Cortes-Diaz, Enrique

Martínez-Hernández, Pedro A.

Valdes‐Chimal, Erika

Zaragoza Ramírez, José L.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Seed Yield of Hybrid Brachiaria (CIAT 36061) with Nitrogen Fertilization Enrique Cortes-Diaz Universidad Autónoma Chapingo, Mexico Erika Valdes‐Chimal Universidad Autónoma Chapingo, Mexico José L. Zaragoza Ramírez Universidad Autónoma Chapingo, Mexico Pedro A. Martínez-Hernández Universidad Autónoma Chapingo, Mexico Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/14-1/27 The XXI International Grassland Congress / VIII International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]575　 瞯Grasslands/Rangelands Production Systems——— Seed Science and TechnologySeed yield of hybrid Brachiaria (CIAT 36061) with nitrogen fertilizationEnrique Cortes‐Diaz , Erika V aldes‐Chimal , Jose L . Zaragoz a‐Ramirez , Pedro A . Martinez‐Hernandez . Universidad A .Chap ingo , km 38 .5 carr . Mex ico‐Texcoco , Mex ico , MEX ICO 56230 . ecodia＠ yahoo .com .mxKey words : seed yield component , flowered stems , spikeletsIntroduction Brachiaria hibrido CIAT ３６０６１ , local name �Mulato�is a grass whose production is expanding in the tropicalregions of Mexico and other Latin American countries . Seed availability for this grass , however , is low and seed prices arehigh . Nitrogen fertilization could increase seed yield allowing farmers to meet their sustenance needs , produce their own seed orhave extra seed to sell ( Jimenez , １９９１ ) . The objective of this study was to determine seed yield and its components atincreasing levels of added N .Materials and methods Four levels of added N were compared : ０ ( control ) , １００ , ２００ and ４００ kg ha‐１ yr‐１ in a completelyrandomized design with four replications where the experimental unit was a plot of ２０ m２ . Plots were established in the rainyseason of the previous year . During the rainy season of the following year , the respective N‐level was split in two equalapplications occurring at the beginning and at the middle of the rainy season . Source of N was urea . Plots were harvested at thebeginning of the second rainy season to remove all dead matter before the first N addition was applied . Then at the middle ofthe rainy season plots were again harvested and the second addition of N was done . Finally , the grass was allowed to growwithout further disturbance until seed harvest . T reatment effects on seed yield and other responses ( see Table １ ) wereevaluated with analyses of variance using PROC GLM in SAS ( SAS , ２００６) .Results and discussion Maximum seed yield was found with １００ and ４００ kg N , the amount of seed was two times that foundwith the control , addition of ２００ kg N gave a seed yield no different ( P ＞ ０ .０５) than any of the other levels of N or the control( Table １ ) . Regardless of the amount of N , the addition of N increased ( P ＜ ０ .０５ ) to tal number of stems in relation withcontrol . Spikelets per stem was not influenced ( P ＞ ０ .０５ ) by the addition of N . Number of flowered stems and spikelets m‐２were the two seed‐yield components that showed responses similar to that of seed yield where , １００ and ４００ kg N gave themaximum values while control and ２００ kg N gave similar values .Table 1 Seed y ield and its components in Brachiaria CIA T３６０６１ at di f f erent N f ertiliz ation .N ( kg ha‐１ ) Seed yield( kg ha‐１ )Total stems( number m‐２ )Flowered stems( number m‐２ ) Spikelets stem‐１ Spikelets m‐２０ ,１８ b 樅 ９１７ b ７９２ b １３ a １４５７ b１００ Z３５ a １２９１ a １３３０ a １５ a ２１３９ a２００ Z２９ ab １１５５ a １２３４ ab １４ a １７３５ b４００ Z３７ a １３８７ a １５２７ a １４ a ２８１７ a樅樅 Means within column with at least one letter in common are not different ( P ＞ ０ .０５ )Conclusions Nitrogen fertilization of Brachiaria CIAT ３６０６１ is an agronomic practice that increases seed yield by increasingnumber of flowered stems and spikelets per unit of area , however these increments are not maintained as N level is increased .ReferencesJimenez , M . A . １９９１ . La Producción de Forrajes en México . FIRA‐Banco de Méx ico . ５７ pp .SAS . ２００６ . . SAS /SAT User , s Guide . Release ６ .０３ , SAS Institute , Cary North Carolina , USA .

Seed Yield of Hybrid \u3ci\u3eBrachiaria\u3c/i\u3e (CIAT 36061) with Nitrogen Fertilization

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3503&amp;context=igc

Seed Yield of Hybrid \u3ci\u3eBrachiaria\u3c/i\u3e (CIAT 36061) with Nitrogen Fertilization

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