HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (19) Citing Articles via Google Scholar Google Scholar Articles by Muir, J. P. Articles by Reed, R. L. Search for Related Content PubMed Articles by Muir, J. P. Articles by Reed, R. L. Agricola Articles by Muir, J. P. Articles by Reed, R. L. Related Collections Forage Management Other Forage Crops

Biomass Production of ‘Alamo’ Switchgrass in Response to Nitrogen, Phosphorus, and Row Spacing

^a Texas A&M Univ. Agric. Res. and Ext. Cent., Route 2, Box 00, Stephenville, TX 76401
^b USDA-ARS, Pasture Syst. and Watershed Manage. Res. Unit, Bldg. 3702, Curtin Rd., University Park, PA 16802-3702
^c Texas A&M Univ. Agric. Res. Stn., Beeville, TX
^d San Angelo State Univ., San Angelo, TX

View larger version (24K): [in a new window]   Fig. 1. Biomass production response of Alamo switchgrass to N fertilizer during 7 yr at Stephenville, TX. Regression equations were Y = 22x + 6528, r2 = 0.43, and root mean square error (RMSE) = 2220 for 1992; Y = -0.19x2 + 110x + 3782, r2 = 0.86, and RMSE = 2369 for 1993; Y = -0.34x2 + 111x + 4492, r2 = 0.81, and RMSE = 1695 for 1994; Y = -0.61x2 + 208x + 4240, r2 = 0.85, and RMSE = 2948 for 1995; Y = -0.27x2 + 129x + 2433, r2 = 0.88, and RMSE = 2248 for 1996; Y = -0.22x2 + 124x + 2743, r2 = 0.94, and RMSE = 1666 for 1997; and Y = -0.07x2 + 67x + 1304, r2 = 0.91, and RMSE = 1394 for 1998.

View larger version (19K): [in a new window]   Fig. 2. Relationship between annual biomass production of Alamo switchgrass and seasonal rainfall (March–August) for 1994 to 1998 at Stephenville, TX. R2 values for the 0, 56, and 224 kg N ha-1 rates were 0.56, 0.82, and 0.68, respectively.

View larger version (28K): [in a new window]   Fig. 3. Tiller density in switchgrass plots as affected by N rate and row spacing at Stephenville, TX during 1993 to 1996.

View larger version (27K): [in a new window]   Fig. 4. Tiller mass of switchgrass as affected by N rate and row spacing at Stephenville, TX during 1993 to 1996.

View larger version (30K): [in a new window]   Fig. 5. Biomass production response of Alamo switchgrass to N fertilizer and row spacing during 3 yr at Beeville, TX.