油菜叶色的变化是营养元素对其生长发育影响的外在表现。在生产实践中，人们常以油菜叶色变化为依据，采取相应的补救措施。1．红色油菜红叶多发生在长柄叶和短两叶上，一般由外向内扩展，从全株看，较老的叶子先红，依次出现在新叶上。就一片叶子而言，通常是叶子边缘先规紫色 Changes in the leaf color of rape is an external manifestation of the impact of nutrients on its growth and development. In the practice of production, people often take the change of the leaf color of rape as the basis, and take corresponding remedial measures. 1. Red rape red leaves occurred in the long leaves and short two leaves, generally extended from the outside to the inside, from the whole plant, the older leaves first red, followed by the emergence of a new leaf. In the case of a leaf, it is usually purple on the edge of the leaf