Effects of the legume catch crop Serradella on P mobilization and P release in problematic soils in a pot experiment

We identified problematic arable soils in northeastern Germany, which appeared to be characterized not only by severe P supply problems but also by severe P fixation problems. In a small-scale pot experiment, we investigated the influence of the legume catch crop Serradella on the P supply and P release in these soils. Three fertilization intensities (without phosphorus fertilization (P0), 50 kg TSP per hectare (P50) and 100 kg TSP per hectare (P100)) were tested with and without Serradella. Two samplings were performed during the experimental period: an intermediate harvest four weeks after sowing and a harvest eight weeks after sowing. P-mobilization and P-release in the soil were determined by measuring potential enzyme activities, total element concentration, plant-available phosphate concentrations, and dithionite and oxalate soluble element concentrations. Dataset version 1.0我们在德国东北部鉴定出存在问题的耕地土壤，此类土壤不仅存在严重的磷（Phosphorus，P）供应不足问题，还伴随严重的磷固定问题。在一项小型盆栽试验中，我们探究了豆科填闲作物塞拉代拉（Serradella）对这类土壤中磷供应与磷释放的影响。 本试验设置了三种施肥强度处理：无磷施肥组（P0）、每公顷施加50千克重过磷酸钙（Triple Superphosphate，TSP）组（P50）以及每公顷施加100千克重过磷酸钙（TSP）组（P100），每个施肥强度下均设置添加与不添加塞拉代拉两个亚组。 试验周期内共开展两次采样：播种后4周进行中间收获采样，播种后8周进行终采采样。 土壤中的磷活化与磷释放水平通过测定潜在酶活性、元素总浓度、植物有效磷浓度，以及连二亚硫酸盐（dithionite）与草酸盐（oxalate）可溶性元素浓度得以量化。 数据集版本1.0

搜集汇总

背景与挑战

背景概述

该数据集总结了德国东北部问题土壤中豆科覆盖作物Serradella对磷动员和释放影响的盆栽实验研究，通过比较不同施肥强度（无磷肥、50 kg TSP/ha、100 kg TSP/ha）和两次采样时间点，评估了Serradella对磷供应和释放的影响，测量指标包括酶活性、元素浓度和植物可利用磷酸盐等，旨在解决土壤磷供应和固定问题。