落叶松幼苗心止病(早期封顶,简称心止),是幼苗为适应不良环境而形成的独特的生理现象。长期以来,一直被看成是落叶松育苗的一道难关。追究原因常被认为是缺肥缺水所致,采取的措施是加肥加水。然而,心止并未被完全根除。根据十几年的生产体会认为,缺肥缺水固然是引起心止的重要原因,但不是唯一的。 Larch seedling heart disease (early capping, referred to as the heart only), the seedlings to adapt to the adverse environment and the formation of a unique physiological phenomenon. For a long time, has been seen as a larch nursery challenge. Investigate the reasons often considered to be lack of water caused by lack of water, the measure taken is to add fertilizer and water. However, the heart has not been completely eradicated. According to more than 10 years of production experience that, lack of water and lack of water is of course cause an important reason, but not the only.