Effect of the Nitrification Inhibitor 3,4-Dimethylpyrazole Phosphate on the Deep Placement of Nitrogen Fertilizers for Soybean Cultivation | Chapter 02 | Research and Development in Agricultural Sciences Vol. 1
The deep placement of urea fertilizer
(DMU) containing 1% (W/W) of the nitrification inhibitor 3,4- dimethylpyrazole
phosphate (DMPP) on soybean growth and seed yield was as effective as those of
the coated urea (CU) and lime nitrogen (LN) in a field research. The average
seed yields were high in LN (464 g•m−2) and DMU (461 g•m−2)
and relatively low in CU (405 g•m−2), U (396 g•m−2), and
Cont (373 g•m−2) treatments. The accumulations of dry matter and
nitrogen in soybean shoots were higher in the plants with deep placement of CU,
LN and DMU than U and Cont. The daily nitrogen fixation activity and daily
nitrogen absorption rate were calculated based on the relative ureide method.
Both nitrogen fixation activity and nitrogen absorption rate were higher in DMU,
CU, and LN compared with control treatment, suggesting that the deep placement
of DMU did not repress nitrogen fixation. Soil incubation test was performed
using the same field soil with DMU, U, LN, and urea with DMPP 1%, 2%, and 4%.
DMU inhibits nitrification similar to the pattern of LN until 8 weeks. The
increasing DMPP concentration did not markedly increase the nitrification
inhibition. From these results, it was concluded that urea fertilizer with 1%
DMPP is efficient for deep placement of N fertilizer for soybean cultivation
due to its lower price compared with CU and LN.
Author(s) Details
Takuji Ohyama
Graduate School of Science
and Technology, Niigata University, Niigata 950-2181, Japan and Faculty of
Applied Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan.
Soshi Hatano
Graduate School of Science
and Technology, Niigata University, Niigata 950-2181, Japan.
Yoichi Fujita
Niigata Agricultural
Research Institute, Crop Research Center, Niigata 940-0826, Japan.
Yoshifumi Nagumo
Niigata Agricultural
Research Institute, Crop Research Center, Niigata 940-0826, Japan.
Norikuni Ohtake
Graduate School of Science
and Technology, Niigata University, Niigata 950-2181, Japan.
Kuni Sueyoshi
Graduate School of Science
and Technology, Niigata University, Niigata 950-2181, Japan.
Yoshihiko Takahashi
Graduate School of Science
and Technology, Niigata University, Niigata 950-2181, Japan.
Takashi Sato
Faculty of Bioresource
Sciences, Akita Prefectural University, Akita 015-0055, Japan.
Sayuri Tanabata
College of Agriculture,
Ibaraki University, Ibaraki 300-0332, Japan.
Kyoko Higuchi
Faculty of Applied
Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan.
Akihiro Saito
Faculty of Applied
Biosciences, Tokyo University of Agriculture, Tokyo 156-8502, Japan.
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