新法测定树木需肥量黄海美国农业专家最近研究出一种测定树木需肥量的新方法，测定速度快、准确性高。其具体做法是：在每公顷范围内选取４０根长度为２０厘米的短树根，用同位素示踪仪测量其对营养成分的吸收率。由于树根是树木吸收养分的主要途径，因此用此法比目前的其... New method to determine the amount of trees required for fertilizer Yellow Sea US agricultural experts recently developed a new method for determining the amount of trees required fertilizer, determination of speed, high accuracy. The specific approach is: Select 40 per hectare short roots of 20 cm in length, using an isotope tracer to measure the absorption of nutrients. As the root of trees is the main way for trees to absorb nutrients, so using this method than the current ...