101853 Status of Sulfur in Pennsylvania Corn Production.
Poster Number 468-503
See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Fertilizer & Lime Responses 1
Wednesday, November 9, 2016
Phoenix Convention Center North, Exhibit Hall CDE
Abstract:
Historically sulfur (S) has not been a fertility concern in Pennsylvania crop production because of significant S deposition in acid rain. A statewide survey of S in crops conducted in 2001 found no evidence of S deficiency. However, there has been a dramatic reduction in S deposition, resulting in a declining trend in soil test S levels, and increasing reports of suspected S deficiency in crops in PA. In 2014 and 2015 a new survey of corn S status was conducted. Extension educators across the state collected plant tissue and soil samples from 78 representative corn fields. Management data was also collected for each field sampled. Median Mehlich 3 soil test S was 18 ppm S, which is very similar to the median S (15 ppm S) for all farmer soil samples submitted to the Ag Analytical Services Lab at Penn State. Median corn earleaf S from the survey was 0.18%. In the survey, 75% of the samples were below the optimum range of 0.2 – 0.5% used in PA. There was a very weak relationship between earleaf S and Mehlich 3 soil test S (r2= 0.12). Approximately one-half of the sites sampled had a history of frequent manure and/or S fertilizer application application. There was a slight trend toward higher earleaf and soil S levels where there was a history of manure or S application. Starting in 2015, S response experiments were conducted at 7 on-farm locations across the state. There was a significant yield response to S (p=0.1) at 4 of 7 locations. Average yield response to S was 13 bu/A. Soil test and plant S were variable, but roughly followed the trend in yield response. Survey and S response experiments are continuing in 2016.
See more from this Division: SSSA Division: Soil Fertility and Plant Nutrition
See more from this Session: Fertilizer & Lime Responses 1
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