The concentration of metabolic energy in the diet was the main nutrientlimitation, and the second one was quality of pasture;
影响绵羊采食量的主要营养因素是饲粮代谢能浓度，其次是牧草质量。
2
By using soil nutrient state system study method, balancing soil fertilization have been adopted after the soil nutrientlimitation factors had been made clear.
采用土壤养分状况系统研究法。在摸清土壤养分限制因子前提下，平衡施肥。
3
The results showed that crude protein level in the diet was the main nutrientlimitation affecting liveweight gain of grazing sheep, and the dietary metabolic energy level came second.