| Sowing mechanization technology with watering is an efficient engineering technique for drought-relief and water conservation and plays an important role in dry land farming. In order to overcome the disadvantage of 2BPS-2 plastic film mulch seeder with watering apparatus that the operation speed is limited and the moisture evaporation loss is great, according to the theoretic analysis of water movement in soil, this paper offers another watering project-hidden watering under film, designs three different types of watering devices, meanwhile conducts test research with different watering devices in different position the change of the soil moisture content. On the basis of all these, the paper researches that the soil moisture content reduces slowly after 7 days,so establishes a main criterion of evaluating watering feature-the increment of average soil water content in 7～15 days. According to these theories, we draw an conclusion-water is injected at the position away from seed zone 3.5(cm), 6(cm) deep with vertical flat nozzle, the effect of watering is better at the operation speed of 0.9m/s. All of these will contribute to designing and optimizing the whole machine.
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