Abstract

The knowledge of the behavior of the coffee tree regarding the combination of nutrients in the soil is important, once it allows to verify the interaction between them, allowing to improve the use efficiency of nutrients by the plants. The objective of this study was to verify the effect of combined doses of N and P on the content of nutrients, dry matter and nutritional efficiency of conilon coffee seedlings in a controlled environment. The assay was carried out in a completely randomized design, with 13 fertilization levels combined with N and P, initially based on the recommendation for studies in a controlled environment, with a sample space of 29.28 to 170.71 mg/dm³ N and 43.93 to 256.06 mg/dm³ P, with three replications. At 150 days of cultivation, the nutritional contents of leaf tissues were measured, as well as dry matter production, content of nutrients in root, shoot and total dry matter; mathematical expressions related to absorption, translocation and use efficiency were applied to study nutritional efficiency. The combination with different levels of N and P in fertilization interferes with the nutrition of Coffea canephora seedlings; the combinations 60.71-43.93 mg/dm³ and 158.92-150.00 mg/dm³ of N and P are an alternative for use in the cultivation of conilon coffee, since these combinations enabled a more efficient use of nitrogen and phosphate fertilizers.

摘要

了解咖啡树关于土壤中养分组合的行为很重要，一旦它允许验证它们之间的相互作用，就可以提高植物对养分的利用效率。本研究的目的是验证在受控环境下，N 和 P 联合剂量对 conilon 咖啡幼苗的养分含量、干物质和营养效率的影响。该测定以完全随机设计进行，13 种施肥水平与 N 和 P 结合，最初基于在受控环境中进行研究的建议，样本空间为 29.28 至 170.71 mg/dm ³ N 和 43.93 至 256.06毫克/分米³P，三个重复。培养150天时，测定叶片组织的营养成分，以及干物质产量、根、地上部养分含量和总干物质含量；应用与吸收、易位和利用效率相关的数学表达式来研究营养效率。施肥中不同水平的N、P结合干扰了咖啡豆幼苗的营养；N 和 P的组合 60.71-43.93 mg/dm ³和 158.92-150.00 mg/dm ³是用于种植 conilon 咖啡的替代方案，因为这些组合能够更有效地使用氮肥和磷肥。