Effect Of Nitrogen Fertilizers On Development Of Rice Yellow Mottle Virus (Rymv) And Yield Of Rice (Oryza Sativa L.)

ABSTRACT

Rice Yellow Mottle Virus (RYMV) is the most important pest constraint of rice in Tanzania and other sub Saharan Africa countries. Fertilizer management is recommended to minimize incidence and development of the disease in affected rice ecosystems. Field research was carried out in the 2014 cropping season at Sokoine University of Agriculture to determine the effect of nitrogen fertilizers on the development of RYMV and grain yield of rice. Split-split plot in a randomized complete block design (RCBD) with three replications was adopted. Three RYMV inoculated rice cultivars namely Mwangaza (R), Salama (MR) and Supa (S) were fertilized with four different types of nitrogen fertilizers (DAP, NPK, SA and Urea) each at two levels (100kgN/ha and 120kgN/ha). Urea was applied in split and single dose. Significant differences for area under disease progress curve (AUDPCs) (P