Effect of calcium cyanamide and other ammonia fertilizers on Meloidogyne incognita

The nematicidal effect of calcium cyanamide at different dosages was tested on tomato on comparison with urea and ammonium sulphate against Meloidogyne incognita. Calcium cyanamide caused phytotoxicity when applied after transplanting, whereas suppressed nematode population only at rates over 1,000 mg/Kg soil, when distributed before transplanting. Urea and ammonium sulphate were suppressive at all application rates, although phytotoxic at the highest dosages. Fertilizer rates and final nematode population data were related significantly by the linear equation y = a - bx.