Abstract
Preparation of rice seedlings on fl oating seedbed makes it possible for earlier rice growing season and more fl exible time for transplanting under unpredictable fl ooding condition. The objective of this research was to search for appropriate procedure for producing high quality rice seedlings using fl oating seedbed associated with three crucial factors, i.e. level of contact between substrate and water surface, seedling population density, and seedling age at time of transplanting. Seedbeds were constructed using 120 air-tight plastic bottles as fl oater. Surface dimension of the seedbed was 2 x 1 m with load capacity of 40 kg m-2; therefore, each seedbed can be loaded with 80 kg of growing substrate. Three experiments were sequentially carried out for optimizing knowledge on each of the three crucial factors. Seedling height, fresh weight, and SPAD value were used as primary indicators for seedling quality. Results of our experiments indicated that seedling height and weights were consistently lower in partially submerged substrate than those in no direct contact or with fi lm-thin contact setups. Seedling population density between seed application rates of 2 and 3 kg m-2 were not signifi cantly different, but these treatments were signifi cantly higher than that of application rate at 1 kg m-2. SPAD value was higher at denser seed application rates. Optimum seedling age was 21 DAP but acceptable range for transplanting was at ages between 14 and 28 DAP. Thus, open fl exibility for time of transplanting during fl oodwater receding process.
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Claims 7
Claim · model-written summary
Rice seedling height and fresh weight were lower on partially submerged substrate than with no direct contact of the substrate with water.
- Taxon
- rice
Oryza sativat0 - Treatment
- partially submerged substratee1
- Outcome
- seedling height and weightse1
- Direction
- lowere1
- Comparator
- no direct contacte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e1“seedling height and weights were consistently lower in partially submerged substrate”
e2“than those in no direct contact”
Claim · model-written summary
Rice seedling population density was higher at seed application rates of 2 and 3 kg m-2 than at 1 kg m-2.
- Taxon
- riceOryza sativat0
- Treatment
- seed application rates of 2 and 3 kg m-2e3
- Outcome
- Seedling population densitye3
- Direction
- highere4
- Comparator
- application rate at 1 kg m-2e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e3“Seedling population density between seed application rates of 2 and 3 kg m-2”
e4“higher than that of application rate at 1 kg m-2”
Claim · model-written summary
Rice seedling population density did not differ between seed application rates of 2 and 3 kg m-2.
- Taxon
- riceOryza sativat0
- Treatment
- seed application rates of 2 and 3 kg m-2e3
- Outcome
- Seedling population densitye3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e3“Seedling population density between seed application rates of 2 and 3 kg m-2”
Claim · model-written summary
Rice SPAD value was higher at denser seed application rates.
- Taxon
- riceOryza sativat0
- Treatment
- denser seed application ratese5
- Outcome
- SPAD valuee5
- Direction
- highere5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e5“SPAD value was higher at denser seed application rates”
Claim · model-written summary
Optimum rice seedling age at transplanting was 21 days after planting.
- Taxon
- riceOryza sativat0
- Outcome
- seedling agee6
- Value
- 21 DAPe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e6“Optimum seedling age was 21 DAP”
Claim · model-written summary
The acceptable range of rice seedling age for transplanting was 14 to 28 days after planting.
- Taxon
- riceOryza sativat0
- Outcome
- acceptable range for transplantinge7
- Value
- between 14 and 28 DAPe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e7“acceptable range for transplanting was at ages between 14 and 28 DAP”
Claim · model-written summary
The floating seedbed opens flexibility in the time of rice transplanting.
- Taxon
- riceOryza sativat0
- Outcome
- time of transplantinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Floating seedbed for preparing rice seedlings”
e7“for time of transplanting”
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