Details

Autor(en) / Beteiligte

• Li, Xiufen
• Dou, Fugen
• Watkins, Kenton B.
• Wang, Shu
• Chen, Kun
• Zhou, Xin‐Gen
• McClung, Anna
• Storlien, Joseph O.
• Hons, Frank M.

Titel

Seeding rate effects on organic rice growth, yield, and economic returns

Ist Teil von

• Agronomy journal, 2020-09, Vol.112 (5), p.4104-4119

Erscheinungsjahr

2020

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• Seeding rate is an important factor in optimizing yield components and thus grain yield of conventional rice (Oryza sativa L.), yet limited information on its effect on organic rice production is available. A field study was conducted under organic management over 2 yr to comprehensively evaluate the effects of seeding rate (108, 161, 215, 269, 323, 376, and 431 seeds m−2) and rice cultivar (Presidio [inbred] and XP753 [hybrid]) on yield components, grain yield, milling quality, weed density, and economic returns. Seeding rate had significant effects on seedling stand density and dry biomass with positive linear correlations. Yield linearly increased with increasing seeding rate with the greatest yields of 3,462 kg ha−1 for Presidio and 7,508 kg ha−1 for XP753 at the highest seeding rate tested. Panicle number was positively correlated with seeding rate, while milling quality was not affected by seeding rate. The linear‐plateau (LP) model fit best for Presidio and the quadratic‐plateau (QP) model fit best for XP753 to estimate the ex ante economic optimum seeding rate (EOSR). The EOSR was 87 kg ha−1 (340 seeds m−2) for Presidio and 48 kg ha−1 (192 seeds m−2) for XP753. Using the EOSR, producers could expect a yield of 3053 kg ha−1 and an economic return of US$1,288−$1,346 ha−1 for Presidio, and a yield of 5,835−6,092 kg ha−1 and an economic return of $1,986−$2,686 ha−1 for XP753.