在严重干旱的 1999～ 2 0 0 0年 ,采用 3个品种 ,3个追肥量 ,3个追肥时期和 3次重复的完全组合设计 ,对大运河以东黑龙港低平原区高产田小麦春季追氮时期和追氮量进行了系统研究。结果表明 :春季追肥时期宜晚 ,第一次肥水在 4叶 1心到 5叶 1心期为好 ,追肥量以尿素 75kg/hm2 为高限 ,甚至可以考虑不追肥。 During the period of severe drought from 1999 to 2000, the complete combination design of three varieties, three topdressing amounts, three top-dressing stages and three replications was used to study the spring chase of high yield wheat in the lowland plain of Heilonggang in the east of the Grand Canal Nitrogen period and nitrogen rate were systematically studied. The results showed that: the spring top dressing should be late, the first fertilizer in the 4 leaf 1 heart to 5 leaf 1 heart period as well, topdressing urea 75kg / hm2 for the high limit, or even consider not topdressing.