A glasshouse evaluation of sulfur fertilizer sources for crops and pastures, 1. Flooded and non-flooded rice
1994
Dana, M. | Lefroy, R.D.B. | Blair, G.J. (New England Univ., Armidale (Australia). Dept. of Agronomy and Soil Science)
Two pot experiments (flooded and non-flooded soil) were conducted with IR-43 rice to evaluate S availability from a range of P-S, N-S and S sources. The reverse dilution 35S technique was used to estimate fertilizer S uptake by the crops following fertilizer application and a second crop grown on residual S. The fertilizers evaluated were gypsum (G), elemental S (E), urea-S melt (US), sulfur-coated urea (SCU), S-coated TSP (HF), S-bentonite (SB) and three S-coated TSP products in which the adhesives were UNE1, UNE2 and UNE3. Highest grain yields in crop 1 were obtained with F, UNE1 and UNE3 under flooded conditions, and G, UNE1, UNE3, SCU and E under non-flooded conditions. Fertiliser S uptake was highest from G under flooded conditions and uptake was higher with UNE1 and UNE3 than E. Under non-flooded conditions, fertilizer S uptake was highest with G and UNE1 followed by UNE3 and E. Yield and fertilizer S uptake in the second crop were generally inversely related to those in crop 1. The results have shown differences between TSP-S products due to the method of bonding of the S coat to the TSP.
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