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

摘要: 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 57.9%、63.6 %、68.0 %。

Abstract: The trace of red O-phenanthroline Fe indicates: Fe2+ was absorbed by roots and transported to stem, main vein of leaves when iron fertilizer was root inserted.Fe2+ transports along xylem near cambium. The speed of transportation reached dozens of centimeters per hour. The trace of 59Fe with Malus micromalus cultured in nutrient solution under the controlled conditions indicate: distribution of 59Fe in cutting roots and leaves were 18.1% and 70 9%, respectively. The trace of 59Fe 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.