Efeitos de população de plantas na semeadura a lanço de soja

Plant population effects upon broadcasted sowed soybean

Resumo

Broadcast sowing soybeans at seed rates of 57, 110 and 154 kg/ha was tested at Ribeirão Preto Experimental Station, Instituto Agronômico, São Paulo State, Brazil, in 1978-1979. The experimental area received previous fertilization of 160 kg/ha of P2O5 as simple superphosphate and 90 kg/ha of K2O as potassium chloride, and a mixture of the herbicides "trifluoraline" (2 l/ha) and "metribuzin" (0.7 kg/ha). Seeds of cultivar Paraná were distributed on the soil sulface and immediately incorporated into soil by disk harrow. Plant height at maturity and insertion height of lower pods were positively related with seeding rate. Seed yields of 2682 and 2675 kg/ha for the rates of 110 and 154 kg/ha of planted seeds did not significantly outyielded the seeding rat of 57 kg/ha.


NOTA

Efeitos de população de plantas na semeadura a lanço de soja

Plant population effects upon broadcasted sowed soybean

Gastão Moraes da SilveiraI, * * Com bolsa de suplementação do CNPq. ; Nelson Raimundo BragaII; José Carlos Vila Nova Alves PereiraIII, * * Com bolsa de suplementação do CNPq. ; Eduardo Antonio BulisaniII, * * Com bolsa de suplementação do CNPq.

ISeção de Máquinas de Movimentação do Solo, IAC

IISeção de Leguminosas, Instituto Agronômico, IAC

IIIEstação Experimental de Ribeirão Preto, IAC

SUMMARY

Broadcast sowing soybeans at seed rates of 57, 110 and 154 kg/ha was tested at Ribeirão Preto Experimental Station, Instituto Agronômico, São Paulo State, Brazil, in 1978-1979. The experimental area received previous fertilization of 160 kg/ha of P2O5 as simple superphosphate and 90 kg/ha of K2O as potassium chloride, and a mixture of the herbicides "trifluoraline" (2 l/ha) and "metribuzin" (0.7 kg/ha). Seeds of cultivar Paraná were distributed on the soil sulface and immediately incorporated into soil by disk harrow.

Plant height at maturity and insertion height of lower pods were positively related with seeding rate. Seed yields of 2682 and 2675 kg/ha for the rates of 110 and 154 kg/ha of planted seeds did not significantly outyielded the seeding rat of 57 kg/ha.

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Recebida para publicação a 20 de fevereiro de 1981.

  • 1. COOPER, R. L. Response of soybean cultivars to harrow rows and planting rates under weed-free conditions. Agronomy Journal, 69(1):89-92, 1977.
  • 2. FELTON, W. L. The influence of row spacing and plant population on the effect of weed competition in soybeans (Glycine max). Australian Journal of Experimental Agriculture and Animal Husbandry, 16:(83):926-931, 1978.
  • 3. GUIMARÃES, J. A. P.; ARANTES, N. E.; MAIA, A. Efeito de semeadura a lanço em soja sobre a produção de grãos e outras características agronômicas. In: ENCONTRO DE SOJA ENTRE ENSINO, PESQUISA, EXTENSÃO E PRODUÇÃO, 2., Uberaba, 1977. Resumos.
  • 4. LEEA, H. S. & CHO, H. Y. Studies on the improvement of plant type for dense planting of soybeans. University of College Agricultural Bulletin, 1(2):45-60, 1976.
  • 5. LUESHEN, W. E.; HIKS, D. R. Influence of plant population on field performance of thee soybean cultivars. Agronomy Journal, 69(3):390-393, 1977.
  • 6. OSAFO, D. M. Effects of population density on yields of two soybeans (Glycine max) varieties on Ghana forest zone. Experimental Agriculture, 13(3):235-240, 1977.
  • 7. SILVEIRA, G. M.; BRAGA, N. R.; FORSTER, R.; JORGE, J. P. N.; TISSELLI FILHO, O. Resultados preliminares da semeadura a lanço de soja. Bragantia, Campinas, 38:XLV-XLVII, 1979. (Nota, 10)

  • *
    Com bolsa de suplementação do CNPq.

Datas de Publicação

  • Publicação nesta coleção
    17 Dez 2007
  • Data do Fascículo
    1983

Histórico

  • Recebido
    20 Fev 1981
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E-mail: bragantia@iac.sp.gov.br