phosphorus fertilizers | Ag Data Commons

Sweet corn response to banded phosphorus in the Willamette Valley

Six field experiments were conducted during 2012 and 2013 in the Willamette Valley, OR to evaluate corn ear yield and quality response to starter P fertilizer and whether current Oregon State University recommendations for starter P application are supported by recent data with contemporary corn varieties and production practices. While yield was not impacted by starter P fertilizer addition at any site-year, visual symptoms of P deficiency were observed at the site with the lowest soil test P value (42 mg kg-1). This research supports a 50 mg kg-1 P sufficiency threshold for modern sweet corn varieties.

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Soybean Yield Response to Fertilizer-Phosphorus Rate on Soils having different Mehlich-3 Phosphorus Values in Arkansas

Soybean response to fertilizer-phosphorus (P) fertilization experiments were conducted at 39 sites in Arkansas from 2004-2018 with the main objective of developing data to correlate and calibrate fertilizer-P rate recommendations for irrigated soybean [Glycine max (L.) Merr.] in Arkansas. The dataset includes information for 39 site-years representing eight eastern Arkansas counties including Arkansas (4), Clay (1), Cross (3), Desha (2), Lee (4), Poinsett (9), St. Francis (15), and Woodruff (1).

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Comparison of four extractants used in soil phosphorus and potassium testing for two soils in a corn-wheat-soybean rotation in Tennessee receiving various amounts of P and K fertilizer

These soil samples are from field experiments initiated in 2009. There were two separate fertilizer rate trials at each location, one for P and one for K, and each was implemented in a corn-winter wheat-soybean rotation. The soils used in this study are from University of Tennessee (UT)’s Research and Education Center at Milan (35.9, -88.73333) and UT’s Highland Rim Research and Education Center at Springfield (36.466667, -86.816667).

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