Abstract
The grain yield of upland rice under no-tillage has been unsatisfactory and one reason could be the nitrate/ammonium balance in the soil. Cover crops and nitrogen fertilization can be used to change the nitrate/ammonium relation in the soil and improve conditions for the development of upland rice in the no-tillage (NT) system. The aim was to study the effect of cover crops and nitrogen sources on grain yield of upland rice under no tillage. The study was carried out on the Fazenda Experimental Lageado, in Botucatu, State of São Paulo, Brazil, in an Oxisol area under no-tillage for six years. The experiment was arranged in a randomized block split-plot design with four replications. The plots consisted of six cover crop species (Brachiaria brizantha, B. decumbens, B. humidicola, B. ruziziensis, Pennisetum americanum, and Crotalaria spectabilis) and the split-plots of seven forms of N fertilizer management. Millet is the best cover crop to precede upland rice under NT. The best form of N application, as nitrate, is in split rates or total rate at topdressing or an ammonium source with or without a nitrification inhibitor, in split doses. When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.
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Claims 8
Claim · model-written summary
Millet was the best cover crop preceding upland rice under no tillage.
- Taxon
- upland rice
Oryza sativae0 - Treatment
- Millete0
- Outcome
- best cover crop to precede upland rice under NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Millet is the best cover crop to precede upland rice under NT.”
Claim · model-written summary
Nitrate in split rates or topdressed total rate was a preferred N application.
- Taxon
- Upland riceOryza sativat0
- Treatment
- nitratee0
- Outcome
- best form of N applicatione0
- Qualifier
- split rates or total rate at topdressinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“The best form of N application, as nitrate, is in split rates or total rate at topdressing”
Claim · model-written summary
Ammonium source with or without inhibitor in split doses was a preferred N application.
- Taxon
- Upland riceOryza sativat0
- Outcome
- an ammonium source with or without a nitrification inhibitor, in split dosese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“an ammonium source with or without a nitrification inhibitor, in split doses.”
Claim · model-written summary
C. spectabilis preceding rice gave highest grain yield with ammonium sulfate plus inhibitor.
- Taxon
- riceOryza sativae0
- Treatment
- C. spectabilise0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.”
Claim · model-written summary
B. brizantha preceding rice gave highest grain yield with ammonium sulfate plus inhibitor.
- Taxon
- riceOryza sativae0
- Treatment
- B. brizanthae0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.”
Claim · model-written summary
B. decumbens preceding rice gave highest grain yield with ammonium sulfate plus inhibitor.
- Taxon
- riceOryza sativae0
- Treatment
- B. decumbense0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.”
Claim · model-written summary
B. humidicola preceding rice gave highest grain yield with ammonium sulfate plus inhibitor.
- Taxon
- riceOryza sativae0
- Treatment
- B. humidicolae0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.”
Claim · model-written summary
B. ruziziensis preceding rice gave highest grain yield with ammonium sulfate plus inhibitor.
- Taxon
- riceOryza sativae0
- Treatment
- B. ruziziensise0
- Outcome
- grain yielde0
- Direction
- higheste0
- Qualifier
- ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Upland rice”
e0“When the cover crops C. spectabilis, B. brizantha, B. decumbens, B. humidicola, and B. ruziziensis preceded rice, they induced the highest grain yield when rice was fertilized with N as ammonium sulfate source + nitrification inhibitor in split rates or total dose at topdressing.”
The same questions in other papers
Crotalaria spectabilis · yield · Oryza sativa (rice)Positive and negative results
1 in the opposite direction
- negative
Urochloa brizantha · yield · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →Urochloa ruziziensis · yield · Oryza sativa (rice)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.