估测树木需肥量的新方法美国两名土壤学家研究出一种能可靠测定树木需肥量的新方法，该方是通过测定树根对营养成分的吸收率来测算树木的需肥量，从而使农民能准确地计算出需肥量，具体做法是：每公顷取４０根长度为２０厘米的短树根，用同位素示踪法测量其对营养成分的吸... A new method of estimating the amount of fertilizer required by trees Two soil scientists in the United States have developed a new method that can reliably measure the amount of fertilizer needed by trees to measure the amount of fertilizer needed by the tree’s nutrient uptake , So that farmers can accurately calculate the required amount of fertilizer, the specific approach is: Take 40 per hectare length of 20 cm short roots, using isotope tracer method to measure the absorption of nutrients ...