Noneffective tillering period, which contributed more than 50% root growth quantity to the accumulated root growth at heading, was the main period influencing root growth accumulation.

但无效分蘖期根系生长量占抽穗期根系累积量的比例平均值皆在50%以上，是影响抽穗期根系累积量的主要生育阶段。

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Yanshanian period is the main stage for migration and accumulation of oil and gas in this basin.

燕山期是盆地油气运移和聚集的主要时期。

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