM NaCl 66.67% of seeds germinated, although its germination was ceased at 640 mM NaCl. Seeds germinated greater than 80% until the drought level of -0.8 MPa, while further increasing of drought stress caused a remarkable reduction of seed germination. This weed seeds showed averagely greater than 90% germination at pH range of 4-10 and seed germination was not notably affected by pH. Seed burial depth had a great impact on eastern dodder seedling emergence, so that no seedling emerged from seeds buried deeper than 3cm and maximum emergence (100%) occurred where seeds placed on the soil surface covered with 2 layers of filter paper. The information of this study would be helpful for estimating the potential of this species to spread to new areas.