Abstract
Especially under no-tillage, subsuface soil acidity has been a problem, because it depends on base leaching, which has been associated with the presence of low molecular weigth organic acids and companion anions. The objective of this study was to evaluate exchangeable base cation leaching as affected by surface liming along with annual urea side-dressing of maize and upland rice. Treatments consisted of four lime rates (0, 1500, 3000, and 6000 kg ha-1) combined with four nitrogen rates (0, 50, 100, and 150 kg ha-1) applied to maize (Zea mays) and upland rice (Oryza sativa), in two consecutive years. Maize was planted in December, three months after liming. In September of the following year, pearl millet (Pennisetum glaucum) was planted without fertilization and desiccated 86 days after plant emergence. Afterwards, upland rice was grown. Immediately after upland rice harvest, 18 months after surface liming, pH and N-NO3-, N-NH4+, K, Ca, and Mg levels were evaluated in soil samples taken from the layers 0-5, 5-10, 10-20 and 20-40 cm. Higher maize yields were obtained at higher N rates and 3000 kg ha-1 lime. Better results for upland rice and pearl millet yields were also obtained with this lime rate, irrespective of N levels. The vertical mobility of K, Ca and Mg was higher in the soil profiles with N fertilization. Surface liming increased pH in the upper soil layers causing intense nitrate production, which was leached along with the base cations.
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Claims 7
Claim · model-written summary
Higher nitrogen rates increased maize yield.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher maize yields were obtained at higher N rates and 3000 kg ha-1 lime.”
Claim · model-written summary
A 3000 kg ha-1 lime rate gave higher maize yields.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher maize yields were obtained at higher N rates and 3000 kg ha-1 lime.”
Claim · model-written summary
The 3000 kg ha-1 lime rate improved upland rice yields regardless of nitrogen level.
- Taxon
- upland rice
Oryza sativae0 - Treatment
- 3000 kg ha-1 limee1
- Outcome
- upland ricee0
- Direction
- Bettere0
- Qualifier
- irrespective of N levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Better results for upland rice and pearl millet yields were also obtained with this lime rate, irrespective of N levels.”
e1“3000 kg ha-1 lime”
Claim · model-written summary
The 3000 kg ha-1 lime rate improved pearl millet yields regardless of nitrogen level.
- Taxon
- pearl millet
Cenchrus americanuse0 - Treatment
- 3000 kg ha-1 limee1
- Outcome
- pearl millet yieldse0
- Direction
- Bettere0
- Qualifier
- irrespective of N levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Better results for upland rice and pearl millet yields were also obtained with this lime rate, irrespective of N levels.”
e1“3000 kg ha-1 lime”
Claim · model-written summary
Nitrogen fertilization increased vertical mobility of K, Ca and Mg in soil profiles.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The vertical mobility of K, Ca and Mg was higher in the soil profiles with N fertilization.”
e1“maize (Zea mays) and upland rice (Oryza sativa)”
Claim · model-written summary
Surface liming increased pH in upper soil layers.
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surface liming increased pH in the upper soil layers”
e1“maize (Zea mays) and upland rice (Oryza sativa)”
Claim · model-written summary
Surface liming was interpreted to cause intense nitrate production and leaching with base cations.
- Treatment
- Surface liminge0
- Outcome
- intense nitrate productione0
- Qualifier
- leached along with the base cationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Surface liming increased pH in the upper soil layers causing intense nitrate production, which was leached along with the base cations.”
e1“maize (Zea mays) and upland rice (Oryza sativa)”
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