近两年来,我们进行了棉花营养钵苗床抽行留苗试验。实践证明,这是一项促进棉花平衡增产的有效措施。其特点是: (一)争得季节,花工少,有利于降低成本。抽行留苗只要在苗床内把移栽的钵子搬走,按规格留下单行钵苗,操作方便、简单易行,比大田移栽省工、省肥料、省成本。 (二)根系发达,没有缓苗期,有利于早苗早发。由于留苗不损伤根系,克服了钵苗移栽时松动钵土,主根截断,侧根受损,移栽后钵体紧密,根系发育不良,缓苗期长,早苗不能早发的缺点。据考察:留苗的侧根系特别发达、粗壮,主根 The past two years, we conducted a cotton seedling nursery bed puddle seedlings test. Practice has proved that this is an effective measure to promote balanced cotton production. Its features are: (A) win the season, spend less, will help reduce costs. As long as the pumping pillars in the seedbed within the transplanted bowl removed, according to the specifications to leave a single row of seedlings, easy to operate, simple, transplanted than the provincial labor, fertilizer, the provincial cost. (B) developed root system, there is no Huanmiao period, early seedling is conducive to early onset. Because the seedlings do not damage the root system, overcoming the shortcomings of loose bowl soil, root truncation, lateral root damage after transplanting, close bowl body after transplanting, poor root development, slow seedling period and early seedling emergence. According to the investigation: Liao Miao lateral root well developed, stout, the main root