Relationship between Nematodes and some Soil Properties in the Rhizosphere of Banana Plants
2021
Al-Ghamdi, Amal Ahmed Mohammed
Nematodes are plant-parasitic organisms that cause alterations in the chemical and physical environment of soils. This study investigates the relationship between nematode occurrence and some soil parameters. The results showed that the proportion of nematodes in soil was negatively correlated with soil pH (r<sup>2</sup>= 0.89); however, it increased with increasing electrical conductivity (EC) (r<sup>2</sup> = 0.95), soil moisture (SM) (r<sup>2 </sup>= 0.60), and organic matter (OM) content (r<sup>2</sup>= 0.78). A positive correlation was found between the proportion of nematodes in the roots and the amount of coarse sand, while a negative correlation existed between the proportion of nematodes and the amount of fine sand, clay, and silt. The degree of colonization by nematodes increased with increasing coarse sand content (r<sup>2</sup>= 0.91). Conversely, the soil nematode population decreased with increasing fine sand content (r<sup>2</sup>= 0.83), clay (r<sup>2</sup>= 0.80), and silt content (r<sup>2</sup>= 0.97). The nematode population in banana roots correlated with soil phosphorus (r<sup>2 </sup>= 0.88), potassium (r<sup>2</sup> = 69), calcium (r<sup>2</sup> = 0.78), and magnesium levels (r<sup>2</sup>=0.78). Conversely, a negative correlation was found between nitrogen concentration and the nematode population in banana roots (r<sup>2</sup>=0.76). Overall, the population of nematodes in soil affects its pH, EC, SM, and OM content.
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