Early Season Growth Responses of Resistant and Susceptible Cotton Genotypes to Reniform Nematode and Soil Potassium Application

A greenhouse study was conducted to investigate the roles that host plant resistance and soil potassium (K) levels play in affecting Rotylenchulus reniformis Linford Oliveira (Tylenchida: Hoplolaimidae) (RN) populations early season cotton (Gossypium hirsutum L.) growth. Two upland, RN-resistant lines (G. barbadense introgressions: 08SS110-NE06.OP 08SS100), a genetic standard (Deltapine 16) commercially available susceptible cultivar (PHY 490 W3FE) were evaluated at four different of K [100% recommended rate, 150% recommended, 50% base level] from seeding until harvesting, 60 days after sowing (DAS). Quadratic functions (r2 = 0.82 0.95) best described growth response genotypes K. The level associated with lowest values for most morphological variables, including height (PH), mainstem nodes (MSN), leaf area, dry weight 30 DAS DAS. However, did not affect RN population counts (RC). Additionally, influence rate change variables among genotypes. resistant genotype showed greater terms time first true leaf, PH, MSN, above-ground weights compared genotype. No interaction between or found RC pots less than Our research on by novel, contributes development improved fertilization management cotton.