Abstract

The goal of this study was to evaluate the influence of phosphate rates on productivity of potatoes tubers of cultivars Atlantic and Ágata. The experiments were carried out in Unaí-MG, Brazil (Ágata and Atlantic) and Mucugê-BA, Brazil (Ágata). The rates of phosphate was 0, 150, 300, 600 and 900 kg ha⁻¹ of P₂O₅. All macro and micronutrient contents increased by increasing P rates in Atlantic-MG. In Ágata-MG, only S was reduced and in Ágata-BA, higher rates of P reduced N, Cu, Mn and Zn contents. Despite this reduction, only Zn was below the range considered suitable for potato. The maximum rates estimated for total yield in Atlantic-MG (38 t ha⁻¹), Ágata-MG (47.6 t ha⁻¹) and Ágata-BA (59.7 t ha⁻¹) were, respectively: 606, 730 and 535 kg ha⁻¹ of P₂O₅. The P response of Ágata-BA was 25.4% lower than Ágata-MG. This can be related to medium clay content and low CEC of Mucugê-BA soils, compared to Unaí-MG soils, which are more clayey and have a higher CEC, consequently, they have a higher P retention capacity. However, rates of P should be oriented based on knowledge of soil attributes and dynamics of its constituents, cultivar requirements and interactions with regional climatic conditions.

摘要

这项研究的目的是评估磷酸盐对大西洋和阿加塔（Agata）马铃薯块茎生产力的影响。实验在巴西的Unaí-MG（阿加塔和大西洋）和巴西的Mucugê-BA（阿加塔）进行。磷酸盐的比率为0、150、300、600和900kg ha ^-1的P ₂ O ₅。通过增加大西洋地区镁的磷含量，所有常量和微量营养素含量均增加。在Ágata-MG中，只有S减少，而在Ágata-BA中，较高的P会减少N，Cu，Mn和Zn的含量。尽管减少了，但是只有锌低于认为适合马铃薯的范围。Atlantic-MG（38 t ha ^-1），Ágata-MG（47.6 t ha ^-1）和Ágata-BA（59.7 t ha ^-1）的最高总产量估算值）分别为：606、730和535 kg ha ^-1的P ₂ O ₅。Ágata-BA的P响应比Ágata-MG低25.4％。与Unaí-MG土壤相比，Mucugê-BA土壤具有中等黏土含量和低CEC，而Unaí-MG土壤具有更多的黏性和更高的CEC，因此它们具有更高的P保持能力。但是，磷的施用率应基于对土壤属性及其组成动态，品种要求以及与区域气候条件的相互作用的了解。