Sete décadas de evolução do sistema produtivo da cultura do milho

Galvão, João Carlos Cardoso; Miranda, Glauco Vieira; Trogello, Emerson; Fritsche‐Neto, Roberto

doi:10.1590/0034-737x201461000007

Cited by 41 publications

(32 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The maize crop has drastically changed with the adoption of hybrid cultivars, in 1933 in the United States, 1944 in Brazil [1] and 1950 in Europe [2]. According to Duvick [3], the use of hybrid cultivars is beneficial due to increased yields, stability and uniformity of the crops.…”

Section: Introductionmentioning

confidence: 99%

Genetic Vulnerability and the Relationship of Commercial Germplasms of Maize in Brazil with the Nested Association Mapping Parents

et al. 2016

View full text Add to dashboard Cite

A few breeding companies dominate the maize (Zea mays L.) hybrid market in Brazil: Monsanto® (35%), DuPont Pioneer® (30%), Dow Agrosciences® (15%), Syngenta® (10%) and Helix Sementes (4%). Therefore, it is important to monitor the genetic diversity in commercial germplasms as breeding practices, registration and marketing of new cultivars can lead to a significant reduction of the genetic diversity. Reduced genetic variation may lead to crop vulnerabilities, food insecurity and limited genetic gains following selection. The aim of this study was to evaluate the genetic vulnerability risk by examining the relationship between the commercial Brazilian maize germplasms and the Nested Association Mapping (NAM) Parents. For this purpose, we used the commercial hybrids with the largest market share in Brazil and the NAM parents. The hybrids were genotyped for 768 single nucleotide polymorphisms (SNPs), using the Illumina Goldengate® platform. The NAM parent genomic data, comprising 1,536 SNPs for each line, were obtained from the Panzea data bank. The population structure, genetic diversity and the correlation between allele frequencies were analyzed. Based on the estimated effective population size and genetic variability, it was found that there is a low risk of genetic vulnerability in the commercial Brazilian maize germplasms. However, the genetic diversity is lower than those found in the NAM parents. Furthermore, the Brazilian germplasms presented no close relations with most NAM parents, except B73. This indicates that B73, or its heterotic group (Iowa Stiff Stalk Synthetic), contributed to the development of the commercial Brazilian germplasms.

show abstract

Section: Introductionmentioning

confidence: 99%

Genetic Vulnerability and the Relationship of Commercial Germplasms of Maize in Brazil with the Nested Association Mapping Parents

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Galvão et al [5] evaluated the advances in the production of corn in Brazil since the 1940s and found that technology has contributed to an increase in productivity of 379% over the past 70 years. Research institutions have contributed to this increase in productivity through the development of research, cultivars and technologies, the training of specialised personnel, and the communication of information to farmers.…”

Section: Brazilian Research In Corn Productionmentioning

confidence: 99%

Use of Technology to Increase the Productivity of Corn in Brazil

Buso¹,

Silva²

2018

Maize Germplasm - Characterization and Genetic Approaches for Crop Improvement

View full text Add to dashboard Cite

Brazil is one of the world's principal producers of corn, and over the past few decades, a range of new technologies have been incorporated to guarantee advances in the productivity of this crop. Initially, genetic enhancement was achieved through the production of hybrid seed that was more productive than freely pollinated cultivars. Subsequent adjustments to cultivation practices, such as the reduction in row spacing, balanced fertilisation and direct planting, have contributed to a progressive increase in productivity. The authorisation of the marketing of transgenic seed, providing resistance to insect pests and herbicides, contributed further to productivity by reducing losses to pests (Spodoptera frugiperda) and competition with weeds. Together, all these technological advances have contributed to ever increasing gains in the productivity of Brazilian corn crops.

show abstract

“…Despite its advantages, C. spectabilis does not generate a direct economic return for the producer and, therefore, a wider adoption of its cultivation in crop rotation/succession systems is still limited. A potential alternative to address this problem is the intercropping of cultures, which makes better use of the crops by providing, in the same period, economic return from the production of grains and benefits of the intercrop species (GALVÃO et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

SELECTIVITY OF BENTAZON AND NICOSULFURON IN Crotalaria spectabilis INTERCROPPED WITH MAIZE CULTURE

et al. 2019

View full text Add to dashboard Cite

Corn intercropped with showy crotalaria allows better use of the agricultural year, having in the same period, economic return from grain yield and the benefits of the legume. The objective was to study the selectivity of the herbicides bentazon and nicosulfuron to C. spectabilis, the weed control and the corn development intercropping system. Two experiments were conducted in the field, one in late-season and the other one in regular growing season. The experimental design was the randomized block, with fourteen treatments and four replicates. Eight treatments with herbicides were studied: bentazon (720 e 960 g a.i. ha -1 ), nicosulfuron (16 e 48 g a.i. ha -1 ) and bentazon + nicosulfuron (720 + 16; 720 + 48; 960 + 16; 960 + 48 g a.i. ha -1 ). Moreover, six controls were maintained: sole corn and sole showy crotalaria (with and without weeds), corn and sunn hemp intercropped (with and without weeds). The herbicide bentazon isolated, in both dosages tested, was selective to C. spectabilis. Nicosulfuron in 48 g a.i. ha -1 , isolated or in mixture with bentazon, promoved the best weed control. Corn affected the recoverability of showy crotalaria plants treated with herbicides. In intercrop of corn and C. spectabilis, both late and regular season had good results in corn yield, legume mass accumulation without the necessity of herbicides pulverization. SELETIVIDADE DE BENTAZON E NICOSULFURON PARACrotalaria spectabilis EM CONSÓRCIO COM A CULTURA DO MILHO RESUMO -O consórcio de milho com crotalária possibilita o melhor aproveitamento do ano agrícola, tendo no mesmo período o retorno econômico com a produção de grãos e os benefícios da leguminosa. Objetivou-se com esse trabalho, estudar a seletividade dos herbicidas bentazon e nicosulfuron para Crotalaria spectabilis, o controle de plantas daninhas e o desenvolvimento do milho no sistema de consórcio. Dois experimentos foram desenvolvidos em campo, um no período de safrinha e outro no período de safra. O delineamento experimental foi em blocos ao acaso, com 14 tratamentos e quatro repetições. Foram estudados oito tratamentos com herbicidas: bentazon (720 e 960 g i.a. ha -1 ), nicosulfuron (16 e 48 g i.a. ha -1 ) e bentazon + nicosulfuron (720 + 16; 720 + 48; 960 + 16; 960 + 48 g i.a. ha -1 ). Além disso, foram mantidas seis testemunhas: milho e crotalária solteiros (com e sem plantas daninhas), milho e crotalária em consórcio (com e sem plantas daninhas). O herbicida bentazon isolado, nas duas dosagens testadas, foi seletivo para C. spectabilis. Nicosulfuron a 48 g i.a. ha -1 , isolado ou em mistura com bentazon, promoveu o melhor controle das plantas daninhas. O milho afetou a capacidade de recuperação das plantas de crotalária tratadas com herbicidas. No consórcio de milho com C. spectabilis, tanto na safrinha como na safra, houve bons resultados de produtividade do milho e acúmulo de massa pela leguminosa sem a necessidade de aplicação de herbicidas. Palavras-chave: Adubo verde. Crotalária. Fitointoxicação. Interferência. Semeadura simultânea.

show abstract

Sete décadas de evolução do sistema produtivo da cultura do milho

Cited by 41 publications

References 22 publications

Genetic Vulnerability and the Relationship of Commercial Germplasms of Maize in Brazil with the Nested Association Mapping Parents

Genetic Vulnerability and the Relationship of Commercial Germplasms of Maize in Brazil with the Nested Association Mapping Parents

Use of Technology to Increase the Productivity of Corn in Brazil

SELECTIVITY OF BENTAZON AND NICOSULFURON IN Crotalaria spectabilis INTERCROPPED WITH MAIZE CULTURE

Contact Info

Product

Resources

About