以减产幅度为标准，在棉花开花期以前热量充足的情况下，后期生长热量指数低于64为一般延迟型冷害年指标，低于61.8为严重延迟型冷害年指标。

Due to output reduction heat index in the later below 64 was usually defined as delay cool damage year and below 61.8 more serious year under the sufficient heat condition before blooming.

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但在一般培养条件下，变异株的呼吸能力、生长量和发酵力与野生型菌株均无明显差异。

While, there are no marked differences of respiratory activity, growth rate and fermentability between the variant end the wild strain in general cultural conditions.

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