Rice Seeding and Nitrogen Rate Effects on Yield and Yield Components of Two Rice Cultivars

Field research was conducted for 2 yr to investigate the relationship between rice (Oryza sativa L.) seeding rate and preflood nitrogen (N) rate utilizing long-grain rice cultivars planted into clay and silt loam soils. Rice cultivars included 'Cheniere' and 'Wells' seeded at 162, 323, and 646 seeds m -2 . Nitrogen was applied before flooding at 67, 134, and 202 kg ha -1 . No response to soil texture and no interaction between seeding rate and N rate were detected for the parameters examined. The lowest applied N rate had lower yield than the other two N rates. Rough rice yields were 7564 for 67 kg N ha, 8520 for 134 kg N ha -1 , and 9000 for 202 kg N ha -1 averaged over all cultivars, seeding rates, and soil textures. Similarly, when head rice yield was pooled across soil texture and seeding rate, head rice yield of Cheniere was independent of N rate, but head rice yield of Wells increased when the N rate was increased from 67 to 202 kg ha -1 . Panicle density responded to N rate similar to rough rice yield. Panicle density increased with seeding rate up to 418 panicles m -2 at a seeding rate of 646 seeds m -2 . Filled grain panicle -1 was highest at a seeding rate of 162 seeds m -2 . Cheniere produced more filled grain panicle -1 while Wells had a higher 1000-grain weight. Grain yield and yield components of Cheniere and Wells respond to seeding rates and N rates independently when planted into clay or silt loam soils.

[1]  D. Groth,et al.  Registration of ‘Cheniere’ Rice , 2006 .

[2]  N. Fageria,et al.  Response of lowland rice and common bean grown in rotation to soil fertility levels on a Varzea soil , 2004, Fertilizer research.

[3]  Valmir Gaedke Menezes,et al.  Resposta de duas cultivares de arroz irrigado à densidade de semeadura e à adubação nitrogenada , 2003 .

[4]  N. Fageria,et al.  LOWLAND RICE RESPONSE TO NITROGEN FERTILIZATION , 2001 .

[5]  R. Norman,et al.  Nitrogen Application Timing Effects on Nitrogen Efficiency of Dry-Seeded Rice , 1998 .

[6]  A. McClung,et al.  Contribution of Rice Tillers to Dry Matter Accumulation and Yield , 1998 .

[7]  C. Lindau,et al.  Rice variety differences in dry matter and nitrogen accumulation as related to plant stature and maturity group , 1997 .

[8]  J. Ladha,et al.  Tillage Depth Influence on Soil Nitrogen Distribution and Availability in a Rice Lowland , 1996 .

[9]  R. S. Helms,et al.  Seeding rate effects on rough rice yield, head rice, and total milled rice , 1996 .

[10]  R. Norman,et al.  Cultivar and Nitrogen Rate Influence on Nitrogen Uptake and Partitioning in Rice , 1994 .

[11]  S. M. Dofing,et al.  Yield component compensation in uniculm barley lines , 1994 .

[12]  R. Norman,et al.  Management of fertiliser nitrogen in dry-seeded, delayed-flood rice , 1994 .

[13]  S. Geng,et al.  Effect of nitrogen and harvest grain moisture on head rice yield , 1993 .

[14]  P. Counce,et al.  Yield and Harvest‐Index Responses to Preflood Nitrogen Fertilization at Low Rice Plant Populations , 1992 .

[15]  R. S. Helms,et al.  Path analysis of rice yield and yield components as affected by seeding rate , 1992 .

[16]  B. Miller,et al.  Plant Population Effects on Growth and Yield in Water-Seeded Rice , 1991 .

[17]  M. Dingkuhn,et al.  Nitrogen fertilization of direct-seeded flooded vs. transplanted rice. I, Nitrogen uptake, photosynthesis, growth, and yield , 1990 .

[18]  P. Counce,et al.  Rice plant population density effect on early-season nitrogen requirement , 1990 .

[19]  R. Norman,et al.  Effect of Application Method and Dicyandiamide on Urea‐Nitrogen‐15 Recovery in Rice , 1989 .

[20]  J. Dixon,et al.  Ammonium Fixation by High-Charge Smectite in Selected Texas Gulf Coast Soils , 1989 .

[21]  S. G. Carmer,et al.  Least significant differences for combined analyses of experiments with two- or three-factor treatment designs , 1989 .

[22]  P. Counce.  Asymptotic and Parabolic Yield and Linear Nutrient Content Responses to Rice Population Density1 , 1987 .

[23]  F. J. Stevenson,et al.  Distribution and Recovery of Nitrogen‐15‐labeled Liquid Anhydrous Ammonia Among Various Soil Fractions , 1987 .

[24]  G. Snyder,et al.  Seeding rate and row spacing effects on yield and yield components of drill-seeded rice , 1987 .

[25]  W. H. Patrick,et al.  Effects of seeding method and time of fertilization on urea nitrogen 15 recovery in rice oryza sativa cultivar lemont , 1986 .

[26]  S. K. De Datta,et al.  Improving nitrogen fertilizer efficiency in lowland rice in tropical Asia , 1986 .

[27]  B. Wells,et al.  Short‐statured Rice Response to Seeding and N Rates1 , 1978 .

[28]  B. Wells,et al.  Differential Response of Rice Varieties to Timing of Mid‐season Nitrogen Applications1 , 1970 .