Table Of Content

Agricultural Systems 35 (1991) 481-482 CONTENTS OF VOLUME 35 Number 1] GINQUAL: A Cotton Processing Quality Model ' G. L. BARKER, R. V. BAKE& RJ. W. LAIRD (USA) Structure and Behavior of a Deterministic Model of Reproductive Performance in Beef Cattle . 21 Fo DENHAM, R. E. LARSEN, cf BOUCHER & E. i ADAMS (USA) Modeling Competition for Light between Soybean and Broadleaf Weeds . 37 L. J. WILES & G. G.W ILKERSON (USA) Adapting the SPUR Animal Submodel for use on Fescue Pastures by ore Rumen and Heat Stress Logic. , : 53 D. H. SEMAN, M. H. FRERE, j A. STUEDEMANN & S. R. WILKINSON (USA) Environmental Conservation and Sheep Farming in the United Kingdom . 69 G. O. HUGHES (UK) A Mathematical Model for the Impact of Energy Input in Land Preparation on Yield of Rice , 81 ABHIJIT BHATTACHARYA (India) Fertilizer and Organic Manure use Under Uncertainty: Policy Comparisons for Irrigated and Dryland Farming Systems in South India ___. 89 SURESH CHANDRA BABU (USA), S. R. SUBRAMANIAN (India) & B. RAJASEKARAN (USA) Book Reviews 103 Number 2 FLORES: A Model on the Keeping Quality of Cut Flowers 111 WOUTER G. VAN DOORN & L. M. M. TIJSKENS (The Netherlands) Modeling the Impacts of Two Agricultural Policies on the US Livestock Sector: A Systems Approach . JON A. BRANDT, ROBERT E. YOUNG I] & ABNER W. WOMACK (USA) Economic Optimisation of Heliothis Thresholds on Cotton Using a Pest Management Model , , : 157 P. G. COX, S. G. MARSDEN, K. D. BROOK, H. TALPAZ & A. B. HEARN (Australia) Improvement of Yielding Ability in Japonica Rice Cultivars and its Impact on Regional Yield Increase in Kinki District, Japan. 173 TOSHIHIRO HASEGAWA, TAKESHI HORIE (Japan) & BRIAN S. YANDELL (USA) 481 Agricultural Systems (35) (1991)}—@© 1991 Elsevier Science Publishers Ltd, England. Printed in Great Britain 482 Contents of Volume 35 A Simulation Model to Assess Primary Production and Use of Bouteloua gracilis Grasslands. Part I—Model Structure and Validation . ; 189 QUITO LOPEZ-TIRADO & J. G. W. JONES (UK) A Simulation Model to Assess Primary Production and Use of Bouteloua gracilis Grasslands. Part II—Experimentation. 209 QUITO LOPEZ-TIRADO & J. G. W. JONES (UK) Book Reviews 229 Number 3 ‘Systems Research’ or ‘Research with a Systems Perspective’ in Africa Some Organizational and Technical Issues. . ; 235 W. A. STOOP (The Netherlands) & R. J. BINGEN (USA) An Approach to the Development of Expanded Postgraduate Training for Agricultural Scientists within the Southern African Development Coordination Conference Region 251 R. B. JONES & M. J. BLACKIE (Malawi) Validation of Agricultural Expert Systems . 265 S. R. HARRISON (Australia) The Development of a Prototype Computerised Management Information System for a Mixed Enterprise Farm 287 J. F. FAVIER (UK) & V. A. DODD (Republic of Ireland) Estimations of the Increase in Milk Production due to the Introduction of Maize Silage to a Dairy Farm in a Subtropical Environment: A Time Series Approach 313 D. V. KERR, R. T. COWAN & J. CHASELING (Australia) Crop Simulation Modelling Using a Transputer-based Parallel Computer . 321 P. K. THORNTON, J. A. BLAIR-FISH& S. M. D. WILSON (UK) The Impact of Foodcrop Production on Sustained Livestock Production in Semi-arid Regions of Kenya 339 A. W. MUKHEBI (Kenya), H. C. KNIPSCHEE&R G .S ULLIVAN (USA) Book Reviews 353 Number 4 Small Farmer Development: Experiences of Commonwealth Developing Countries 361 M. HASSANULLAH (Bangladesh) Comparative Analysis of the Village Ecosystem Function of Different Tribes Living in the Same Area in Arunachal Pradesh in North-eastern India . 377 R. K. MAIKHURI & P. S. RAMAKRISHNAN (India) Evaluation of Four Simulation Models of Cattle Growth and Body Composition: Part I—Comparison and Characterization of the Models 401 R. N. ARNOLD & G. L. BENNETT (USA) An Analysis of the Marginal Value of Cropland and Nitrogen Fertilizer Use Under Alternative Farm Programs . 433 WEN-YUAN HUANG & NOEL D. URI (USA) ISFARM: An Integrated System for Farm Management: Part I—Methodology. 455 I. AMIR (Israel), J. PUECH & J. GRANIER (France) Book Reviews 471