@article {Luís:2001:0103-9016:271,
title = "Desempenho de hbridos de milho com ciclos contrastantes em funo da desfolha e da populao de plantas Performance of contrasting cycle maize hybrids as affected by defoliation and plant population",
journal = "Scientia Agricola",
parent_itemid = "infobike://doaj/01039016",
publishercode ="doaj",
year = "2001",
volume = "58",
number = "2",
publication date ="2001-01-01T00:00:00",
pages = "271-276",
itemtype = "ARTICLE",
issn = "0103-9016",
url = "https://www.ingentaconnect.com/content/doaj/01039016/2001/00000058/00000002/art00013",
doi = "doi:10.1590/S0103-90162001000200009",
author = "Lu{\’ı}s Sangoi and Milton Luiz de Almeida and Vanderlei Adilson Lech and Luiz Carlos Gracietti and Clair Rampazzo",
abstract = "A velocidade com que o milho se desenvolve da emergncia at a antese pode interferir na determinao de prticas de manejo importantes para a cultura, bem como na sua capacidade de tolerar estresses na florao. Este trabalho foi conduzido objetivando determinar a relao existente entre precocidade e a resposta de hbridos de milho ao incremento na populao de plantas e reduo de rea foliar. O experimento foi conduzido em Lages, SC, durante o ano agrcola de 1999/2000. Foram testados trs hbridos contrastantes em exigncia calrica para florescimento&58; P32R21, super precoce&59; Premium, precoce&59; e C333B, tardio. Foram estudadas quatro densidades&58; 25.000, 50.000, 75.000 e 100.000 pl ha-1. Os gentipos foram avaliados com sua rea foliar intacta e com remoo de metade das folhas verdes presentes durante o espigamento. A populao de plantas necessria para maximizar o rendimento de gros foi tanto menor quanto mais tardio o hbrido. O hbrido superprecoce P32R21 apresentou menor rea foliar e maior rendimento de gros do que o tardio C333B, tanto nas parcelas em que as folhas foram mantidas intactas quanto nas desfolhadas. Isto ocorreu devido a maior capacidade do P32R21 de remobilizar as reservas do colmo para atender demanda exercida pelos gros.&60;br&62;The speed of maize development from emergence to anthesis may affect the response of the crop to important management practices and interfere on the ability of corn to cope with stresses at flowering. This experiment was conducted objecting to evaluate the relationship between earliness and maize response to the increase in plant population and defoliation. The trial was performed in Lages, SC, Brazil, during 1999/2000. Three contrasting hybrids in terms of heat unit requirement to reach flowering were tested&58; P32R21, very early&59; Premium, early&59; and C333B, late. These hybrids were submitted to four plant populations&58; 25,000, 50,000, 75,000 and 100,000 pl ha-1. Genotypes were evaluated with full leaf area and removing half of their green leaves at silking. The plant population required to maximize grain yield was lower for late than for early hybrids. Hybrid P32R21 presented a smaller leaf area and greater grain yield than C333B, regardless of defoliation. This was accomplished due to P32R21 higher capacity to mobilize its stem stored compounds to match the sink demand of the grain.",
}