Increased nitrogen mitigates growth and yield reduction of UPLRi-5 rice cultivars due to Meloidogyne graminicola.
1994
Gergon E.B. | Prot J.C.
Effects of Meloidogyne graminicola on growth and yield of upland rice cultivar UPLRi-5 were studied under glasshouse experiment. M. graminicola juveniles were inoculated near the base of the plant in five splits at an interval of three days at the rate of 0, 10, 50, 100, 500, and 1000/kg of soil. The levels of nitrogen used were 0, 40, 80, and 160 kg/ha applied in three equal splits 10 days after seeding at maximum tillering and during panicle initiation. Plant height, leaf and shoot weights, leaf area, root weight, depth of rooting and the number of panicles and grains were reduced by the nematodes. Grain yield was reduced by 30-70 percent when the number of infective juveniles present around young seedlings at transplanting (Pi) was greater or equal to 375. Increased nitrogen (N) application increased growth and yield of plants and compensated for yield loss caused by nematodes. However, since yield loss remained approximately constant for a given Pi across the range of N used, N application did not reduce the relative nematode effect.
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