ResumoO Brasil é um grande produtor de milho, entretanto, com relação ao milho-verde, o volume de sementes comercializadas para esta finalidade é baixo, e, em alguns casos, o produtor utiliza sementes destinadas a grão e com doses inferiores de nitrogênio, por apresentar um período mais curto até à colheita. Dessa forma, o objetivo do trabalho foi avaliar o desempenho de dois híbridos de milho, destinados a grão, colhidos verdes e comparados a um híbrido destinado a este mercado, em diferentes doses de nitrogênio. O experimento foi realizado durante a safra de 2011/2012, utilizando delineamento experimental de blocos casualizados, em esquema fatorial 3 x 5 (três híbridos de milho em cinco doses de nitrogênio), com três repetições. Foram utilizados os híbridos DKB175, P30F53Y e o AG1051 (controle), sob as doses de 0; 40; 80; 120 e 160 kg ha -1 de N, sendo analisadas as características agronômicas de altura da planta, produtividade de espigas empalhadas, despalhadas e comerciais, comprimento e diâmetro de espigas comerciais, no estádio de R3 (grão leitoso). Os dados obtidos foram submetidos à análise de variância e regressão, e os resultados mostram que o híbrido P30F53Y apresenta melhor desempenho, quando comparado ao DKB175, e semelhante ao controle. A dose a ser utilizada pelo produtor está relacionada com a forma de comercialização das espigas, visando ao consumo in natura. A produtividade máxima de espigas empalhadas e comerciais é obtida nas doses de 143 e 160 kg ha -1 de N para o híbrido P30F53Y, e 93 e 99 kg ha -1 para o híbrido DKB175. Palavras-chave adicionais: espigas comerciais; espigas empalhadas; milho-verde; Zea mays L. AbstractBrazil is a great corn producer but vegetable corn production is still very low. Seed production specifically for vegetable corn is very low so that frequently the producers make use of grain seeds to plant their fields, making use of lower nitrogen doses since the plant cycle will be shortened. The objective of this study was to evaluate the performance of two grain corn hybrids in comparison with that of a vegetable corn hybrid. The experiment took place during the crop year of 2011/12 in a randomized complete block design in a 3 x 5 factorial scheme (three corn hybrids and five nitrogen doses) with three replications. The hybrids DKB175, P30F53Y, and AG1051 (check treatment) were grown under the doses of 0, 40, 80, 120, and 160 kg ha -1 of N. The agronomic characteristics plant height, yield of unhusked, husked, and marketable ears, length and diameter of marketable ears at stage R3 (milky stage) were evaluated. The data were submitted to the variance and regression analyses. The results show that the hybrid P30F53Y had the best performance in comparison to DKB175 and a similar performance in comparison with the check treatment. The dose to be used by the producer depends on the way the ears will be commercialized, having in mind the in natura consumption. The maximum yield of husked and commercial ears results from the doses of 143 and 160 kg ha -1 of N for the hybrid P30...
The aim of this investigative study was to identify and categorize new bean cultivars regarding their efficiency and responsiveness to nitrogen, phosphorus, and potassium, both individually and simultaneously, as well as to stipulate the cultivars that would suit each niche market based on this classification. Three experiments were conducted in the field separated by nutrients adopting the randomized block design in a factorial scheme (11 x 4) of 11 cultivars in four doses with three replications. Grain yield was the variable investigated and the means were the basis for the classification separated by in four availabilities: low, partial, adequate dose, and nutritional excess. Genetic variability was observed among the bean cultivars for efficiency and responsiveness (agronomic efficiency) to nitrogen, phosphorus, and potassium. The following cultivars: BRS Agreste, BRS Estilo, BRS Notável, and Pérola revealed the greatest values of efficiency and responsive ratings for nitrogen, phosphorus, and potassium, with indications for low and high technological levels. On the contrary, the cultivars BRS Ametista and BRS Sublime based on the efficiency and non-responsive classification showed a low ability to acquire or utilize the nutrients for grain formation. The BRS Pontal cultivar for all three nutrients displayed a high degree of efficiency with a value exceeding the average under different conditions of stress, suggesting that a more rustic cultivar best suits the market niche of small farmers.
The objective of this work was to evaluate the potential of corn hybrids for grain productivity and fresh produce marketability in two crop seasons. The experiment applied the completely randomized block design with three replications, during 2013-14 and 2014-15 crops. Ten hybrids indicated for the Midwest region of Goiás state were used, namely 2B512PW, 2B587PW, 2B707PW, 30F35HR, 30F53YH, BRS1055, BM3061, P3646H and P3862YH. Hybrid AG1051 was used as control. The studied variables were ear height (EH), unhusked ear productivity (UEP), husked ear productivity (HEP), marketable ear productivity (MEP), marketable ear length (MEL), marketable ear diameter (MED), grain mass (GM), and gross revenue (GR). Records show that hybrid P3646H achieved results lower than the control in all the analyzed variables, regardless of the crop season, whereas hybrids 2B512PW, BRS1055 and P3862YH showed figures similar to AG1051 in 2013/14 crop and lower ones in 2014/15. Therefore, would not represent direct market competitors, as the control hybrid holds a significant share in the domestic market. Hybrids 2B587PW, 30F35HR, 30F53YH and BM3061 presented the greatest suitability for fresh corn consumption, as featured the highest number of favorable traits for that market.
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