Field Evaluation of Ammonium Sulfate versus Two Fertilizer Products Containing Ammonium Sulfate and Elemental Sulfur on Soybeans
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS(2019)
摘要
Two separate field trials comparing three different commercial sulfur (S) fertilizers were conducted in 2016 and 2017, respectively, to evaluate their initial agronomic effectiveness in increasing soybean grain yield. The S compounds of these products were elemental S (ES) and ammonium sulfate (AS). The fertilizer sources were (1) AS, (2) granular MAP-10 S (5% ES + 5% AS-S) and (3) bulk-blend (bentonite-ES) + (AS) containing 25% ES + 25% AS-S. Rates of total S applied were 0, 5.6, 11.2, 22.4 and 33.6 kg S ha(-1). A significant S response in grain yield was observed with all S sources. The grain yield was significantly higher with AS than with the other two S sources at S rates <= 22.4 kg S ha(-1) of total S applied but equal for all sources above this rate. All data points for the three S sources followed the same S response function based on a quadratic plateau model when the grain yield was plotted versus AS-S rate applied. This suggests that there was no significant ES oxidation from MAP-10S and (ES) + (AS) products to provide soybean crop growth to maturity. The experimentally observed AS-S rate at which the maximum grain yield was attained in the 2 years of fieldwork was 11.2 kg S ha(-1) while the calculated average AS-S rate based on a quadratic plateau model was 13.4 kg S ha(-1).
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关键词
Sulfur,fertilizers,soil fertility,plant nutrition
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