Abstract
One major limitation in tropical agriculture is the loss of productivity of soils due to continuous cultivation. This is often due to leaching losses of nutrients, erosion or crop removal. There is need to explore improving productivity of soils by using grain legumes complemented with low-use of applied nitrogen. Modern interspecific rice hybrids called New Rice for Africa (NERICA®) are low input cultivars developed to overcome environmental stresses including low soil fertility. The productivity of these NERICAs under legume/rice rotation and low-nitrogen (0 vs. 30 kgN ha-1) was evaluated in farmers’ fields in 2007 and 2008 in rainfed upland in Kasuwa Mangani (10o24’N, 7o42’E; northern Guinea savanna), and lowland at Edozhigi (09º 45′N, 06 º 7′E; southern Guinea savanna) ecologies in West Africa. Preceding plots of incorporated soybean and Mucuna after harvest, gave 33% increments in rice yield over the previous control-fallow plots in the upland ecology. While, in the lowland, plots with previously incorporated grain soybean (cv. TG× 1485 – 1D) and dual-purpose cowpea (cv. IT 98K–131–2) residues gave about 0.8 Mg ha-1 greater rice yield than plots with previous mucuna or dual-purpose soybean. Although NERICA L–42 produced over 25% more tillers and panicles than the farmers’ cultivar, both cultivars had similar yield of 3.6 Mg ha-1, possibly because of the severe effects of iron- toxicity that limited their potentials. Results showed that upland NERICA rice would perform better after soybean or mucuna rotation, and the lowland NERICA after soybean or dual-purpose cowpea cultivation than traditional fallow.
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Claims 6
Claim · model-written summary
Incorporated soybean and Mucuna residues gave 33% higher rice yield than the control-fallow plots in the upland
- Taxon
- rice
Oryza sativae1 - Treatment
- incorporated soybean and Mucunae1
- Outcome
- rice yielde1
- Direction
- incrementse1
- Value
- 33%e1
- Comparator
- control-fallow plotse1
- Setting
- rainfed upland in Kasuwa Manganie2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Preceding plots of incorporated soybean and Mucuna after harvest, gave 33% increments in rice yield over the previous control-fallow plots in the upland ecology”
e2“in farmers’ fields in 2007 and 2008 in rainfed upland in Kasuwa Mangani”
Claim · model-written summary
Previously incorporated grain soybean residues gave about 0.8 Mg ha-1 greater rice yield than mucuna or dual-purpose soybean in the lowland
- Taxon
- riceOryza sativae3
- Treatment
- previously incorporated grain soybeane3
- Outcome
- rice yielde3
- Direction
- greatere3
- Value
- 0.8 Mg ha-1e3
- Qualifier
- dual-purpose cowpea (cv. IT 98K–131–2) residuese3
- Comparator
- previous mucuna or dual-purpose soybeane3
- Setting
- lowland at Edozhigie4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“in the lowland, plots with previously incorporated grain soybean (cv. TG× 1485 – 1D) and dual-purpose cowpea (cv. IT 98K–131–2) residues gave about 0.8 Mg ha-1 greater rice yield than plots with previous mucuna or dual-purpose soybean”
e4“lowland at Edozhigi”
Claim · model-written summary
NERICA L–42 produced over 25% more tillers and panicles than the farmers’ cultivar
Verbatim
t0“NERICA rice in Rainfed Upland and Lowland Ecologies of West Africa”
e5“Although NERICA L–42 produced over 25% more tillers and panicles than the farmers’ cultivar, both cultivars had similar yield of 3.6 Mg ha-1, possibly because of the severe effects of iron- toxicity that limited their potentials”
Claim · model-written summary
NERICA L–42 and the farmers’ cultivar had similar yield of 3.6 Mg ha-1, possibly because of iron toxicity
Verbatim
t0“NERICA rice in Rainfed Upland and Lowland Ecologies of West Africa”
e5“Although NERICA L–42 produced over 25% more tillers and panicles than the farmers’ cultivar, both cultivars had similar yield of 3.6 Mg ha-1, possibly because of the severe effects of iron- toxicity that limited their potentials”
Claim · model-written summary
Upland NERICA rice would perform better after soybean or mucuna rotation than traditional fallow
Verbatim
e6“Results showed that upland NERICA rice would perform better after soybean or mucuna rotation, and the lowland NERICA after soybean or dual-purpose cowpea cultivation than traditional fallow”
Claim · model-written summary
Lowland NERICA would perform better after soybean or dual-purpose cowpea cultivation than traditional fallow
Verbatim
e6“Results showed that upland NERICA rice would perform better after soybean or mucuna rotation, and the lowland NERICA after soybean or dual-purpose cowpea cultivation than traditional fallow”
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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.