Scientists at the agroforestry center say the use of fertilizer trees can reduce the need for chemical nitrogen by up to three-fourths.And they say it can double or triple crop production.

• 农地林业中心的科学家称，使用肥料树木可以将对化学氮素的需求减少四分之三，还可以将土地产量提高两到三倍。