摘要
通采用15N同位素示踪方法,研究我国西南烟区典型红壤、黄壤、水稻土烤烟的氮素吸收规律。结果表明,烤烟氮素的累积与烟叶产量显著正相关,西南烟区烤烟氮适宜需求量为60～100kghm-2。不同土壤类型上种植的烤烟,其氮吸收差异显著,云南红壤烤烟生长前期的氮素吸收速率最高,其次是水稻土烤烟,黄壤烤烟最低;相应氮素吸收高峰分别在移栽后7、9和11周。烤烟中总氮、土壤氮、肥料氮的吸收速率均呈单峰曲线变化,且肥料氮的吸收高峰早于土壤氮;烤烟进入旺长期以后,土壤氮的吸收速率逐渐高于肥料氮,转入以吸收土壤氮为主。西南烟区烤烟打顶前土壤氮的累积比例为59.8%,肥料氮为72.1%,不同土壤类型烤烟打顶前氮素累积比例差异显著,红壤、黄壤、水稻土烤烟分别为87.8%、47.3%和49.2%。因此,根据不同土壤类型烤烟氮素吸收动态,在适宜的氮素需求量下,应以烤烟打顶前氮素需求量和土壤氮素供应量来计算烤烟氮肥需求量。
The aims of this study were to ascertain the difference of nitrogen uptake and verify the absorption law of the nitrogen from soil and fertilizer for tobacco grown in southwest China with red soil, yellow soil, and paddy soil by 15N tracer. The results showed a significant positive correlation between N accumulation amount and yield in flue-cured tobacco, and a suitable nitrogen demand of 60-100 kg haI for tobacco in southwest zone. Absorption dynamics of nitrogen were different for flue-cured tobacco planted in various types of soil. For rate of nitrogen absorption before topping, the highest was for the tobacco planted in red soil, followed by that in paddy soil and the lowest was for that in yellow soil. N uptake peaks of tobacco planted in red soil, paddy soil and yellow soil were peaked in 7 weeks, 9 weeks, and 11 weeks after transplanting respectively. The absorption changes of soil nitrogen and fertilizer nitrogen in tobacco all showed a single peak curve, and the peak of the absorption curves of fertilizer nitro- gen was earlier than soil nitrogen. Uptake rate of soil nitrogen in flue-cured tobacco was gradually higher than fertilizer nitrogen after starting prosperous growth and transferred to the stage of soil nitrogen-dominated absorption. The accumulation ratios of soil nitrogen and fertilizer nitrogen in tobacco before topping accounted 59.8% and 72.1% respectively. The proportions of N accu- mulation before topping were 87.8%, 47.3%, and 49.2% for tobacco grown in red soil, yellow soil and paddy soil respectively. In conclusion, the fertilizer N demand for tobacco should be estimated with N requirement and soil N supply before topping under proper N demand according to nitrogen absorption law.
出处
《作物学报》
CAS
CSCD
北大核心
2013年第3期486-493,共8页
Acta Agronomica Sinica
基金
国家烟草专卖局科技项目(110200601014)资助
关键词
氮素
烤烟
黄壤
红壤
水稻土
Nitrogen
Tobacco （Nicotiana tabacum L.）
Yellow soil
Red soil
Paddy
