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以速效钾(K2O)含量为112mgL-1的营养液在塿土上进行大田滴灌施肥试验,研究不同滴头流量(2,4,6Lh-1)和灌水施肥量(8,16,24L)条件下水分和速效钾在塿土中的运移、分布情况。结果表明:灌水施肥量为8L时,随滴头流量增大,滴头周围地表积水区半径增大,水分径向运移距离增大、竖向入渗水量减小;随滴头流量增大,速效钾在土壤中的径向运移距离变化不明显,竖向运移距离有减小趋势,距滴头径向30cm范围0～10cm土层土壤速效钾含量增大。滴头流量为2Lh-1时,随灌水施肥量增大,水分和速效钾在土壤中径向和竖向的运移距离增大,径向增大幅度较竖向明显,距滴头径向30cm范围0～30cm土层土壤速效钾含量增大。
Field drip fertilization experiment was conducted on nutrient solution with K2O content of 112 mgL-1 to study the effects of different dripper flow rates (2,4,6Lh-1) and irrigation and fertilization rates (8,16,24L) Under the water and available potassium in the soil in the migration, distribution. The results showed that with the increase of dripper flow rate, the radius of surface water storage area around drippers increased, the radial migration distance of water increased and the vertical infiltration water decreased with the increase of dripper flow rate. There was no significant change in the radial migration distance of the large and quick available potassium in the soil, and the vertical migration distance decreased. The available potassium content in the 0-10 cm soil layer in the radial direction of 30 cm increased. When the dripper flow rate was 2Lh-1, the radial and vertical migration distance of water and available potassium in the soil increased with the increase of irrigation and fertilization, the radial increase range was more obvious than the vertical direction, The available potassium content in 0-30 cm soil layer in 30cm range increased.