Effect of fertilization on the caloric value and morphological properties of Miscanthus floridulus

The effect of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer on the caloric value, ash content and morphological properties of Miscanthus floridulus were studied. The orthogonal design was used to determine the effects of N, P and Kcombinations on caloric value, ash content, plant height, stem diameter, ratio of stem to leaf and yield .The results showed that differences of caloric values in leaf, ash quantity of leaf and stem, plant height, stem diameter among different combinations were significant except the yield. The best fertilizer combination was urea (300 kg/hm2) + superphosphate（600 kg/hm2）+ KCl (50 kg/hm2) and the higher caloric value and lower ash content could be reached. Under the combination of urea (300 kg/hm2) + superphosphate（600 kg/hm2）+ KCl (50 kg/hm2), the better morphological properties could be reached.