甜菜是需肥较多的作物。据测定,每生产1吨甜菜块根和相应数量的茎叶,需吸收氮10斤、磷3斤、钾12斤,同时还吸收多种微量元素。甜菜在叶丛繁茂期(生育中期),吸收氮、磷,钾元素分别占全生育期吸收总量的65％、40％和47.5％,这时是追肥的关键时期。但是,由于茎叶繁茂,刨坑、施肥、覆土等作业很不方便,追肥既增加劳动强度、浪费人工,又易碰坏甜菜茎叶,造成减产。 Beet is a fertilizer that needs more fertilizer. It is determined that each production of 1 ton beet root and the corresponding number of stems and leaves need to absorb nitrogen 10 pounds, 3 pounds of phosphorus, potassium 12 pounds, but also absorb a variety of trace elements. Sugar beet is in the leafy period (middle growing stage), absorbing nitrogen, phosphorus and potassium respectively accounting for 65%, 40% and 47.5% of the total growth during the whole growth period. However, due to stems and lush, planing pit, fertilization, casing and other operations is not convenient, dressing not only increases labor intensity, waste of labor, but also easy to damage the beet stems and leaves, resulting in reduced production.