Nitrogen in soybean: physiological quality of seeds
The objective of this study was to evaluate the yield and physiological quality components of soybean seeds grown with application of different doses and times of application of nitrogen. The completely randomized design, in a 4x2 factorial scheme (four nitrogen doses and two application times) with four repetitions. The application of nitrogen was done in the form of urea (45% N), in the doses of 0, 25, 50 e 75 kg N ha- 1 during sowing and at the R4 stage of the culture. The number of pods per plant, the number of seeds per plant, the mass of a thousand seeds, first germination count, percentage of germination, dry mass of aerial part and root were evaluated. The application of nitrogen positively influenced the parameters of soybean yield at the dose of 75 kg N ha-1 during grain filling. During sowing, the dose of 25 kg N ha-1 resulted in higher averages of the dry mass of aerial part, 50 kg N ha-1 increased the mass of one thousand grains and dry root mass and the application of 75 kg N ha-1 at sowing during the first harvest obtained positive results for the first germination and germination count. For the results of the second crop, the application of 50 kg N ha-1 at sowing provided an increase in the first germination count.
| Main Authors: | , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Facultad de Ciencias Agrarias y Forestales de la Universidad Nacional de La Plata
2021
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| Online Access: | https://revistas.unlp.edu.ar/revagro/article/view/12215 |
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| Summary: | The objective of this study was to evaluate the yield and physiological quality components of soybean seeds grown with application of different doses and times of application of nitrogen. The completely randomized design, in a 4x2 factorial scheme (four nitrogen doses and two application times) with four repetitions. The application of nitrogen was done in the form of urea (45% N), in the doses of 0, 25, 50 e 75 kg N ha- 1 during sowing and at the R4 stage of the culture. The number of pods per plant, the number of seeds per plant, the mass of a thousand seeds, first germination count, percentage of germination, dry mass of aerial part and root were evaluated. The application of nitrogen positively influenced the parameters of soybean yield at the dose of 75 kg N ha-1 during grain filling. During sowing, the dose of 25 kg N ha-1 resulted in higher averages of the dry mass of aerial part, 50 kg N ha-1 increased the mass of one thousand grains and dry root mass and the application of 75 kg N ha-1 at sowing during the first harvest obtained positive results for the first germination and germination count. For the results of the second crop, the application of 50 kg N ha-1 at sowing provided an increase in the first germination count. |
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