This study examined the correlations between nematode numbers, chemical and physical soil properties, and soybean yield under different cropping systems. The investigation was conducted in 35 commercial soybean fields in northern Paraná, Brazil. Soil and soybean root samples were collected from plants with symptoms of nematode infection at the field borders. Grain yield was determined at the end of the crop cycle. Data were subjected to principal component analysis using MiniTab. Soybean–maize rotation resulted in increased numbers of total nematodes, Pratylenchus, and Meloidogyne. Soybean–sugarcane and soybean–fallow systems had increased Helicotylenchus and Xiphinema numbers and elevated soil manganese levels. Soil chemical properties were correlated with the adoption of conservation practices, such as crop–livestock integration. Pratylenchus number was positively correlated with soil sand content and negatively correlated with soil organic matter content. Soybean yield correlated positively with soil potassium, phosphorus, calcium, magnesium, and organic matter and negatively with soil penetration resistance.

本研究考察了不同种植系统下线虫数量、土壤化学和物理特性以及大豆产量之间的相关性。调查是在巴西巴拉那北部的 35 个商业大豆田中进行的。从田间有线虫感染症状的植物中收集土壤和大豆根样品。在作物周期结束时确定谷物产量。使用 MiniTab 对数据进行主成分分析。大豆-玉米轮作导致总线虫、Pratylenchus和根结线虫数量增加。大豆，甘蔗和大豆休耕系统增加了螺旋线虫和剑线虫数量和土壤锰含量升高。土壤化学性质与采取保护措施有关，例如作物-牲畜整合。Pratylenchus数量与土壤含沙量呈正相关，与土壤有机质含量呈负相关。大豆产量与土壤钾、磷、钙、镁和有机质呈正相关，与土壤渗透阻力呈负相关。