Premium
Greenhouse Evaluation of Elemental Sulfur and Gypsum for Flooded Rice
Author(s) -
Chien S. H.,
Hellums D. T.,
Henao J.
Publication year - 1987
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1987.03615995005100010026x
Subject(s) - gypsum , loam , elemental analysis , urea , sulfur , agronomy , yield (engineering) , chemistry , mathematics , soil water , environmental science , materials science , metallurgy , soil science , organic chemistry , biology
Abstract Recently, S deficiency has become a problem in many flooded soils for rice ( Oryza sativa L.) production because of the increased use of high‐analysis of N and P fertilizers that do not contain S. The objective of this study was to compare the relative agronomic effectiveness (RAE) of powdered elemental S and urea‐S melt (prilled or powdered) to that of gypsum in a pot trial using an S‐deficient Josephine soil (fine‐loamy, mixed mesic, Typic Haplozerults). The RAE value of powdered elemental S for grain yield was 78% with respect to gypsum when both fertilizers were surface broadcast onto the soil surface at rates up to 40 mg S kg −1 . Prilled urea‐S melt was found to be significantly less effective than powdered urea‐S melt in terms of increasing rice grain yield at a rate of 20 mg kg −1 . Placement of urea had no effect on rice response to elemental S for a given S placement method. The various S placement methods demonstrated the following order of agronomic effectiveness of elemental S: surface broadcast = incorporation > deep placement. Rice response to gypsum, on the other hand, was found to be the same, irrespective of placement method. Prilled urea‐S melt was approximately 61% as effective as gypsum in increasing rice grain yield when incorporated into the soil at 20 mg S kg −1 .