effects of nitrogen rates and application method on grain yield and yield
نویسندگان
چکیده
proper application of n fertilizer and its optimization for increasing the economic yield of rice is definitely important. in order to determine the best n application method and amount according to growth stages of hybrid rice, an experiment was carried out at experimental farm of rrii in a factorial experiment based on a randomized complete block design with 3 replications. the treatments included 6 application methods as follow: total nitrogen at transplanting stage ,50% at transplanting stage +50% at early tillering , 50% at transplanting stage +50% at panicle initiation , 50% at transplanting stage +25% at maximum tillering +25% at booting ,34% at transplanting stage + 33% at early tillering + 33% at booting and 70% at transplanting + 30% at panicle initiation. 3 levels of nitrogen (90,120 and 150 kg/ha) from urea source were also used. recorded traits were grain yield and yield component. results showed the significant interactions between split methods and n rates on yield, flag leaf area, filled and unfilled grain number per panicle and percentage fertility (p <0.01). by increasing n yield, number of panicle per m -2, flag leaf area, percentage of fertility, grain protein and total rice recovery have increased. the highest grain yield was 7978 kg/ha-1 relevant to treatment of 50% n at transplanting stage + 25% at maximum tillering +25% at booting plus applying 150 kg net nitrogen per hectare.
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عنوان ژورنال:
پژوهش های زراعی ایرانجلد ۹، شماره ۴، صفحات ۷۲۸-۰
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