Diurnal changes in nitrogen and potassium absorption rates of plants grown in a greenhouse
-
- OKUYAMA Yodai
- RECS International Inc.
-
- OZAWA Kiyoshi
- Meiji University, Kurokawa Field Science Center
-
- TAKAGAKI Michiko
- Chiba University
Search this article
Description
In order to increase the efficiency of nutrient utilization in solution culture systems, it is indispensable to understand how plants absorb nutrients. A series of experiments were conducted using hydroponic culture system in the first to third experiments and soil culture system in the fourth experiment in a greenhouse in Okinawa, Japan. In the first experiment, changes in NO3-N absorption were measured every three hours during a 24-hour period on 40 days after transplanting (DAT) in cucumber. In the second experiment, daytime and nighttime NO3-N absorption were measured from 45 to 48 DAT in five crops including cucumber. In the third experiment, NO3-N, NH4-N, and K absorption in daytime, nighttime and shaded conditions were determined from 30 to 34 DAT in bitter gourd, a substitute crop for cucumber, and water spinach. In the fourth experiment, daytime and nighttime (NH4)2SO4-15N absorption rates were measured from 9 to 12 DAT in cucumber. The results showed that daily NO3-N absorption in cucumber peaked twice, just before midday and again just after the nightfall. The corresponding fluctuation pattern was observed in all other tested crops, with 20-41% of the total absorption occurring at night. Absorption rate of 15N in cucumber cultivated in soil also increased in daytime and decreased at night, with the nighttime rate accounting for 39-40% of the daily total absorption. The average nighttime NO3-N, NH4-N, and K absorption percentages of the daily total before shading the plant were 34-35%, 49-51%, and 33-49%, respectively. During the shaded period, these nutrient absorption rates dramatically decreased, except for NH4-N which was not affected by shading. Across all experiments, 20-51% of total absorption took place at night, the majority of which may concentrate around the early nighttime. Furthermore, the absorption rates may be influenced by photosynthetic products.
Journal
-
- Journal of Agricultural Meteorology
-
Journal of Agricultural Meteorology 71 (4), 256-262, 2015
The Society of Agricultural Meteorology of Japan
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390001204669168128
-
- NII Article ID
- 130005130019
-
- NII Book ID
- AN00200732
-
- ISSN
- 18810136
- 00218588
-
- NDL BIB ID
- 026979962
-
- Text Lang
- en
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed