Berti, R. N.

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University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Cultivating the Surface Soil to Renovate a Grama Rhodes (Chloris gayana K. cv. Callide) Pasture in Northwest Argentine (NOA). 2. Effect of Nitrogen Fertilization R. N. Berti INTA, Argentina 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/21/9-2/26 The 21st International Grassland Congress / 8th 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 ]93　 瞯Grasslands/Rangelands Production Systems——— Livestock Production SystemsCultivating the surface soil to renovate a Grama Rhodes (Chloris gayana K .cv .Callide) pasturein northwest Argentine (NOA) .2 .Effect of nitrogen fertilizationBerti ,R .N .IN TA EEA SA L TA ,A rgentine Republic .rberti＠ correo .inta .gov .arKey words :Grama Rhodes ,nitrogen fertilization ,forage production ,weeds ,Northwest Argentine region .Introduction Grama Rhodes is a pasture employed in several regions of NOA . Its production is strongly to associate toavailability of nitrogen in soils (Berti ,２００６ ) .Methods to improve the supply of nitrogen to grass on NOA are being sought .Material and Methods At Cerrillos ,Salta ( ２４°５４′S ; ６５°２９′W ; １２５０ m .) ,Argentina ,on a grama Rhodes pasture seeded in １９９４ atrial was carried out in November ２０００ ,which was related in another paper ( Berti ,２００８ ) .Total rainfall for ２０００ /０１ ; ０１ /０２ ;０２ /０３ ; ０３ /０４ and ０４ /０５ ,covering the experimental period ( May‐November ) were ８４４ .７ ; ５６６ .３ ; ５４８ .２ ; ５６２ .４ and ３５６ mm .The historical annual average for the site was ６４３ mm .A split‐split plot design ,with three replications were employed .Twolevels of nitrogen fertilization ,(０) Control ,no fertilizer and (１) ,１００ kg N ha ‐１ were used .Nitrogen was applied annually ,withbroadcasting urea af ter cultivation in the end of November ,before the first rain .Seven harvest of plant material were donebetween Nov .２０００ and Mar .２００５ .The plant samples were dried ,weighed ,grounded and Nitrogen ( N ) and Dry Matter ( DM )content was determined ( A .O .A .C . ,１９８０) .In the last period samples were taken from ０ to ２０ cm layers of soil ,w ith a ２ .５ cmcoring tube at fif teen random position in each plot at the end of the growing season .These samples were dried and N‐NO‐３determined (Bremner et al ,１９６６) .Results and Discussion The fertilization increased aerial biomass of Grama ,weeds ,and nitrogen content of forage ( Table １ ) .Atthe end of trial the content in soil of N‐Nitrate ( N‐NO‐３ ) in treatment fertilized was significantly higher .The mean responseobtained (２０ kg DM by unit of N ) in grama is similar to the one previously reported (Berti ,２００６) .During the periods ０３ /０４ andmainly in ０４ /０５ ,lack of rains occurred af ter cultivation resulting in increased of weeds in treatments with N .Table 1 E f f ect o f f ertiliz ation treatments on the total y ields and N content o f grama ,weeds ,and N‐nitrate in soil .Fertilization Grama D .M . ,kg ha‐１ Grama N . ,kg ha‐１ Weeds D .M . ,kg ha‐１ Soil N‐NO‐３ ,ppm０ ,No fertilizer １２４１１a １２２a １７４a １２ ＃.５a１ ,１００ kg N year ha‐１ ２２４４１b ２６１b ７８９b １７ 牋.４bMSE Z ２６３３ Q.５ ３６ 珑.２ ５４８ 痧３ 　.９a ,b : Values on the same column with different letters are different ,P ＜ ０ .０５ .Duncan Test .z : Standard error of the mean .Conclusion Nitrogen fertilization significantly increased aerial biomass of Grama and weeds .ReferencesA .O .A .C . ,１９８０ .Ass .Off .Agr .Chemistry . O f f icial Methods o f A nalysis .Washington ,D .C . .Berti ,R .N .２００６ .Effect of soil scarification and nitrogen fertilization of Chloris gayana Cv .Callide ,on forage accumulation .RA PA ,Vol .26 ,Sup l : １２１‐１２２ .Berti ,R .N .２００８a .Cultivating the surface soil to renovate a Grama Rhodes ( Chloris gayana K .cv .Callide) pasture in NorthwestArgentine ( NOA) .１ .Effect of implements ( In this Congress) .Brenmer ,J .M .and Keeney ,D .R . ,１９６６ .Exchangeable ammonium nitrate and nitrite by extraction‐distillation methods . SoilSci .Am .Proc . ,３０ :５７７‐５８２ .

Cultivating the Surface Soil to Renovate a Grama Rhodes (Chloris gayana K. cv. Callide) Pasture in Northwest Argentine (NOA). 2. Effect of Nitrogen Fertilization

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Cultivating the Surface Soil to Renovate a Grama Rhodes (Chloris gayana K. cv. Callide) Pasture in Northwest Argentine (NOA). 2. Effect of Nitrogen Fertilization

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