大麦氮肥用量及运筹效果分析

目的]研究不同氮肥用量及运筹对大麦的影响。方法]不同氮肥用量及运筹试验。结果]不同氮肥用量及运筹对大麦冬前苗情没有明显影响,随着用氮量的增加和基肥比例的提高,拔节期分蘖、次生根、群体总苗数及成熟期有效穗数均显著增加;当氮肥用量增加到270 kg/hm2时千粒重及产量最高,300 kg/hm2时结实粒数最多;基肥与追肥比例6.5∶3.5时结实粒数最多、产量最高,5.5∶4.5时千粒重最高。结论]大面积生产时施氮量以270 kg/hm2,基肥与追肥比例掌握在6.5∶3.5到7.0∶3.0为宜。

Analysis of Nitrogen Fertilizer Dosage of Barley and Its Effect

Objective] The effect of the nitrogen fertilizer on the growth of barley was experimented.Method] The different application amounts and measures of nitrogen fertilizer were tested.Results] There was not the significant impact on barley seedling growth before winter in different application amounts and measures of nitrogen fertilizer.With the increment of nitrogen fertilizer application and the ratio of basal dressing,the number of tiller at jointing stage,the number of secondary root,total number of seedlings in the population and the number of effective panicle at maturity period were raised.When the amount of nitrogen was increased to 270 kg/hm2,the 1 000-grain weight and yield reached to the highest value;and when 300 kg/hm2,the ratio of seed-setting was highest.When the ratio of basal to top dressing was 6.5∶3.5,the ratio of seed-setting and yield of Supi No.3 was highest;and when 5.5∶4.5,the 1000-grain weight had maximum value.Conclusion] The application amount of 270kg N-fertilizer per hm2 and the ratio of basal to top dressing in the range from 6.5∶3.5 to 7.0∶3.0 were appropriate in actual production on a large scale.