Effect of temperature and moisture on the dormancy and activation pattern of Oxalis latifolia bulbs
نویسندگان
چکیده
The effect of temperature and moisture on the activation of two forms of Oxalis latifolia Kunth bulbs —common and Cornwall— was studied. Gaining knowledge about the conditions needed for their activation may contribute to the control of this weed. Bulbs were kept in a refrigerator at +4°C for 13, 20, 27, 41, 48 and 55 days. At each sampling date, three sets of 30 bulbs of both forms were transferred from 4°C to 21°C; 15 were kept under dry conditions and 15 under wet conditions. For both forms, and under both wet and dry conditions, activation occurred over a prolonged period of time. Dry bulbs were activated earlier than the wet bulbs, and the common form was activated earlier than the Cornwall form. Two different patterns of activation behavior were observed: dry bulbs of the common form usually followed a logarithmic activation pattern, while those subjected to the wet treatment were activated in a linear fashion. Bulbs of the Cornwall form were activated exponentially in the majority of cases. The mean time required for activation after cold storage was constant in the common form, while in the Cornwall form, activation was faster the longer the period of cold storage the bulbs had been previously subject to. Additional key words: biology of weeds, cold, Cornwall form, fishtail oxalis, humidity, warmth.
منابع مشابه
Effects of scarification and stratification on seed germination and dormancy of turgenia latifolia, cuscuta SP and sophora alopecuroides in different temperature regimes
متن کامل
Survey on the treatment of the seed amount, the transplanting time of black zira (Bunium persicum) bulbs from nursery to field with the best cultivation pattern
The present study was conducted at Khorassan Agricultural Research Center in order to determine the amount of seeds in nursery and the best transplanting date for black zira (Bunium persicum) bulbs from nursery to field and to find out the best cultivation pattern in the field. Treatments consisted of six seed rates (20, 60, 100, 180 and 220 kg/ha) which were sown on November 1996. Results reve...
متن کاملSurvey on the treatment of the seed amount, the transplanting time of black zira (Bunium persicum) bulbs from nursery to field with the best cultivation pattern
The present study was conducted at Khorassan Agricultural Research Center in order to determine the amount of seeds in nursery and the best transplanting date for black zira (Bunium persicum) bulbs from nursery to field and to find out the best cultivation pattern in the field. Treatments consisted of six seed rates (20, 60, 100, 180 and 220 kg/ha) which were sown on November 1996. Results reve...
متن کاملModelling leaf development in Oxalis latifolia
This study was carried to develop functions that could explain the growth of Oxalis latifolia, in both early stages and throughout the season, contributing to the improvement of its cultural control. Bulbs of the Cornwall form of O. latifolia were buried at 1 and 8 cm in March 1999 and 2000. Samples were destructive at f ixed times, and at each time the corresponding BBCH scale codes as well as...
متن کاملEffect of Air Velocity and Temperature on Energy and Effective Moisture Diffusivity for Russian Olive (Elaeagnusan gastifolial L.) in Thin-Layer Drying
Thin layer drying of Russian olive (Elaeagnusan gastifolial L.) fruit using a hot air dryer in order to calculate effective moisture diffusivity, activation energy and energy consumption has been evaluated in this article. The selected variables included three levels of air velocity of 0.5, 1 and 1.5 m/s and three air temperature levels of 50, 60 and 70°C. Increased air temperature...
متن کامل