v< 



MAIZE 



CHAP, distance of the surface: second, that deep cultivation while the 



IV. 



Fig. ig. — Part of a transverse section of a maize stem, showing mass of pith, 

 with scattered vascular bundles, more numerous near the stem-wall. (From 

 Cavers' Practical Botany, W. B. Clive.) 



plants are growing is likely to prune off the surface-roots and 

 thus reduce the absorptive power of the plant ; third, that 



PROTOPHLOEM 

 SIEVE TUBES 

 COMPANION CELLS 



LARGE PITTED 

 VESSELS 



SMALL PITTED 

 VESSELS 



SPIRAL AND 



ANNULAR VESSELS 



XYLEM PARENCHYMA 



LYSIGENOUS CAVITY 

 SCLERENCHYMA 



Fig. 20. — Transverse section of vascular bundle of maize. (From Cavers' 

 Practical Botany, W. B. Clive.) 



surface-rooting weeds interfere with the supply of moisture 

 and plant-food required by the maize crop. 



