Seeding Rate and Nitrogen Management Effects on Spring Wheat Yield and Yield Components

Abstract

Seeding rate, N level, and N application timing are key management factors for spring wheat (Triticum aestivum L.) production in North Dakota. Experiments were conducted under dryland (Casselton, ND) and irrigated (Carrington, ND) conditions in 2003 to 2005 to determine the optimum combination of seeding rate and N management to maximize yield of hard red spring wheat (HRSW). Treatments consisted of a factorial combination of HRSW genotypes ('Briggs', 'Alsen', 'Granite', and ND 740), seeding rates (2.9 and 4.2 million seeds ha 21 ), N levels (140 and 224 kg ha 21 for the dryland site; 168 and 280 kg ha 21 for the irrigated site), and N application timing (preplant, two-split, and three-split). Nitrogen level, N timing, and seeding rate showed no significant effect on grain yield across environments. However, genotype significantly influenced grain yield. Increasing seeding rate failed to increase grain yield of the three cultivars, but ND 740 was most productive at the lowest seeding rate. Increasing the level of N significantly increased grain protein content (GPC) over all environments. Grain volume weight (GVW) and thousand kernel weight (TKW) decreased with increasing N level and were influenced by genotype. Increased seeding rate significantly increased plant stand and tiller number while increasing N levels significantly increased head count. These data indicate that although genotype was the primary factor in determining grain yield, GPC, and agronomic traits, individual genotypes responded differently to varying seeding rates and N management practices.

Response of Bread Wheat (Triticum aestivum L.) Varieties to Seeding Rates at Kulumsa, South Eastern Ethiopia

“…Variety Shorima produced the longest spike length of 10.5 cm while, variety Digalu produced the shortest spike length of 6.47 cm ( Table 1). This result was in agreement with that of Otteson et al (2007) who reported that individual genotypes responded differently to spike length for varying seeding rates in wheat. In the case of seed rate, the plot treated with 125 kg haG 1 produced the longest spike length (9.12 cm) and seed rate of 200 kg haG 1 produced the shortest spike length (8.4 cm).…”

“…This could be due to its longest spike length of 10.5 cm, which plays a vital role in wheat on the number of grains per spike and finally the yield (Shahzad et al, 2007). Except for variety Digalu, the result of this study was in agreement with Kumar et al (2006) and Otteson et al (2007) who reported that increasing sowing rates with optimum fertilizer application resulted in increased grain yield, NPK uptake, spike number, number of grains per spike and grain yield with increasing seed rates up to 150 kg haG 1 . Furthermore, Baloch et al (2002) reported that the use of 150 kg seed haG 1 produced higher grain yield of 5103.3 kg haG 1 than other seeding rates (100, 125, 175 and 200 kg haG 1 ) used.…”

Effect of seeding rate on grain quality of winter wheat

“…They pointed out that seeding rate is a predictable environmental factor that affects some agronomic and enduse quality traits of wheat; therefore, it should be studied carefully to obtain higher grain yields with better end-use quality. Lloveras et al (2004) and Otteson et al (2007) established that kernel weight was significantly affected by environment and variety, but not by seeding rate.…”

Photoperiod Response Gene Ppd‐D1 Affects Nitrogen Use Efficiency in Soft Red Winter Wheat

“…Upon analysis of wheat lines in two contrasting photoperiod groups, it was discovered that wheat lines containing the photoperiod sensitivity allele (Ppd-D1b) conferred a significant (P < 0.05) yield advantage under N-limited conditions in Ohio and across N treatments in half of the Virginia testing environments. For instance, in an investigation of hard red spring wheat in the Northern Great Plains of the United States, N applied before the five-leaf stage resulted in greater tiller production than an equally split N application of the same rate at preplant, the five-leaf stage, and postanthesis, but the increased tiller number did not translate into a significant increase in grain yield (Otteson et al, 2007). However, wheat genotypes in the photoperiod-insensitive allelic group had significantly higher (P < 0.05) grain N concentration in all Virginia testing sites.…”