Abstract: Maize or Corn (Zea mays L.) is the most important cereal in the world after wheat and rice. It possesses high nutritive value and is important as a coarse grain. In Sri Lanka, this crop has cultivated, around 30,000ha and local consumption is around 200,000mt annually. Further, Maize is an easily grown crop and the cultivation has been popular among farmers as a cost effective crop with limited fertilizers. This Crop earns a reasonable foreign exchange as it is used as infant foods. Maize has a higher leafy mass and higher vegetative growth within shorter period of time than the other monoculture crops.