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How Raised Beds and Fe-Chelate Affect Soybean Iron Deficiency Chlorosis and Yield

Agricultural Sciences 2021年第7期12卷 755-768页

作者： Lucas C. Holmes Hans J. Kandel Grant H. Mehring Peder K. Schmitz Department of Plant Sciences North Dakota State University Fargo ND USA westbred Bayer Crop Science Fargo North Dakota USA

Water-logging and the inability to take up sufficient iron (Fe), causing iron deficiency chlorosis (IDC) in soybean (Glycine max, L. Merr.), can be major yield reducing factors in certain soils in the northern USA and Manitoba, Canada, soybean growing regions. The objective of this research was to evaluate soybean IDC, biomass production, and yield with seeding on raised beds and seed application of the Fe-chelate compound ortho-ortho-Fe-EDDHA. In six environments, soybean were seeded on raised beds and conventionally prepared seedbeds (flat) and with a factorial arrangement of five cultivars (within adapted maturity group 0.1 to 0.9 and variable IDC tolerance) and seed applied Fe-EDDHA using rates of 0 kg·ha−1 and 3.36 kg·ha−1. There were no significant interactions between the factors tested. The plant population was 27% higher on the raised beds compared with flat, and yield was 6.3% higher (2893 kg·ha−1 vs. 2722 kg·ha−1). Total dry plant biomass on raised beds was 9.8% greater compared with flat. The plant population with seed applied Fe-EDDHA was 10.6% lower compared with no application. However, the IDC score was significantly lower 2.2 vs 2.4 (1 = green, 5 = dead) for Fe-EDDHA seed application. Yield and plant biomass we

关键词： Soybean Raised Beds Iron Deficiency Chlorosis Fe-Chelate

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A Standardized Method for Determining Tillering Capacity of Wheat Cultivars

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American Journal of Plant Sciences 2020年第5期11卷 604-625页

作者： Jordan D. Stanley Grant H. Mehring Jochum J. Wiersma Joel K. Ransom Syngenta Crop Protection LLC Glyndon Minnesota USA westbred Bayer Crop Science Fargo North Dakota USA Department of Agronomy and Plant Genetics University of Minnesota Crookston Minnesota USA Department of Plant Sciences North Dakota State University Fargo North Dakota USA

Genotype and agronomic management greatly influence crop growth and grain yield in wheat (Triticum aestivum L.). To ensure sustainable production, seeding rate selection is important to maximize efficiency of every plant. Tillering can allow wheat plants to adjust growth relative to plant density and quality of growing conditions. This research sought to determine a method for assessing tillering of wheat cultivars and develop a standardized approach for characterizing cultivar tillering capacity. Nine cultivars with diverse genetic and phenotypic characteristics were seeded in 2017-2018 at Prosper, ND using various seeding techniques at differing plant spacing arrangements to evaluate tillering habit and spikes plant-1. Cultivars grown at population densities common in grower fields did not express full tillering potential. Spaced-plantings of cultivars promoted cultivar expression of tillering phenotype. The SOFATT (seed only a few, and then thin) method, where average spikes plant-1 was determined from multiple plants sampled from a cultivar grown at spaced-plantings (inter-row and intra-row spacing at 30 ± 12 cm), is recommended to properly assess tillering habits of wheat cultivars. Breeders and researchers can use results from SOFATT evaluations to determine tillering capacity rating for each cultivar based on raw or transformed z-score values for spikes plant-1.

关键词： Tillering Capacity Wheat Cultivar Seeding Density Plant Spacing Z-Score

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