Abstract
ABSTRACT The study aimed to evaluate different sowing densities and row spacings on grain yield and biomass in the white lupine crop, cv. ‘Comum’. The experimental design was a randomized block in a 4 x 4 factorial scheme, with four row spacings (20, 40, 60 and 80 cm) and four sowing densities in the row (10, 15, 20 and 25 plants m-1), with four replicates. The evaluated variables were: grain yield, hundred-grain weight, fresh and dry matter and the contents of nitrogen, phosphorus and potassium in the plant tissue. The highest grain yield was obtained with row spacing of 20 cm, regardless of plant density. The density of 25 plants m-1 and row spacing of 20 cm increased the fresh and dry matter yield. The adjustment of plant density and row spacing did not affect the content of nitrogen, phosphorus and potassium in plant tissue.
Highlights
Lupinus albus L. has been pointed as an important alternative for the recovery of degraded soils (Rovedder & Eltz, 2008; Rovedder et al, 2010) and as an option in the form of soil cover in crop rotation systems (Bevilacqua et al, 2008; Lázaro et al, 2013; Cargnelutti Filho et al, 2014)
A joint analysis used and the results were considered for both sites (Box, 1954) (Table 1)
The observed mean contents of N, P and K were 31.60, 2.70 and 31.90 g kg-1, respectively, with coefficients of variation of 15.67% (N), 18.95% (P) and 37.27% (K) (Table 1). These results are similar to those obtained by Ziech et al (2015), who reported N cycling of 27 to 31 g kg-1 and reinforced that the white lupine is able to cycle satisfactory amounts of N (Borkert et al, 2003)
Summary
Lupinus albus L. (white lupine) has been pointed as an important alternative for the recovery of degraded soils (Rovedder & Eltz, 2008; Rovedder et al, 2010) and as an option in the form of soil cover in crop rotation systems (Bevilacqua et al, 2008; Lázaro et al, 2013; Cargnelutti Filho et al, 2014). & Arn. in a dystrophic Quartzarenic Neosol (EMBRAPA, 2006) under degradation (arenization), Rovedder et al (2010) observed that the spacing of 17 cm was the most efficient for biomass yield and that the number of seeds per linear meter did not show significant effect. This information is still incipient for white lupine in areas of agricultural production. The knowledge on the best adjustment for plant density and row spacing could potentiate crop yield
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