Structural and productive characteristics of Marandu and Xaraés grasses fertilized at different times after harvesting

Revista Brasileira de Zootecnia

Andrade, Rodrigo Duarte de²  Fonseca, Dilermando Miranda da¹  Silva, Janaina de Lima²  Cecon, Paulo Roberto¹  Pereira, Rosana Cristina²  Pereira, Odilon Gomes¹  Ribeiro, Karina Guimarães²  Silva, Enilson de Barros² 

[1] UFV;UFVJM

关键词: crude protein;    dry matter;    leaf/stem ratio;    nitrogen uptake;    number of leaves;    number of tillers     Introduction Successful use of pastures depends on nutrient availability;    choice of forage;    understanding of morphophysiological mechanisms and their interactions with the environment;    and management;    which are essential for forage growth and persistence (Fagundes et al;   

DOI  :  10.1590/S1516-35982012000300012

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this study was to assess the effect of applying N and K2O at different times after harvest on the structure and production characteristics of Marandu and Xaraés cultivars of Brachiaria brizantha. Two greenhouse 4 × 2 factorial experiments using a randomized block design with eight treatments and four replicates were carried out. In experiment 1, the plants in pots were fertilized weekly with 50 mg/dm3 of N and K2O until a week before a uniformity cut, for a total of four applications. After cutting, plants were fertilized with 50 mg/dm3 of N and K2O at 0, 3, 6, and 9 days. Cultivars were evaluated after 44 days of regrowth. In experiment 2, a single 50 mg/dm3 dose of N and K2O was applied a week before the uniformity cut, and 100 mg/dm3 of N and K2O were applied at 0, 4, 8, and 12 days after cutting; cultivars were evaluated after 39 days of regrowth. In experiment 1, the leaf/stem ratio and dry matter yield were influenced by the time at which fertilizers were applied. In the second experiment, the total number of leaves, expanded leaves, dead leaves, and the leaf lamina accumulated length and dry matter production were influenced by the time at which fertilizers were applied. Marandugrass had more leaves and tillers than cv. Xaraés, which, in turn, had greater height, dry matter yield and regrowth vigor. Applying nitrogen and potassium fertilizer immediately after cutting improves the structural characteristics, while the dry matter yield is maximized by applying fertilizers immediately after cutting by using lower doses of N, or at 4.5 days after cutting by using higher doses of N.

【 授权许可】

CC BY-NC