众所周知,只有在可从市场上以公道的代价获得推荐的肥料的时候,推荐的施肥措施才能得到实施。现在橡胶局的施肥推荐要用硫酸铵作氮肥源和进口的磷矿粉作磷肥源。目前,这两种肥料都供应不足,而且比较昂贵。但是,作为氮肥源的尿素和作为磷肥源的国产磷 It is a well-known fact that recommended fertilization practices can only be implemented when recommended fertilizers are available on the market at a fair price. Rubber Bureau of the fertilizer is now recommended to use ammonium sulfate as a nitrogen source and imported phosphate rock phosphate source. At present, both types of fertilizers are under-supplied and more expensive. However, urea as a nitrogen source and domestic phosphorus as a phosphate source