关键词: 猪血凝性脑脊髓炎病毒, 猪血凝性脑脊髓炎病毒, RT-PCR, 病毒检测

Abstract:

【OBJECTIVE】Effect of different N-fertilizer levels and different N-fertilizer ratio on actual yield and yield components of super hybrid rice was studied 【METHOD】Two field experiment about different N-fertilizer levels and different N-fertilizer ratio were designed through super rice Y liangyou No?1 was experiment material 【RESULTS】 It was significantly secondary correlated between yield, ear length, grain number per panicle and nitrogen application rate (p < 0.01) and linear correlated between panicle number per ha and nitrogen application rate (p<0.05). In the amount 180 kg?hm-2 of nitrogen application, the production was reached 11649 kg?hm-2 and 11624 kg?hm-2 for 60-40 of base-panicle N fertilization and 10-50-25-15 of base-tillering-panicle-granular N fertilization respectively..Rice biomass was increased with N-rate increasing in different period; The effect of biomass promoted by N-rate was especially obviously with the progress of rice growth; Rice biomass change trends were similarly at different stage in different N-rate under same base-panicle (80-20) N-ratio. Yield of super hybrid rice was generally higher when rice biomass increased great in late period. 【CONCLUSION】252 kg?hm-2 was the N fertilizer rate when the yoeld of Y liangyou No. was highest. In the amount 180 kg.hm-2 of nitrogen application, the production was reached 11649 kg.hm-2 and 11624 kg?hm-2 for 60-40 of base-panicle N fertilization and 10-50-25-15 of base-tillering-panicle-granular N fertilization respectively.