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Influence of Placement on Uptake of Tagged Nitrogen by Rice 1
Author(s) -
Broadbent F. E.,
Mikkelsen D. S.
Publication year - 1968
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1968.00021962006000060028x
Subject(s) - ammonium sulfate , tiller (botany) , agronomy , fertilizer , urea , nitrogen , human fertilization , chemistry , yield (engineering) , grain yield , ammonium , cropping system , environmental science , biology , crop , materials science , organic chemistry , chromatography , metallurgy
The placement of two N‐15 tagged fertilizer sources applied to lowland rice was studied to determine the effects on yield components, fertilizer N uptake and the residual N present after cropping. Tiller number and bearing tillers were increased by fertilization, but the source and placement had no effect. Grain yield was increased by N fertilization with ammonium sulfate and urea but was not affected by source. Broadcast applications gave lower yields than other treatments while the highest yields were obtained with half the N placed in the soil and the balance top‐dressed. Fertilizer N in the Y‐leaf and total plant uptake showed the superiority of banding with variations in total N uptake varying from 26 to 47%. Ammonium sulfate provided a larger increment of N to grain production than urea and also showed a lower magnitude of N loss from the soil‐plant system.