Due to the strong interaction of phosphorus (P) with soil constituents, P fertilizer placement can significantly affect how crops take up this nutrient. Nonetheless, few studies address the spatial distribution of P at the row-interrow scale according to management strategies. In a 16-yr no-tillage (NT) field experiment involving two different P fertilizer application methods (broadcast or band application) and two P sources (triple superphosphate – TSP or reactive Gafsa phosphate rock-RPR), plus a control treatment, the spatial distribution of P fractions was assessed in two occasions: after the 8th and the 16th crops. This was done vertically to a depth of 30 cm and horizontally from the crop row to the center of the interrows. Broadcast treatments showed total and Mehlich-1 P accumulation at the soil surface while for band application this accumulation was in the crop row region. A small P movement down the soil profile was observed from the 8th to the 16th crop with broadcast application, whereas with band fertilizer this effect was more noticeable, showing increased soil volume under P fertilizer influence even without soil tillage; it is likely that this was partly due to biological P turnover and application at depth. After 16 crops, the soil volume under the influence of P fertilizer was greater under band application while the volume above Mehlich-1 P critical levels for the 0–20 cm layer in regional studies was higher under broadcast application, independent of the P source. Soil organic carbon (SOC) contents were not affected by P placement or source. However, a significant accumulation of SOC was seen from the soil surface downwards after the last eight crops. The spatial distribution of P and SOC was better correlated under broadcast treatments, with high values for both variables at the soil surface; this may explain similar yields to those obtained with band application, where P fertilizer is placed near the main roots in an attempt to reduce P adsorption to the soil solid phase.

由于磷 (P) 与土壤成分的强烈相互作用，磷肥的施用会显着影响作物吸收这种养分的方式。尽管如此，很少有研究根据管理策略在行间尺度上解决 P 的空间分布。在一项为期 16 年的免耕 (NT) 田间试验中，该试验涉及两种不同的磷肥施用方法（播撒或带施）和两种磷源（三重过磷酸钙 - TSP 或反应性 Gafsa 磷酸盐岩 - RPR），加上对照处理， P 组分的空间分布在两次评估：第 8 次和第 16 次作物之后。这是垂直完成的，深度为 30 厘米，水平从作物行到中间行的中心。播撒处理显示土壤表面的总磷和 Mehlich-1 P 积累，而对于带状施用，这种积累是在作物行区域。从第 8 季到第 16 季，在播撒施肥的情况下，观察到土壤剖面有少量 P 向下移动，而使用带施肥时，这种影响更为明显，即使没有土壤耕作，在 P 肥影响下土壤体积也会增加；这可能部分是由于生物磷的周转和深度应用。在 16 种作物之后，带施磷肥影响的土壤体积更大，而区域研究中 0-20 cm 层的 Mehlich-1 P 临界水平以上的体积在播撒施肥下更高，与 P 源无关。土壤有机碳 (SOC) 含量不受 P 放置或来源的影响。然而，在最后八种作物之后，从土壤表面向下观察到 SOC 的显着积累。P 和 SOC 的空间分布在播撒处理下具有更好的相关性，土壤表面两个变量的值都很高；这可以解释与带施获得的产量相似的原因，其中磷肥放置在主根附近，以试图减少磷对土壤固相的吸附。