在巴西尤纳试验站的橡胶苗圃,为了测定氮磷钾肥不同用量对胶苗生长的效应,进行了一个肥料试验。试验设计为5×5×5:5的超希腊拉丁法,每小区24株。氮磷钾各分5种用量,每种用量每公顷分别相差50、40和30公斤。为了测定施石灰的效应,除了氮磷钾处理小区中的两个外,其余全都加施白云石质石灰岩。结果表明,磷和钾肥都能促进胶苗生长, At a rubber nursery at the Yuna pilot station in Brazil, a fertilizer test was conducted to determine the effect of varying amounts of NPK fertilizers on the growth of the vaccine. The experimental design was a 5 × 5 × 5: 5 ultra-Greek Latin method, 24 per cell. N, P and K each divided by 5 kinds of dosage, each dosage was 50, 40 and 30 kg per hectare respectively. To determine the effect of lime, dolomitic limestones were all applied except for two of the N, P and K treatment plots. The results showed that both phosphorus and potassium fertilizers can promote the seedling growth,