Effect of crop rotation and straw application in combination with mineral nitrogen fertilization on soil carbon sequestration in the Thyrow long-term experiment Thy_D5,Plant and Soil

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Effect of crop rotation and straw application in combination with mineral nitrogen fertilization on soil carbon sequestration in the Thyrow long-term experiment Thy_D5
Plant and Soil ( IF 3.9 ) Pub Date : 2022-05-03 , DOI: 10.1007/s11104-022-05459-5
Bärbel Kroschewski ₁ , Christel Richter ₁ , Timo Kautz ₁ , Michael Baumecker ₂

Affiliation

Aims

The aim of study was to quantify the temporal change of soil organic carbon content in relation to agricultural management for a dry sandy arable soil and to derive the C sequestration potential.

Methods

We analyzed data from a long-term field experiment with three crop rotations of different cereal proportions, with two levels of straw application (removal/return) in combination with four mineral nitrogen rates (40 … 160 kg ha^-1 yr^-1). Treatments are arranged in a two-factorial block design with two replicates for each rotation. During the 24-year study period, grain and straw yield of two cereal test crops and soil organic carbon content in topsoil were determined annually from each plot.

Results

Soil organic carbon content was positively influenced by removing non-cereal crops from the rotation and – to a smaller extent – by straw application. Increasing mineral N-fertilization from 40 kg ha^-1 yr^-1 to higher rates increased grain yield of rye but not barley, increased straw yield of both cereals more, with no effect of higher straw yields on soil organic carbon content.

Conclusions

Despite the overall soil organic carbon content of the sandy soil under study is comparatively low, the results indicate that agricultural management has a relevant impact on soil carbon stocks. Straw return contributes to carbon sequestration even in rotations with a low potential for reproduction of organic matter. High mineral N-fertilization is not an adequate measure to sequester carbon in these soils.

中文翻译：

Thyrow长期试验Thy_D5轮作和秸秆施用联合矿质氮肥对土壤固碳的影响

目标

研究的目的是量化与干燥沙质耕地的农业管理相关的土壤有机碳含量的时间变化，并推导出碳封存潜力。

方法

我们分析了一项长期田间试验的数据，该试验采用三种不同谷物比例的作物轮作，两种水平的秸秆施用（去除/返回）结合四种矿物氮率（40 … 160 kg ha ^-1 yr ^-1）。处理以双因子区组设计排列，每次旋转有两个重复。在 24 年的研究期间，每年从每个地块测定两种谷物试验作物的谷物和秸秆产量以及表土中的土壤有机碳含量。