Hirooka, Hiroyuki

Kitagawa, Masayuki

Kumagai, Hajime

Kume, Shinichi

Oishi, Kazato

Tabata, Yusuke

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Nitrogen, Phosphorus and Potassium Utilization and Their Nutrient Cycling in a Beef‐Forage Production System Yusuke Tabata Kyoto University, Japan Masayuki Kitagawa Kyoto University, Japan Kazato Oishi Kyoto University, Japan Hajime Kumagai Kyoto University, Japan Shinichi Kume Kyoto University, Japan See next page for additional authors 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/21/2-2/41 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. Presenter Information Yusuke Tabata, Masayuki Kitagawa, Kazato Oishi, Hajime Kumagai, Shinichi Kume, and Hiroyuki Hirooka This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/2-2/41 瞯 ]386　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Soil Quality and Plant NutritionNitrogen , phosphorus and potassium utilization and their nutrient cycling in a beef‐forageproduction systemYusuke Tabata１ ,Masayuki K itagawa２ ,K az ato Oishi１ , H aj ime K umagai１ ,Shinichi K ume１ and H iroyuki H irooka１１ Graduate School o f A griculture , K yoto University , K yoto , ６０６‐８５０２ , Japan , E‐mail : y tabata＠ kais .kyoto‐u .ac . j p ,２Ex perimental Farm o f K yoto University , K yoto , ６２２‐０２０３ , Jap anKey words :Beef production system , Cycling index , Nutrient balance , Nutrient cycling , U tilization efficiencyIntroduction Quantification of nutrient flow is the first step for nutrient management in the livestock production system . Theobjective of this study was to quantify the cycling for nitrogen ( N ) , phosphorus ( P ) and potassium ( K ) in a beef‐forageproduction system in Japan .Materials and methods Survey was conducted in the Experimental Farm of Kyoto University in Kyoto Prefecture , Japan . Therewere ９ .５ha grassland and about １６０ head of beef cattle in the farm . The herd consisted of breeding cows , calves , heifers andfattening cows and steers . Forage cultivated on the grassland was ensiled and offered to breeding cows . The whole farm systemwas divided into three components : animal , manure and soil/ crop . The nutrient inflow , outflow and cycling of N , P and K inthe soil‐plant‐animal pathway were quantified from April ２００５ to March ２００７ . Nutrient utilizations in each compartment andthe whole farm were evaluated by nutrient balances ( nutrient inflow minus nutrient export) and nutrient utilization efficiencies( nutrient export divided by nutrient inflow ) . Nutrient balance and nutrient utilization efficiency indicate the apparent nutrientlosses and the utilization of nutrient in a whole farm or a compartment . Nutrient cycling was represented using Finn摧s cyclingindex ( Finn , １９８０) .Figure 1 .N , P and K f low in a bee f‐f orage p roduction system(kg year‐1 ha‐1 ) ;average 2005‐2006 , A p ril through March .Results The annual average N , P and K flows ( kg year‐１ ha‐１ ) are shown in Figure １ . The major nutrient inflow was importedto animal component from outside the system for all nutrients . The average nutrient balances of N , P and K in the whole farm( kg year‐１ ha‐１ ) were ４３５畅７ , １３６畅３ and ２６２畅８ , and the average nutrient utilization efficiencies were ０畅０８ , ０ .０６ and ０ .０１ ,respectively . The nutrient balances were the largest in animal component for N and in soil/ crop component for P and K . Theaverage cycling indices of N , P and K were ０ .１９ , ０ .１７ and ０ .４９ , indicating that K was the most cycled in the system .Conclusions The results of each nutrient flow indicated there were differences in the characteristics of nutrients . Thequantitative data from this study would give insight to improve nutrient utilization and reduce nutrient losses in the system .ReferenceFinn , J .T . , (１９８０) . Flow analysis of models of the Hubbard Brook ecosystem . Ecology ６１ , ５６２‐５７１ .System boundary Animal ,=--_':':::r====:-~~ .••• Excreta and bedding N: 242.4, P: 146.5, K: 409 """'S~il~a.._ge-~ Manure N: 140.3 P: 30.9 K: 281.6 Soil/crop ·1• .. '► P: 9.4 K: 2.9 

Nitrogen, Phosphorus and Potassium Utilization and Their Nutrient Cycling in a Beef‐Forage Production System

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Nitrogen, Phosphorus and Potassium Utilization and Their Nutrient Cycling in a Beef‐Forage Production System

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