Correlations between nematode numbers, chemical and physical soil properties, and soybean yield under different cropping systems

Correlations Between Pratylenchus and Meloidogyne Populations, Soil Chemical Properties, Soil Texture, and Nutritional Status of Soybean Crops in Paraguay

“…The positive correlation between Pratylenchus and soil pH and the negative correlation between the nematode and OC in sandy soils (Figure 2a) disagree with previous research (Franchini et al, 2014). However, one study also observed a negative relationship between OC and the lesion nematode (Dias-Arieira et al, 2021), suggesting a possible suppressive effect of organic compounds on phytonematodes, in addition to a beneficial effect of OC on the growth of nematode-antagonistic microorganisms. In clay soils, the positive relationship of Pratylenchus with Al 3+ , H + Al, and Al saturation, as well as the negative relationship between the nematode and pH CaCl 2 and pH SMP (Figure 2a), can be attributed to the fact that Pratylenchus populations are generally associated with poor, acidic soils.…”

“…In sandy soils, there was a negative correlation between Pratylenchus and sand content (Figure 3a), and, in clay soils, the nematode was negatively associated with clay content (Figure 3b). Previous research reported a positive relationship between Pratylenchus and sandy soils (Leiva et al, 2020;Dias-Arieira et al, 2021) and clay sandy soils (Gallardo et al, 2015). In fact, studies have shown that sandy soils favor Pratylenchus populations because of the presence of macropores, which improve oxygenation and reduce waterlogging (Leiva et al, 2020).…”

“…Previous studies investigated associations of Pratylenchus and Meloidogyne with soil physical (Galbieri et al, 2016;Noronha et al, 2020;Leiva et al, 2020;Dias-Arieira et al, 2021) and chemical properties (Guzmán, 2008;Leiva et al, 2020;Noronha et al, 2020;Dias-Arieira et al, 2021). Pratylenchus is reported to correlate positively with sandy (Leiva et al, 2020;Dias-Arieira et al, 2021) and clay sandy soils (Gallardo et al, 2015). Findings regarding organic matter and soil pH are not conclusive, with reports of negative (Leiva et al, 2020;Dias-Arieira et al, 2021) and positive correlations between Pratylenchus and organic matter (Franchini et al, 2018;Noronha et al, 2020) as well as negative (Osseni et al, 1997) and positive correlations between the nematode and soil pH (Noronha et al, 2020).…”

“…Assessment of nutrient levels in soybean leaf tissues serves to gain insight into the crop's productive potential (Oliveira Junior et al, 2020). Previous studies investigated associations of Pratylenchus and Meloidogyne with soil physical (Galbieri et al, 2016;Noronha et al, 2020;Leiva et al, 2020;Dias-Arieira et al, 2021) and chemical properties (Guzmán, 2008;Leiva et al, 2020;Noronha et al, 2020;Dias-Arieira et al, 2021). Pratylenchus is reported to correlate positively with sandy (Leiva et al, 2020;Dias-Arieira et al, 2021) and clay sandy soils (Gallardo et al, 2015).…”

“…Pratylenchus is reported to correlate positively with sandy (Leiva et al, 2020;Dias-Arieira et al, 2021) and clay sandy soils (Gallardo et al, 2015). Findings regarding organic matter and soil pH are not conclusive, with reports of negative (Leiva et al, 2020;Dias-Arieira et al, 2021) and positive correlations between Pratylenchus and organic matter (Franchini et al, 2018;Noronha et al, 2020) as well as negative (Osseni et al, 1997) and positive correlations between the nematode and soil pH (Noronha et al, 2020). Meloidogyne is consistently associated with sandy soils (Guzmán et al, 2008;Galbieri et al, 2016;Noronha et al, 2020).…”