Abstract
The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen. The Azolla was incorporated under the rice crop (cv. GRUG 7) grown under irrigation on the vertisol. Within a period of 4 weeks and a doubling time of 5 days, a total biomass of 18 t/ha of Azolla, equivalent to 25 kg N/ha was produced. This is 28 per cent of the optimum recommended nitrogen rate (90 kg N/ha) for rice cultivation on the vertisols of the Accra Plains. Azolla, in combination with 40 kg N/ha ammonium sulphate fertilizer, gave significantly higher grain yields than Azolla only, 60 kg N/ha ammonium sulphate fertilizer and the control plot. No significant grain yield differences were observed between the single and double Azolla incorporations, but the double incorporation of Azolla only gave a yield equivalent to that obtained under 60 kg N/ha ammonium sulphate while a lower yield was observed for the single incorporation. The grain yields were 4.8, 3.5, 2.7 and 1.8 t/ha for the Azolla plus N-fertilizer, 60 kg N/ha, Azolla only and the control plot respeectively. (Ghana Journal of Agricultural Science, 1996, 29(2): 125-129)
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Claims 8
Claim · model-written summary
Azolla green manure produced a total biomass of 18 t/ha for rice, equivalent to 25 kg N/ha.
- Taxon
- rice
Oryza sativat0 - Material
- Azolla pinnata var. africanae0
- Treatment
- green manuree0
- Outcome
- total biomasse1
- Value
- 18 t/hae1
- Qualifier
- equivalent to 25 kg N/hae1
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e1“Within a period of 4 weeks and a doubling time of 5 days, a total biomass of 18 t/ha of Azolla, equivalent to 25 kg N/ha was produced”
Claim · model-written summary
Azolla biomass supplied nitrogen equivalent to 28 per cent of the optimum recommended N rate (90 kg N/ha) for rice.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Outcome
- nitrogen ratee2
- Value
- 28 per cente2
- Comparator
- optimum recommended nitrogen ratee2
- Setting
- Accra Plainse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e2“This is 28 per cent of the optimum recommended nitrogen rate (90 kg N/ha) for rice cultivation on the vertisols of the Accra Plains”
Claim · model-written summary
Azolla with 40 kg N/ha ammonium sulphate gave significantly higher grain yield of rice than Azolla only.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- in combination with 40 kg N/ha ammonium sulphate fertilizere3
- Outcome
- grain yieldse3
- Direction
- significantly highere3
- Comparator
- Azolla onlye3
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e3“Azolla, in combination with 40 kg N/ha ammonium sulphate fertilizer, gave significantly higher grain yields than Azolla only, 60 kg N/ha ammonium sulphate fertilizer and the control plot”
Claim · model-written summary
Azolla with 40 kg N/ha ammonium sulphate gave significantly higher grain yield of rice than 60 kg N/ha ammonium sulphate fertilizer.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- in combination with 40 kg N/ha ammonium sulphate fertilizere3
- Outcome
- grain yieldse3
- Direction
- significantly highere3
- Comparator
- 60 kg N/ha ammonium sulphate fertilizere3
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e3“Azolla, in combination with 40 kg N/ha ammonium sulphate fertilizer, gave significantly higher grain yields than Azolla only, 60 kg N/ha ammonium sulphate fertilizer and the control plot”
Claim · model-written summary
Azolla with 40 kg N/ha ammonium sulphate gave significantly higher grain yield of rice than the control plot.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- in combination with 40 kg N/ha ammonium sulphate fertilizere3
- Outcome
- grain yieldse3
- Direction
- significantly highere3
- Comparator
- the control plote3
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e3“Azolla, in combination with 40 kg N/ha ammonium sulphate fertilizer, gave significantly higher grain yields than Azolla only, 60 kg N/ha ammonium sulphate fertilizer and the control plot”
Claim · model-written summary
Double incorporation of Azolla alone gave a rice grain yield equivalent to that of 60 kg N/ha ammonium sulphate.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- double incorporation of Azolla onlye6
- Outcome
- yielde6
- Direction
- equivalente6
- Comparator
- 60 kg N/ha ammonium sulphatee6
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e6“the double incorporation of Azolla only gave a yield equivalent to that obtained under 60 kg N/ha ammonium sulphate”
Claim · model-written summary
Single and double Azolla incorporations did not differ in rice grain yield.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- double Azolla incorporationse5
- Outcome
- grain yielde5
- Direction
- No significant grain yield differencese5
- Comparator
- singlee5
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e5“No significant grain yield differences were observed between the single and double Azolla incorporations”
Claim · model-written summary
Single Azolla incorporation gave a lower rice grain yield than double incorporation.
- Taxon
- riceOryza sativat0
- Material
- Azolla pinnata var. africanae0
- Treatment
- single incorporatione7
- Outcome
- yielde7
- Direction
- lowere7
- Comparator
- double incorporation of Azolla onlye6
- Setting
- Ghanat0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“The utilization of Azolla as a source of nitrogen for rice production in Ghana”
e0“The performance of the local strain of Azolla, Azolla pinnata var. africana, as a green manure for rice was compared with inorganic nitrogen alone and a combination of Azolla and inorganic nitrogen”
e6“the double incorporation of Azolla only gave a yield equivalent to that obtained under 60 kg N/ha ammonium sulphate”
e7“a lower yield was observed for the single incorporation”
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