Iowa state university horticulture specialist cindy haynes suggests planting the seeds one and one - quarter centimeters deep . they should be planted in rows that are spaced thirty to forty - six centimeters apart 爱荷华州立大学园艺专家辛迪海恩思建议种植甜菜籽1又1 / 4厘米的深度。种植行距空间为30 ? 46厘米。
