فهرست مطالب zahra mohammadiamini

In this research, the pneumatic planter made in karaj Tarashkade company and the driller made in Dezful Sanatkaran company, was compared and evaluated. The independent variables include, the type of planter at two levels (row crop planter and driller), two types of seed bed (smooth bed and plowed land), three ground speed (3, 5 and 7 km/h), 4 seed type (tomato, onion, radish and lettuce). The dependent variables include the seed’s lateral dispersion coefficient compared to the straight line, the seeds breakage percentage and the effect of metering devise on seed breakage and viability and the rate of seed shattering losses per hectare. In this test, a statistical software program MSTATC and split plot based on randomized complete block design with three replications was used. The results showed that: The optimal Index values for the rate of seeding per hectare is obtained was (0.07 kg), seed’s lateral dispersion coefficient in the straight line obtained (2.5 mm), percentage of seeds breakage and effect of the metering device on viability after passing the metering device was (0%). Therefore with respect to the seed’s lateral dispersion coefficient compared to the straight line and the rate of seed shattering losses per hectare index, row crop planter is better than driller. With respect to the seeds breakage percentage index and due to the misalignment of the cell's seed planters, row crop planter had more breakage than driller. With respect to the effect of metering devise on seed viability index, there was no significant difference between the two planters.

In recent years, farmers have shown great interest to using native drill planter rather than complex planters to grow vegetables. In this study, we tested a native planter Independent variables were the two types of substrate surface (asphalt and plowed field), three ground speed (3, 5 and 7 kph) and four types of seeds (tomatoes, onions, radishes and lettuce). Dependent variables were the seed’s lateral dispersion coefficient compared to the straight line, seed shedding rate per unit area. effect Percentage of metering device on seed viability, and breakage percentage of seeds after crossing the metering device. The results showed that, the rate of seed shedding per hectare declines in all seeds along with increasing ground speed. However the lateral dispersion coefficient of the straight line planting has increasing trend along with increasing ground speed and the both parameters are lower in asphalt’s substrate surface than the cultivated ground. breakage percentage of seeds and effect Percentage of metering device on the viability of seeds after passing through the planter are also very low. It assume that use of the planter in front of method of hand cultivation reduce some costs such as costs of seed’s purchase.