Development of lawns in response to applications of imazapic alone or combined with imazapyr/Desenvolvimento de gramados em resposta a utilizacao de imazapic isolado ou em associacao com imazapyr.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 3,859 words

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Abstract :

HIGHLIGHTS: The imazapic applied alone or in tankmixture with imazapyr can be used as a growth regulator of lawns with Tifton 419 grass. The herbicide imazapic applied alone or in a tank mixture with imazapyr can control the growth of lawns with Zoysia grass. Some doses of imazapic applied alone or combined with imazapyr can affect the visual aspect of lawns with Zoysia grass. Successive mowings are the major maintenance cost of lawns. These costs have led to the search for alternatives to mechanical management. This study aimed to determine the effects of imazapic herbicide doses applied alone or combined with imazapyr as a growth regulator of Tifton 419 and Zoysia grasses. The experimental design was randomized blocks with four replicates, and the treatments consisted of four doses of herbicide imazapic applied alone (35; 70; 105 and 140 g a.i. [ha.sup.1]) and three doses of imazapic + imazapyr mixture (7.875 + 2.625; 15.57 + 5.25 and 23.625 + 7.875 g a.i. [ha.sup.1]) in two sequential applications on both grass lawns. Visible injury symptoms, canopy height, height and number of inflorescences, and total dry matter of clippings were determined. Applications of imazapic alone or combined with imazapyr effectively reduced all morphological variables of Tifton 419 grass. Imazapic applied alone or mixed with imazapyr provided adequate control of growth and quantity of dry matter of Zoysia grass clippings. Still, with some application doses of this herbicide, the number of inflorescences present in the lawns increased. Keywords: Cynodon dactylon x C. transvaalensis, Zoysia japonka, bermuda grass, zoysia grass Operacoes sucessivas de corte sao os principais custos na manutencao de gramados. O dispendio com os cortes leva abusca por alternativas para o manejo mecanico. O presente estudo teve por objetivo estudar os efeitos de doses do herbicida imazapic aplicado isolado ou em associacao com imazapyr, como regulador de crescimento das gramas Tifton 419 e Esmeralda. Adotou-se o delineamento experimental de blocos casualizados, com quatro repeticoes e os tratamentos constituiram de quatro doses do herbicida imazapic isolado (35; 70; 105 e 140 g i.a. [ha.sup.1]) e tres doses da associacao de imazapic + imazapyr (7,875 + 2,625; 15,57 + 5,25 e 23,625 + 7,875 g i.a. [ha.sup.1]) em duas aplicacoes sequenciais para ambas as especies. Avaliaram-se os sintomas visuais de injuria, a altura do dossel, a altura e o numero de inflorescencias e a materia seca total das aparas. As aplicacoes de imazapic isolado ou em associacao com imazapyr foram efetivas na reducao de todas as variaveis morfologicas da grama Tifton 419. O imazapic aplicado isolado ou associado ao imazapyr proporcionou controle satisfatorio do crescimento e da quantidade de materia seca das aparas da grama Esmeralda, no entanto, algumas doses desse herbicida aumentaram o numero de inflorescencias presentes nos gramados. Palavras-chave: Cynodon dactylon x C. transvaalensis, Zoysia japonka, grama bermuda, grama esmeralda

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Gale Document Number: GALE|A674989390