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盆栽试验结果表明,ABT生根粉处理玉米种子具有明显的促进生根和加快植株生长的作用。达到最大生长量的80％时所需施肥量(外部磷需求),ABT生根粉处理和对照分别为15和40mgP/100g土、表明ABT生根粉处理明显提高了玉米磷效率。上述外部需求差别与体内需求无关,而主要取决于根/冠和磷吸收速率。在所有供P水平下,ABT生根粉处理的磷吸收速率均大于对照。根/冠在低P处理对照稍高.而后以AST生根粉处理为高。ABT生根粉提高了磷吸收速率,主要是由于纤细根、分枝根多,根毛长和密度大。施磷水平与玉米根系生长有明显相关性。低磷水平下,根/冠比大;地上部磷/地下部磷小;根系纤细根、分枝根多,根半径小,单位长度根的根毛数量多、长度大,这是玉米对低磷的一种适应性调节。
The results of pot experiment showed that ABT rooting treatment of maize seeds obviously promoted rooting and accelerated plant growth. The required amount of fertilizer (external phosphorus requirement) at 80% of maximum growth, ABT rooting meal treatments and controls were 15 and 40 mg P / 100 g soil, respectively, indicating that ABT rooting powder treatment significantly increased maize phosphorus efficiency. The above external demand differences have nothing to do with the needs in the body, but mainly depend on the root / crown and phosphorus absorption rate. At all P levels, phosphorus uptake rates for ABT rooting powder treatment were greater than controls. The root / crown was slightly higher in the low-P treatment, followed by the AST rooting powder treatment. ABT rooting powder increased phosphorus uptake rate, mainly due to slender roots, branching roots, root hair length and density. Phosphorus level and corn root growth have obvious correlation. Under low phosphorus level, the root / shoot ratio was large; the aboveground Phosphorus / underground Phosphorus was small; root slender roots, branched roots and more, the root radius is small, root hair per unit length of the root number and length, A kind of adaptive regulation.