【摘要】 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。更多还原

【Abstract】 Irrigation water containing 112 mg L-1 available K was used for dripping fertigation.Distributions of water and available K in Lou soil were investigated under the conditions of different dripping end rates(2,4,6 L h-1) and fertigation volumes(8,16,24 L).The results were as follows.As fertigation volume was 8 L and dripping end rates increased,the radius of surface water catchment around tip increased,the water transferred further horizontally and vertical penetration volume of water dropped;while horizontal diffusion distance of available K in soil changed inconspicuously,the diffusion distance of available K in vertical direction decreased,and available K at 0-10cm soil layer within the range of 0-30 cm from the drop end increased.As dripping end rate was 2 L h-1,dripped water and available K transportation in the horizontal and vertical directions both increased with irrigation volume;and the increase of available K in horizontal direction was more obvious than in vertical direction.Within the range of 0-30 cm from drop point,available K increased significantly at the layer of 0-30 cm.更多还原