Abstract
Abstract: The objective of this study was to evaluate the physiological potential of stylosanthes seeds cv. Campo Grande in response to coating with zinc and boron. The treatments were: T1 - uncoated seeds; T2 - seeds coated with calcium silicate; T3 - 80 g of B + 60 g of Zn.kg-1 seeds; T4 - 120 g of B + 90 g of Zn.kg-1 seeds; T5 - 160 g of B + 120 g of Zn.kg-1 of seed and; T6 - 200 g of B + 150 g of Zn.kg-1 of seed. The seeds were evaluated by germination test, speed index and mean time of germination (GSI and MGT), seedlings emergence test, speed index and mean emergence time (ESI and MET), shoot and root length (SL and RL), leaf area (LA), number of nodes (NN) and shoot and root fresh (SFW and RFW) and dry weight (SDW and RDW). Coating reduced the germination and seed vigor. Micronutrients favored plants development, after its establishment. The coating with 120 g of B + 90 g de Zn.kg-1 of seed favors the growth, development and nodulation of the plants.
Highlights
In Brazil, the most practical and economical way of livestock support are the pastures
The treatments influenced the physiological quality of seeds of cv. estilosantes Campo Grande (Table 1)
The treatments involving the covering of seeds, regardless of the addition of Zn and B, exerted negative impact on the first count of germination (FGC)
Summary
In Brazil, the most practical and economical way of livestock support are the pastures. The results obtained with the production of dry mass are inferior to the genetic potential of the forage species, limiting the productive potential of the cattle industry (Victor et al, 2009), due to, in particular, the deficiency in fertilizer management. The use of techniques aimed at improving this management emerges as viable alternatives to ensure the sustainability of the pastures cultivated by combining productivity, quality and persistence of forage production (Teles et al, 2011). Boron and zinc are worth highlighting, since they are the ones that most often cause disabilities in crops in soils of the Tropics (Faquin, 2005). Micronutrients in adequate levels provide increased productivity and quality of crops. Appropriate levels of micronutrients can still encourage the efficient use of fertilizers containing nitrogen and phosphorus (Kirkby and Römheld, 2007). Boron and zinc are characterized by being absorbed in small quantities, due to the fact that they don’t participate in plant structures, but they are constituents of enzymes or act as its enablers (Dechen and Nachtigall, 2006)
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