Brachiaria enrichment with selenium-coated urea

ABSTRACT: Selenium (Se) fertilization in grazing to biofortification of animal products have been carried out in low Se soils. The objective of this study was to increase the Se content in the biomass of Brachiaria spp.with urea coated with Se. The experiment was performed in a typical Hapludox soil under greenhouse conditions. A completely randomized block design with four replicates in a factorial structure with two cuts and six Se doses (0, 10, 20, 40, 80, and 160gha-1) was used. The Brachiaria brizantha demonstrated the absence of changes in higher harmful doses without modifying the activity of glutathione peroxidase enzyme. We concluded that enrichment of Brachiaria brizantha with coated urea is obtained with 34.5gha-1of Se.

摘要：针对动物产品生物强化的放牧体系硒（Se）施肥技术，已在低硒土壤中得到应用。本研究旨在通过施用硒包膜尿素，提升臂形草属（Brachiaria spp.）生物质的硒含量。实验于温室条件下，在典型弱发育湿润老成土（Hapludox）中开展。试验采用完全随机区组设计，以双刈割与6个硒施用量（0、10、20、40、80和160g·ha⁻¹）构建因子结构，共设置4次重复。研究发现，臂形草（Brachiaria brizantha）在较高有害施硒剂量下未出现生理变化，且谷胱甘肽过氧化物酶（glutathione peroxidase）活性未受影响。本研究得出结论：采用硒包膜尿素对臂形草进行生物强化的最优施硒量为34.5g·ha⁻¹。