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Relative tillering rate(RTR)increased linear-ly with the increasing of leaf N concentration(NLV)has been already reported.To testwhether this relationship could be used toquantitatively explain the difference in tilleringamong a wide range of N application,field ex- periments were conducted at the IRRI farm,Los Banos,Laguna,the Philippines.Two in- dica cultivars,IR 72 and IR68284H wereused.For each cultivar,12 treatments includ- ing 4 N levels(0,60,120,and 180kgN·ha~(-1))and 3 transplanting spacing(30×20,20×20,and 10×20cm)were arranged in a ran-domized split-plot design with 4 replications.The N treatments were designated as mainplots and spacings as subplots.Fourteen-day-old seedlings were transplanted with 3seedlings per hill.The subplot area was 20m~2.Nitrogen fertilizer was applied as basal,atmidtillering,and at panicle initiation in threeequal splits.P,K,and Zn were applied asbasal at normal dosage.The field was flooded.Plant samples were taken every 7-14 d from 14d after transplanting to flower
Relative tillering rate (RTR) increased linear-ly with the increasing of leaf N concentration (NLV) has been reported. To testwhether this relationship could be used to quite quantify explain the difference in tilleringamong a wide range of N application, field ex- periments were conducted at the IRRI farm, Los Banos, Laguna, the Philippines. Two in- dica cultivars, IR 72 and IR68284H were used. For each cultivar, 12 treatments includ- ing 4 N levels (0, 60, 120, and 180 kgN.ha- 1)) and 3 transplanting spacing (30 × 20, 20 × 20, and 10 × 20 cm) were arranged in a ran-domized split-plot design with 4 replications. The N treatments were designed as main plots and spacings as subplots. Courtourt- day-old seedlings were transplanted with 3seedlings per hill. The subplot area was 20m ~ 2. Nitrogen fertilization was applied as basal, atmidtillering, and at panicle initiation in threeequal splits. P, K, and Zn were applied asbasal at normal dosage. Field was flooded. Plant samples were taken every 7-14 days from 14d after tran splanting to flower