2019
Phosphorus Fertilizer Management Decisions for Soybean Based on Time of Planting (2019
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Contributor/Checkoff:
North Dakota Soybean Council
Category:
Sustainable Production
Keywords:
GeneticsGenomicsSeed quality
Parent Project:
Phosphorus Fertilizer Management Decisions for Soybean Based on Time of Planting
Lead Principal Investigator:
Jasper M. Teboh, North Dakota State University, Carrington Research Extension Center
Co-Principal Investigators:
Project Code:
QSSB
Contributing Organization (Checkoff):
North Dakota Soybean Council
$15,820
Institution Funded:
North Dakota State University, Carrington Research Extension Center
$15,820
Brief Project Summary:

Phosphorus fertilization adds to the cost of soybean production. Sometimes yield gains from P fertilization are dependent on low available soil P, and even when P is low, its application does not result in significant yield gains. This needs further verification, since the crop may require P to minimize stress due to late planting, and that yields are better from P for early planted beans than later planting. Three trials were conducted to evaluate the effect of phosphorus (P) fertilization of soybeans planted at three dates, and to determine if it is economical to fertilize soybeans with P.

Key Benefactors:
farmers, agronomists, applicators, extension specialists

Information And Results
Final Project Results

Research Conducted
Three trials were conducted at Carrington (CREC) and Oakes to evaluate the effect of phosphorus (P) fertilization of soybeans planted at three different dates, and to determine from these results if it was economical to fertilize soybeans with P. Description of the three planting dates used were early (May 14), normal (May 24), and late (June 5) at CREC, and early (May 11), normal (May 24), and late (June 8) at Oakes. These dates fall within the range of average early, normal, or late planting in North Dakota.

Why the research is important to ND soybean farmers
Phosphorus fertilization adds to the cost of production of soybeans. What is sometimes not realized is that yield gains from P fertilization are dependent on low available soil P; and even when P is sometimes low, application of P does not result in yield any significant yield gains due to improved availability from mineralization. In addition, the notion that soybean yield response to P is very likely for early planted soybeans has needs further verification, since the crop may require P to minimize adverse stressed on the crop due to late planting, and there has not been any extensive research in North Dakota that verifies that yields are better from P addition for early planted beans than later planting.

Final findings of the research
Phosphorus was applied and incorporated before planting. Phosphorus did not improve yields at all three sites. Planting dates significantly affected yields at Carrington under dryland but not under irrigation. At Oakes, yields were also not impacted by planting dates. It is probable that, adequate moisture and temperature, and long season of growth were important for the two irrigated trials, thereby minimizing the negative impact of late planting. Based on the soil test levels at CREC irrigated site (3 ppm), CREC dryland (10 ppm), and Oakes irrigated site (19 ppm), yield response was expected at the irrigated site, probable at the dryland site, and not expected at Oakes. If farmers are applying P with the aim of increasing soybean yields, response will likely not to be inconsistent.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.