Nitrogen-sulfur interactions in rice
1987
Blair, G.J.
There are many similarities in the N and S cycles in rice cropping systems, but changes in fertilizer use patterns are changing the magnitude of the N and S inputs. The move to urea, diammonium phosphate, monoammonium phosphate, and triple superphosphate has significantly decreased S inputs. In addition, increased cropping intensity and changes in straw management have important implications for both N and S. Experimental evidence suggests that fertilizer N efficiency is maximized by deep placement whereas S responses are greatest where it is surface broadcast. A set of diagnostic criteria based on total S, total N, and N/S ratio for whole tops sampled at maximum tillering is presented.
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