Revised 10/2015; Originally published 10/2013. / 2 pp. / Grain yield, test weight, and other characteristics of barley, durum, and wheat varieties are provided in this publication

Master of Agribusiness / Department of Agricultural Economics / Allen M. Featherstone / Examining the interaction between population and corn yield is important because the challenge of feeding the world is real. Projections show the world population is increasing and expected to reach over 9 billion people by around 2050. Expanding global urbanization drives the need to increase corn yield on current land and needs to occur to meet global population growth. Previous studies on corn yield increases conclude that ear size is limited and increasing corn plants per acre is important to increasing yield potential. This study used Answerplot data to analyze the effect of increasing plant population on corn yield in 2009. There are over 150 Answerplots across the cornbelt. The weather of 2009 proved to be a challenging year in certain regions of the cornbelt. Record rainfall, and below normal temperature had an influence on corn yield. A total of 4,180 observations from Answerplot were used from across the nation to analyze the relationship between corn yield and plant population. Multiple regression models were estimated and found that in 2009, an increase in plant population from 30,000 to 40,000 plants per acre resulted in an 8.5 bushel per acre increase. This result was robust for various econometric models. Economically, the cost per acre for current seed for this increase in population is about $38.87 per acre. At a corn price greater than $4.58 per bushel, increasing plant population would have made economic sense for 2009.

Submitted by Maria Beatriz Vieira (mbeatriz.vieira@gmail.com) on 2017-03-29T12:34:17Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) dissertacao_vitor_dante_poletto.pdf: 713579 bytes, checksum: bb3ca36d7dab11a50d2a6e2b9fa3c3df (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2017-04-05T17:41:22Z (GMT) No. of bitstreams: 2 dissertacao_vitor_dante_poletto.pdf: 713579 bytes, checksum: bb3ca36d7dab11a50d2a6e2b9fa3c3df (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2017-04-05T17:42:23Z (GMT) No. of bitstreams: 2 dissertacao_vitor_dante_poletto.pdf: 713579 bytes, checksum: bb3ca36d7dab11a50d2a6e2b9fa3c3df (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-04-05T17:42:34Z (GMT). No. of bitstreams: 2 dissertacao_vitor_dante_poletto.pdf: 713579 bytes, checksum: bb3ca36d7dab11a50d2a6e2b9fa3c3df (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2015-05-19 / Sem bolsa / A produção brasileira de trigo tem variado conforme o mercado interno e externo. Isso porque o mercado interno não supre o consumo total do país e por isso torna-se necessária a importação. Além de diferenciais como preço pago ao produtor, outra característica importante é a criação de cultivares para tornar a atividade viável economicamente. Essas cultivares devem ser produtivas e com bom peso hectolítrico. Diversas empresas testam e analisam os dados das cultivares para que a decisão do produtor se torne mais fácil na análise e decisão de cultivar. O objetivo do trabalho foi analisar sete cultivares plantadas nas três regiões tritícolas no estado do Paraná, conforme recomendação do Ministério da Agricultura, Pecuária e Abastecimento, a partir de dados fornecidos pela Fundação Pró-Sementes. As cultivares utilizadas foram: BRS GUAMIRIM, FPS NITRON, IAPAR 130, IAPAR 144, MARFIM, TBIO SELETO E TBIO TIBAGI. Foram analisados os dados de produtividade e peso hectolítrico em três anos safras (2012, 2013 e 2014). As cultivares de trigo apresentam produtividade muito semelhantes entre si, embora pertençam a diferentes obtentores; variações não significativas são observadas entre cultivares de acordo com o local de semeadura; a cultivar FPS Nitron apresenta alto peso hectolítrico, acima de 83 kg.hl-1, especialmente quanto cultivado em regiões baixas, de clima quente e moderadamente seco. / The Brazilian production of wheat has varied according to the domestic and foreign markets. This is because the internal market does not meet the total consumption of the country and therefore imports becomes necessary. In addition to advantages such as price paid to producers, another important feature is the creation of cultivars to make economically viable activity. These cultivars should be productive and good test weight. Several companies test and analyze the cultivars data to the producer's decision becomes easier when it is analyzing which to grow plant. The objective was to analyze 7 cultivars planted in the three regions of VCU's Parana state, as recommended by the Ministry of Agriculture, Livestock and Supply, from data provided by Pro-Seed Foundation. The cultivars were BRS Guamirim, FPS NITRON, IAPAR 130, IAPAR 144, IVORY, TBIO SELECT AND TBIO TIBAGI. Productivity data and test weight were analyzed in three years vintages (2012, 2013 and 2014). The wheat cultivars present productivity very similar to each other, although belonging to different breeders '; Non-significant variations are observed between cultivars according to the location of seeding; To cultivate high hectoliter weight presents Nitron FPS, up to 83 kg hl-1, especially as cultivated in low-lying regions, moderately dry and hot climate.