论文部分内容阅读
白叶秧苗发生对于培育壮秧极为不利,弄清低温与秧苗白叶发生的关系及其发生过程,对于探明“白苗”产生的原因及采取相应防治措施很有必要。关于低温造成秧苗白叶的有关资料报导颇少。一般认为“白苗”产生是由于秧苗遇到日平均温度12℃以下的持续低温,特别是当水稻秧苗长到2—3叶时胚乳内养分快耗尽,抗寒力削弱,幼苗受冻,叶绿素破坏,叶尖端或全叶变白,但茎与叶鞘仍保持绿色;当天气好转,气温升高时,新抽出的心叶可恢复正常,仍保持绿色。对于上述说法,笔者通过1976年以
The occurrence of white-leafed seedlings is extremely unfavorable to the cultivation of strong-seedlings. It is necessary to clarify the relationship between low-temperature and the occurrence of white leaves of seedlings and the process of their occurrence, so as to find out the causes of “white seedlings” and take appropriate control measures. Low temperature caused by the leaves of white leaves of the relevant information reported quite a few. Generally believed that “white seedlings” is due to the average daily temperature of seedlings encounter 12 ℃ below the sustained low temperature, especially when the rice seedlings grow to 2-3 leaves when the endosperm nutrient exhausted, cold weakened, seedlings frozen, Chlorophyll damage, leaf tips or whole leaves turn white, but the stem and leaf sheaths remain green; when the weather improves, the temperature rises, the newly extracted heart leaves can be returned to normal, still remain green. For the above statement, I passed by 1976