Seasonal variation in biomass yield and quality ofTithonia diversifoliaatdifferent cutting heights

Abstract

The objective of this research was to evaluate and compare the yieldperformance and quality ofTithonia diversifoliaforage under different harvestingheights, during the dry and rainy seasons in tropical Mexico.The treatmentsconsisted of three harvest heights 40, 60 and 80 cm from the ground level, cut every60 days, during two seasons of the year. In each period, the biomass was harvestedand separated into edible and non-edible components. We determined the biomassyield, and the concentration of crude protein (CP), neutral detergent fibre (NDF),acid detergent fibre (ADF), lignin, ash and organic matter (OM) of the forage.Cutting at 80 cm height yielded the highest forage biomass per harvest (2 008 kgDM ha−1) while there were no significant differences in forage yield between 40 and60 cm heights. The differences in cutting heights also affected the nutrient qualityof the animal edible forage because the concentrations of CP, ADF and NDF variedsignificantly. There was a significant interaction between cutting heights and theseason on forage production and quality. In the dry season, the content of NDF,FDA, lignin and ash were higher, while the PC and OM were lower. The use ofT.diversifoliaas a forage plant and cutting it to a height of 80 cm is recommended tomaintain the best production and the quality of the forage throughout the year forlivestock production.