Abstract
The long-term effect of fertilizers and an integrated nutrient supply system was studied in a rice–rice sequence for 8 years at Hyderabad in India from 1988/89 to 1995/96. Nutrient uptake and seed yield improved with increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P 2 O 5 and K 2 O in the rainy and post-rainy seasons during the 8 years sequence cycles. The soil became enriched in organic carbon (OC) and maintained the available P while K concentration was reduced from medium to low status after 8 years. Integrated nutrient supply by incorporating glyricidia or FYM 15 days before transplanting the rice thereby substituting 25% nitrogen in the rainy season and application of only 75% of the recommended fertilizers in the post-rainy season maintained the overall mean yield at a level equal to that from the continuous application of the recommended fertilizer dose. The practice saved 30 kg N, 15 kg P 2 O 5 and 10 kg K 2 O/ha in every season and improved the OC% and available P of the soil. The overall mean production of rice grain following the substitution of 50% nitrogen with glyricidia in the rainy season and fertilizer application at the recommended dose in the post-rainy season was also equal to that given by the application of the recommended fertilizer dose applied in every season and increased the OC% and available P of the soil. This procedure reduced the fertilizer dose in the rainy season by 60 kg N, 30 kg P 2 O 5 and 20 kg K 2 O/ha.
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Claims 10
Claim · model-written summary
Rice nutrient uptake improved as fertilizer increased to the recommended dose.
- Taxon
- rice
Oryza sativat0 - Treatment
- increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P 2 O 5 and K 2 Oe0
- Outcome
- Nutrient uptakee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutrient uptake and seed yield improved with increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P 2 O 5 and K 2 O”
t0“rice”
Claim · model-written summary
Rice seed yield improved as fertilizer increased to the recommended dose.
- Taxon
- riceOryza sativat0
- Treatment
- increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P 2 O 5 and K 2 Oe0
- Outcome
- seed yielde0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nutrient uptake and seed yield improved with increase in fertilizers up to the recommended dose of 120, 60, 40 kg/ha, N, P 2 O 5 and K 2 O”
t0“rice”
Claim · model-written summary
Soil organic carbon became enriched after eight years.
- Taxon
- riceOryza sativat0
- Outcome
- soil became enriched in organic carbon (OC)e0
- Direction
- enrichede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil became enriched in organic carbon (OC) and maintained the available P while K concentration was reduced from medium to low status after 8 years”
t0“rice”
Claim · model-written summary
Available soil phosphorus was maintained after eight years.
- Taxon
- riceOryza sativat0
- Outcome
- available Pe0
- Direction
- maintainede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“maintained the available P while K concentration was reduced from medium to low status after 8 years”
t0“rice”
Claim · model-written summary
Soil potassium fell from medium to low status after eight years.
- Taxon
- riceOryza sativat0
- Outcome
- K concentratione0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“K concentration was reduced from medium to low status after 8 years”
t0“rice”
Claim · model-written summary
Substituting 25% nitrogen with glyricidia or FYM maintained rice yield equal to continuous recommended fertilizer.
- Taxon
- riceOryza sativae0
- Treatment
- substituting 25% nitrogen in the rainy season and application of only 75% of the recommended fertilizers in the post-rainy seasone0
- Outcome
- overall mean yielde0
- Direction
- equale0
- Comparator
- continuous application of the recommended fertilizer dosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Integrated nutrient supply by incorporating glyricidia or FYM 15 days before transplanting the rice thereby substituting 25% nitrogen in the rainy season and application of only 75% of the recommended fertilizers in the post-rainy season maintained the overall mean yield at a level equal to that from the continuous application of the recommended fertilizer dose”
Claim · model-written summary
The 25% substitution saved fertilizer and improved soil organic carbon and available phosphorus.
- Taxon
- riceOryza sativat0
- Outcome
- OC% and available P of the soile0
- Direction
- improvede0
- Value
- 30 kg N, 15 kg P 2 O 5 and 10 kg K 2 O/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The practice saved 30 kg N, 15 kg P 2 O 5 and 10 kg K 2 O/ha in every season and improved the OC% and available P of the soil”
t0“rice”
Claim · model-written summary
Replacing 50% of rainy-season nitrogen with glyricidia maintained grain production equal to recommended fertilizer in every season.
- Taxon
- riceOryza sativae0
- Treatment
- substitution of 50% nitrogen with glyricidia in the rainy seasone0
- Outcome
- overall mean production of rice graine0
- Direction
- equale0
- Comparator
- application of the recommended fertilizer dose applied in every seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“overall mean production of rice grain following the substitution of 50% nitrogen with glyricidia in the rainy season and fertilizer application at the recommended dose in the post-rainy season was also equal to that given by the application of the recommended fertilizer dose applied in every season”
Claim · model-written summary
The 50% substitution increased soil organic carbon and available phosphorus.
- Taxon
- riceOryza sativat0
- Outcome
- OC% and available P of the soile0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the OC% and available P of the soil”
t0“rice”
Claim · model-written summary
The 50% substitution reduced the rainy-season fertilizer dose.
- Taxon
- riceOryza sativat0
- Outcome
- fertilizer dosee0
- Direction
- reducede0
- Value
- 60 kg N, 30 kg P 2 O 5 and 20 kg K 2 O/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This procedure reduced the fertilizer dose in the rainy season by 60 kg N, 30 kg P 2 O 5 and 20 kg K 2 O/ha”
t0“rice”
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