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Grain Yield and Kernel Smut of Rice as Affected by Preflood and Midseason Nitrogen Fertilization in Arkansas

^a Dep. of Crop, Soil, and Environ. Sci., 1366 W. Altheimer Drive, Fayetteville, AR 72704
^b Agric. Stat. Lab., Univ. of Arkansas, Fayetteville, AR 72701
^c Univ. of Arkansas Coop. Ext. Serv., 2301 S. University, Little Rock, AR 72203
^d Dep. of Crop, Soil, and Environ. Sci., 115 Plant Science Bldg., Fayetteville, AR 72701

View larger version (31K): [in a new window]   Fig. 1. Effect of (A) preflood and (B) midseason N rate on Cocodrie or LaGrue rice grain yields in five studies conducted at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC) during 2001 (01) and 2002 (02). For the environment x preflood N rate interaction (A), the LSD(0.05) values to compare grain yield among preflood N rates within an environment = 372 kg ha–1 and between environments = 382 kg ha–1. For the environment x midseason N rate interaction (B), the LSD(0.05) values to compare grain yield among preflood N rates within an environment = 322 kg ha–1 and between environments = 333 kg ha–1.

View larger version (30K): [in a new window]   Fig. 2. Effect of preflood N rate, averaged across midseason N rates, on the (A) incidence and (B) severity of kernel smut of Cocodrie or LaGrue rice in five studies conducted at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC) during 2001 (01) and 2002 (02). For the environment x preflood N rate interaction on incidence (A), the LSD(0.05) values to compare incidence among preflood N rates within an environment = 8.5% and between environments = 10.5%. For the environment x preflood N rate interaction on severity (B), the LSD(0.05) values to compare severity among preflood N rates within an environment = 0.5% and between environments = 0.7%.

View larger version (45K): [in a new window]   Fig. 3. Minimum and maximum air temperatures and precipitation from 1 July to 31 August at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC) during 2001 and 2002. Precipitation amounts >40 mm were entered as 40 mm. Temperature data were obtained from the NCDC (2003) for weather stations located at Wynne, AR (temperature data only), and Stuttgart 9ESE, AR (temperature and precipitation). At the PTBS, precipitation was recorded on site during 2001 and 2002.