No-tillage can improve soil quality but can also increase the stratification of soil chemical parameters. Nutrient uptake by crops might be limited when nutrients are stratified, especially in semi-arid or Mediterranean regions. To reduce stratification, infrequent tillage could be considered. However, there is a paucity of information on the effects of long-term infrequent tillage on the stratification of soil chemical parameters. This study aimed to assess the effects of long-term infrequent tillage on the stratification of selected soil chemical parameters to a depth of 300 mm. The research was conducted on a long-term (42 years) research site at Langgewens Research Farm in South Africa. Seven tillage treatments were investigated: continuous mouldboard ploughing to a depth of 200 mm, tine-tillage to 150 mm, shallow tine-tillage to 75 mm, no-tillage, shallow tine-tillage every second year in rotation with no-tillage, shallow tine-tillage every third year in rotation with no-tillage and shallow tine-tillage every fourth year in rotation with no-tillage. Tillage treatments had differential effects on the distribution of soil chemical parameters. The mouldboard plough prevented stratification of most soil chemical parameters, such as soil acidity, soil organic carbon (SOC), extractable P, exchangeable Ca and Mg and cation exchange capacity (CEC). However, mouldboard ploughing also led to significantly lower SOC stocks and extractable P stocks. The SOC stocks and extractable P stocks of the no-tillage treatment were not significantly different from those of the infrequent tillage treatments. Overall, the infrequent tillage treatments were no better (P > 0.05) than the no-tillage treatment as infrequent tillage could not effectively ameliorate the stratification of most soil chemical parameters and did not increase the stocks and stratification ratios of SOC and extractable P.

免耕可以改善土壤质量，但也可以增加土壤化学参数的分层。当营养成分分层时，尤其是在半干旱或地中海地区，作物的养分吸收可能会受到限制。为了减少分层，可以考虑不频繁耕作。但是，很少有关于长期不耕作对土壤化学参数分层影响的信息。这项研究旨在评估长期不耕作对所选土壤化学参数分层至300 mm深度的影响。该研究是在南非Langgewens研究农场的一个长期（42年）研究现场进行的。研究了七种耕作方法：连续翻板至200毫米的深度耕作，深耕至150毫米耕作，浅耕至75毫米耕作，每隔两年轮换免耕免耕，免耕，每隔三年轮流免耕浅耕，免耕，每隔四年轮流浅耕，免耕。耕作处理对土壤化学参数的分布有不同的影响。犁板犁防止了大多数土壤化学参数的分层，例如土壤酸度，土壤有机碳（SOC），可提取的P，可交换的Ca和Mg和阳离子交换容量（CEC）。但是，翻板翻耕还导致SOC存量和可提取P存量大大减少。免耕处理的SOC储量和可提取的P储量与不频繁耕作的SOC储量和可提取的P储量没有显着差异。总体而言，不频繁的耕作处理并没有更好的效果（P> 0。