Abstract
As reported by many agronomists, the direct seeding cultivation of rice is thought to be an effective way to reduce the cost of rice production in Japan. However, the rice yield of direct seeding cultivation is generally lower and unstable compared with that from transplanting cultivation. This is mainly due to the unstable establishment of rice seedlings and slow growth during the early growing stage. The two reasons mentioned above are correlated with an appropriate control of water depth under changing weather conditions.This report describes an automatic irrigation system based on the rice microclimate prediction model (Inoue, 1985). This irrigation system can appropriately control water depth and accordingly the microclimate of direct seeding rice fields using weather data and rice plant data. The feasibility tests of this system were done at two direct seeding rice fields at Yuza-machi, Yamagata Prefecture in 1995 and at Yawara-mura, Ibaraki Prefecture in 1997, respectively.The results obtained from the above two experiments can be summarized as follows:The newly developed automatic irrigation system showed good performance in controlling the water depth of direct seeding rice fields during the whole rice growing season. The brown rice yield from the field controlled by this system was 562kg/10a, while neighboring direct seeding rice fields, in which the water depth was controlled manuall, had yields of 492kg/10a and 505kg/10a in 1997. The plant height of the test field with the automatic irrigation system was about 75cm, compared to about 70cm in neighboring direct seeding cultures.These results show that the newly developed automatic irrigation system was effective in stabilizing the establishment and emergence of rice seedlings, and in promoting subsequent growth in direct seeding cultures.
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Claims 5
Claim · model-written summary
The system controlled water depth well through the rice season.
- Taxon
- rice
Oryza sativae0 - Outcome
- controlling the water depthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“newly developed automatic irrigation system showed good performance in controlling the water depth of direct seeding rice fields during the whole rice growing season”
Claim · model-written summary
Automatic irrigation yielded 562kg/10a versus 492kg/10a and 505kg/10a in manually controlled neighboring fields.
- Taxon
- riceOryza sativae0
- Treatment
- controlled by this systeme0
- Outcome
- brown rice yielde0
- Value
- 562kg/10ae0
- Qualifier
- 492kg/10a and 505kg/10ae0
- Comparator
- water depth was controlled manualle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brown rice yield from the field controlled by this system was 562kg/10a, while neighboring direct seeding rice fields, in which the water depth was controlled manuall, had yields of 492kg/10a and 505kg/10a in 1997”
Claim · model-written summary
Plant height under automatic irrigation was about 75cm versus about 70cm in neighboring direct-seeded fields.
- Taxon
- plante0
- Treatment
- automatic irrigation systeme0
- Outcome
- plant heighte0
- Value
- about 75cme0
- Qualifier
- about 70cme0
- Comparator
- neighboring direct seeding culturese0
Not reportedDirection
Verbatim
e0“plant height of the test field with the automatic irrigation system was about 75cm, compared to about 70cm in neighboring direct seeding cultures”
Claim · model-written summary
The system stabilized rice seedling establishment and emergence.
- Taxon
- riceOryza sativae0
- Outcome
- establishment and emergencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“newly developed automatic irrigation system was effective in stabilizing the establishment and emergence of rice seedlings”
Claim · model-written summary
The system promoted subsequent growth in direct-seeded rice.
- Taxon
- RiceOryza sativat0
- Outcome
- subsequent growthe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“promoting subsequent growth in direct seeding cultures”
t0“Rice”
The same questions in other papers
irrigation · growth · Oryza sativa (rice)Positive and negative results
221 papers in the same direction as this paper · 62 in the opposite direction · 7 reporting no difference from an alternative
- negative
- negative
- negative
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See all 291 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.