铁肥根系输液矫正果树缺铁失绿症机理

Mechanism of iron fertilizer by root-inserted to correcting chlorosis of fruit

邻二氮杂啡铁示踪结果表明 ,铁肥根系输液处理时铁以二价态由根被动吸收 ,并运输到根、茎、和叶的主脉内。运输部位都是靠近形成层的木质部 ,运输速度每小时可达数十厘米。室内营养液培养的八棱海棠苗用59Fe示踪结果表明 ,断根中分配的59Fe为 18.1% ,叶中分配的59Fe占 70 .9% ;断 1、2、3条根的植株59Fe在叶中的分配比例分别为 5 7.9%、6 3.6 %、6 8.0 %。

The trace of red O phenanthroline Fe indicates: Fe 2+ was absorbed by roots and transported to stem, main vein of leaves when iron fertilizer was root inserted.Fe 2+ transports along xylem near cambium. The speed of transportation reached dozens of centimeters per hour. The trace of 59 Fe with Malus micromalus cultured in nutrient solution under the controlled conditions indicate: distribution of 59 Fe in cutting roots and leaves were 18.1% and 70 9%, respectively. The trace of 59 Fe with Malus micromalus indicate: the ratios of iron distributed in leaves by cutting one, two, three roots were 57.9%, 63.6 %and 68.0%, respectively.