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Bacillus Pumilus Strain TUAT-1 and Nitrogen Application in Nursery Phase Promote Growth of Rice Plants under Field Conditions

1
Faculty of Agriculture, Tokyo University of Agriculture and Technology, Saiwaicho 3-5-8, Fuchu, Tokyo 183-8509, Japan
2
Institute of Agriculture, Tokyo University of Agriculture and Technology, Saiwaicho 3-5-8, Fuchu, Tokyo 183-8509, Japan
*
Author to whom correspondence should be addressed.
Current Address (K.T.W.): Central Region Agricultural Research Center, National Agriculture and Food Research Organization (NARO), Tsukuba, Kanondai 2-1-18, Ibaraki 305-8666, Japan.
Current Address (A.Z.O.): Natural Science Research Unit, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan.
Agronomy 2018, 8(10), 216; https://doi.org/10.3390/agronomy8100216
Received: 24 August 2018 / Revised: 28 September 2018 / Accepted: 1 October 2018 / Published: 4 October 2018
(This article belongs to the Special Issue Fertilizer Application on Crop Yield)
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Abstract

The aims of this study were to boost growth attributes, yield, and nutrient uptake of rice in paddy fields using a combination of Bacillus pumilus strain TUAT-1 biofertilizer and different nitrogen (N) application rates in nursery boxes. Bacillus pumilus strain TUAT-1 was applied as an inoculant biofertilizer in conjunction with different rates of N fertilizer to rice seedlings in a nursery. Plant growth and yield parameters were evaluated at two stages: in 21-day-old nursery seedlings and in mature rice plants growing in a paddy field. Inoculation with TUAT-1 significantly increased the seedling growth and root morphology of 21-day-old nursery seedlings. There was a marked increase in chlorophyll content, plant height, number of tillers, and tiller biomass of rice plants with the use of TUAT-1 and N fertilizers alone, and their combinations, at the maximum tillering stage in the field. The combination of TUAT-1 and 100% N (farmer recommended rate of N) resulted in the greatest tiller number and biomass at the maximum tillering stage, and positively affected other growth attributes and yield. The growth and yield were similar in the TUAT-1 + 50% N and 100% N (uninoculated) treatments, because TUAT-1 promoted root development, which increased nutrient uptake from the soil. These results suggest that the B. pumilus strain TUAT-1 has a potential to enhance the nutritional uptake of rice by promoting the growth and development of roots. View Full-Text
Keywords: biofertilizer; Bacillus pumilus; growth promotion; N fertilizer; rice; yield biofertilizer; Bacillus pumilus; growth promotion; N fertilizer; rice; yield
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Win, K.T.; Oo, A.Z.; Ohkama-Ohtsu, N.; Yokoyama, T. Bacillus Pumilus Strain TUAT-1 and Nitrogen Application in Nursery Phase Promote Growth of Rice Plants under Field Conditions. Agronomy 2018, 8, 216.

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