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Modeling carbon assimilation and morphogenesis responses of Mulato II Brachiariagrass under contrasting growth rates and in response to canopy height maintained by continuous stocking

Grant number: 13/01777-9
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2013
Effective date (End): May 31, 2016
Field of knowledge:Agronomical Sciences - Animal Husbandry - Pastures and Forage Crops
Principal researcher:Carlos Guilherme Silveira Pedreira
Grantee:Valdson José da Silva
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated scholarship(s):14/08789-5 - Herbage accumulation, grazing efficiency, morphogenetic characteristics and modeling carbon assimilation of Mulato II brachiariagrass under contrasting growth rates and in response to canopy height maintained by continuous stocking, BE.EP.DR

Abstract

In Brazil, although forage production is key management is conducted, in most cases, based on broad, non-specific guidelines, which hinders the competitiveness of the livestock industry. This is result, in part of the low availability of technical and scientific information, especially for newly released forage genotypes, which are adopted by producers without adjustments in grazing management. The objectives of this research are to describe and explain the carbon assimilation and morphogenesis responses of Brachiaria hybrid Convert HD 364 (cv. Mulato II) in response to two growth rates and canopy heights maintained by continuous stocking. An experiment will be conducted in Piracicaba, SP, during two summer grazing seasons. The experimental design is a randomized complete block, with a 3 x 2 factorial arrangement, corresponding to three sward heights (10, 25 and 40 cm) maintained by continuous stocking and two growth rates imposed by two N rates (50 and 250 kg N ha-1 yr-1), with three replications, totaling 18 experimental units. Responses studied include morphogenenic characteristics, development and senescence, biomass production, leaf area index, light interception by sward, leaf angle, forage losses and grazing efficiency, photosynthetic indices, as well as modeling canopy CO2. Data will be analyzed using PROC MIXED of SAS, and treatment means will be compared by student's t-test at the 5% level of probability. It is expected that the results will allow better understanding of the morphological and physiological adaptations of this new grass to management variables.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, VALDSON J.; PEDREIRA, CARLOS G. S.; SOLLENBERGER, LYNN E.; SILVA, LILIANE S.; YASUOKA, JUNIOR I.; ALMEIDA, IANE C. L.. Carbon Assimilation, Herbage Plant-Part Accumulation, and Organic Reserves of Grazed `Mulato II' Brachiariagrass Pastures. CROP SCIENCE, v. 56, n. 5, p. 2853-2860, . (13/01777-9, 14/08789-5)
SILVA, VALDSON J.; PEDREIRA, CARLOS G. S.; SOLLENBERGER, LYNN E.; SILVA, LILIANE S.; YASUOKA, JUNIOR I.; ALMEIDA, IANE C. L.. Canopy Height and Nitrogen Affect Herbage Accumulation, Nutritive Value, and Grazing Efficiency of `Mulato II' Brachiariagrass. CROP SCIENCE, v. 56, n. 4, p. 2054-2061, . (13/01777-9, 14/08789-5)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SILVA, Valdson José da. Carbon assimilation, herbage accumulation, nutritive value, and grazing efficiency of Mulato II brachiariagrass under continuous stocking. 2016. Doctoral Thesis - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.