Effect Of Split Application Of Nitrogen Fertilizer On Spad Valuse In Hybrid Rice (Grh1).

ABSTRACT: A field trial to effect of split application of nitrogen fertilizer on spad values in hybrid rice(GRH1). Comprising of 2 treatments, nitrogen fertilizer at 100,200 and 300 kg/ha was main plot and split application at 3 levelT1=(1/2basal-1/2mid tillering),T2=(1/3basal-1/3mid tillaring-1/3panicle initation) and T3=(1/4basal-1/4 mid tillering-1/4panicle initation-1/4 flowering) as sub plot. Using randomized complete block design (RCBD) with 3 replication in rice research institute of iran-departy of mazandaran (amol) in 2006 cropping season. The results showed that spad values increased significantly with nitrogen fertilizer. Interesting in comparison to 100 and 200 kg/ha level application of higher N-fertilizer 300 kg/ha showed a positive respond to application of high nitrogen hybrid cultivar. Effects of different split application N-fertilizer were significantly on spad valuse the each times. Study interaction effect of treatments revealed that all the spad valuse increased significantly with an application of 300 kg/ha N-fertilizer at 4 stage. Timing of nitrogen application can apply four or three times at different growth stage based crop need and spad threshold and crop-growing condition at each location . The results revealed that N application method based on growth diagnosis helped in saving N applied fertilizer and increasing grain yield.