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在巴西,曾对可可树进行了一个裂区试验,五次重复,四个处理,即对照,氮、磷、钾配方为12—30—20的混合肥0.5,1.0和1.5,基本用量是每公顷286公斤(合每亩19公斤)。两个亚处理即松土和不松土。结果表明:三种用量的肥料都能促进可可树的生长,从而增产,而用重型硬式锋利中耕机松土的处理却减产。土壤化学分析表明,施肥改变了土壤酸碱度以及镁、特别是磷的含量。
In Brazil, a split-plot experiment was conducted on cacao trees with five replicates and four treatments, ie 0.5, 1.0 and 1.5 for compost with 12-30-20 N, P and K formulations, each at a rate of Hectare 286 kilograms (19 kilograms per acre). Two sub-treatments are loose soil and loose soil. The results showed that all the three kinds of fertilizers promoted the growth of cacao trees and increased the yield, while the treatment with the heavy-duty rigid sharp-cultivator loosening soil decreased production. Soil chemical analysis showed that fertilization changed soil pH and magnesium, especially phosphorus.