Tobacco is an important economic crop in China and fertilization is one of the key technologies of tobacco cultivation system.
烟草是我国一种重要的经济作物，而施肥是烤烟栽培的关键技术之一。
The aef of kwas negative in nk treatment while increased rapidly in npk treatment after10-year crop cultivation; k was also one of critical limited nutrients for crop yield .
k的农学效率在试验进行10年后nk处理平均为负值，同期npk处理中小麦k的农学效率却急剧增加，k成为作物高产的限制因素；
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