STUDIES ON THE EFFECT OF RICE NODAL ROOTS OVER THE GROUND ON LATE GROWTH OF RICE BY ~(32)P AND 14C Effects of water and phosphorus supply on morphology and structure of special root hairs on nodal roots of wheat (Triticum aestivum L.) Formation, morphology, and structure of special root hairs on nodal roots of winter wheat (Triticum aestivum L.) in middle and late growing period