Reprodução de Meloidogyne incognita raça 1 e produtividade de cultivares de ervilha sob diferentes lâminas de água

The objective of this work was to evaluate the effect of six water depths on the reproduction factor and gall index of Meloidogyne incognita race 1 as well as yield of eight pea cultivars in Cerrado conditions of the Federal District, Brazil. Treatments were replicated four times in a completely randomized block design and combined eight pea cultivars (Triofin, Mikado, Marina, Vicosa, Maria, Luiza, Amelia and Kodama) besides six water depths, 479, 395, 311, 239, 177 and 156 mm. There was no interaction between cultivars and water depths for the nematode reproduction factor and gall index, but there was for yield. The means for reproductive factor and gall index per cultivar in the six water depths did not differ, showing that the cultivars presented the same degree of susceptibility. However, the general means of the eight cultivars for each water depth showed that the reproductive factor reduced by 60% in water depths of 156 and 177 mm, indicating that the nematode did not tolerate water deficit. Cultivar yield did not differ, considering water depths of 239 to 395 mm, but it reduced to 12, 30 and 40%, respectively, considering water depths of 479, 177 and 156 mm. Pea cultivars reached the best yield under water depths of 239 to 395 mm.