Result shows that fertilization have significant accelerating effects on its DBH,tree height,yield,and grade of timber.
在杨树林带中进行同价值不同种类肥料施肥试验,对其林带生长历时13年跟踪调查,试验结果表明,施肥对其胸径、树高生长有明显的促进作用,收获量及木材等级明显提高,其经济效益十分显著。
The poverty status of Henan farmers in the Qing Dynasty is short of quantificational analysis longly,but without any other income source,the net cereals harvest is an index which can reflect this status and can be quantified.
在没有其他经济来源的情况下,粮食净收获量是一个反映清代河南农民贫困状况的可以量化的指标。