Cotton zoning based on sowing periods of lower risk in Parana state, Brazil

Brazilian Archives of Biology and Technology

Marcos Silveira Wrege²  Paulo Henrique Caramori¹  Sergio Luiz Gonçalves²  Wilson Paes De Almeida¹  Celso Jamil Marur¹  José Ricoy Pires¹  Ruy Seiji Yamaoka¹ 

[1] ,FINATECBrasília DF

关键词: Cotton;    climatic risk;    planting dates;    zoning;    low temperature;   

DOI  :  10.1590/S1516-89132000000100010

来源: SciELO

【 摘 要 】

Cotton is cultivated in the North and West of Parana State, southern Brazil, under conditions of climatic risk variable in space and time. Risks of temperature below 15ºC at the establishment period, daily average temperature below 20ºC at the stage of cotton boll opening, and soil water deficit for both plant establishment and flowering periods, were estimated to identify homogeneous zones with sowing periods of lower climatic risk. The time interval with adequate temperature, associated with minimum risks of the other factors and yield data from field experiments allowed the identification of seven distinct zones, with best sowing periods ranging from September 20 to November 20. Official credit to the farmers is conditioned by the Central Bank of Brazil upon following these recommendation of best sowing periods for each municipality.

【 授权许可】

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