ABSTRACT

Nutrient leaf application is complementary to soybean nutritional management, mainly at maturity, when plants present high nutritional demand and high nutrients and photoassimilate translocation rates for seed production. The aim of this research was to evaluate the agronomic performance, physiological quality, and nutritional contents of soybean seeds after application of different rates (0, 0.50, 1.0, 1.5, 2.0, and 2.5 kg ha⁻¹) of foliar fertiliser containing calcium (20%) and boron (4%) at the R3 stage (onset of pod formation). This research was carried out in two sites (Guaragi and Floresta) both in Parana State, Brazil, in randomised complete blocks with 4 replicates. Calcium and boron leaf application increased grain sulphur and nitrogen levels (Guaragi) but reduced phosphorus and magnesium (Floresta). Regarding physiological quality, foliar fertilisation increased the index of germination speed. The yield and number of pods increased up to the rate of 0.6 and 1.2 kg ha⁻¹ of leaf fertiliser in Floresta. Foliar fertilisation with calcium and boron showed advantages, however, results depended on the site, indicating different levels of soil fertility and climatic characteristics.

摘要

营养叶的施用是大豆营养管理的补充，主要是在成熟时，此时植物表现出较高的营养需求，较高的养分和光吸收水平，从而促进了种子生产。本研究的目的是评估施用不同比例（0、0.50、1.0、1.5、2.0和2.5 kg ha ^-1的大豆种子的农艺性能，生理品质和营养含量））在R3阶段（豆荚开始形成）含有钙（20％）和硼（4％）的叶面肥料。这项研究是在巴西帕拉纳州的两个地点（瓜拉吉和弗洛雷斯塔）中进行的，有四个重复的随机完整块。钙和硼叶的施用增加了谷物的硫和氮含量（瓜拉吉），但减少了磷和镁（Floresta）。关于生理质量，叶面施肥提高了发芽速度指标。弗洛雷斯塔（Floresta）的豆荚产量和荚果数量增加到叶肥的0.6和1.2 kg ha ^-1。用钙和硼进行叶面施肥显示出优势，但是结果取决于地点，表明土壤肥力和气候特征不同。