甘薯是一种喜温高产作物,没有明显的生育期,一般生长期较长,茎叶较繁茂,块根积累养分多,甘薯的产量也较高。生产实践证明,适时早插是甘薯增产的重要措施之一。其原因是:第一,适时早插,延长了生长期,增加了养分积累。甘薯块根为一 Sweet potato is a hi-temperature high-yielding crop, there is no obvious growth period, the general growth period is longer, the stems and leaves more lush, root tuber accumulation of nutrients, sweet potato yield is also higher. Production practice has proved that timely insertion is one of the important measures to increase sweet potato production. The reason is: First, timely insertion early, extending the growth period, an increase of nutrient accumulation. Sweet potato root is one