ABSTRACT
Maize is one of the most important cereal crops in the world agricultural economy both as food for man and feed animal. It has very high yield potential, there is no cereal on the earth which has so immense potentiality and that is why it is called “queen of cereals”. Improving the resolution of maize leaf photosynthesis measurements in the field may help to clarify the relationships between environmental stress, carbon assimilation and grain yield. When chlorophyll fluorescence parameters are used to estimate photosyhthetic rates of maize leaves, an accurate estimate of leave absorptance of incident PPFD is required. Transpiration water calculated for unit weigh of absorbed nitrogen, and nitrogen uptake calculated for unit transpired water. Sowing data had different effects on dry matter accumulation in the vegetative and reproductive growth stages. Sowing date had different effects on changes in and on mean values of the growth indices in the vegetative and reproductive growth.
