Abstract
ABSTRACT In flood plains, cover crops are able to alter soil properties and significantly affect rice nutrition and yield. The aims of this study were to determine soil properties, plant nutrition, and yield of tropical rice cultivated on flood plains after cover crop cultivation with conventional tillage (CT) and no-tillage system (NTS) at low and high nitrogen (N) fertilization levels. The experimental design was a randomized block in a split-split-plot scheme with four replications. In the main plots were cover crops [sunhemp (Crotalaria juncea and C. spectabilis), velvet bean (Mucuna aterrima), jackbean (Canavalia ensiformis), pigeon pea (Cajanus cajan), Japanese radish (Raphanus sativus), cowpea (Vigna unguiculata)] and a fallow field. In the subplots were the tillage systems (CT or NTS). The nitrogen fertilization levels in the sub-subplots were (10 kg N ha-1 and 45 kg N ha-1). All cover crops except Japanese radish significantly increased mineral soil nitrogen and nitrate concentrations. Sunhemp, velvet bean, and cowpea significantly increased soil ammonium content. The NTS provides higher mineral nitrogen and ammonium content than that by CT. Overall, cover crops provided higher levels of nutrients to rice plants in NTS than in CT. Cover crops provide greater yield than fallow treatments. Rice yield was higher in NTS than in CT, and greater at a higher rather than lower nitrogen fertilization level.
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Claims 7
Claim · model-written summary
Cover crops except Japanese radish significantly increased mineral soil nitrogen and nitrate concentrations relative to a fallow field.
Verbatim
e0“a fallow field”
e1“All cover crops except Japanese radish significantly increased mineral soil nitrogen and nitrate concentrations”
e2“tropical rice cultivated on flood plains”
Claim · model-written summary
Sunhemp, velvet bean and cowpea significantly increased soil ammonium content relative to a fallow field.
Verbatim
e0“a fallow field”
e2“tropical rice cultivated on flood plains”
e3“Sunhemp, velvet bean, and cowpea significantly increased soil ammonium content”
Claim · model-written summary
The no-tillage system (NTS) gave higher mineral nitrogen and ammonium content than conventional tillage (CT).
Verbatim
e2“tropical rice cultivated on flood plains”
e4“The NTS provides higher mineral nitrogen and ammonium content than that by CT”
Claim · model-written summary
Cover crops gave rice higher levels of nutrients in NTS than in CT.
- Taxon
- rice
Oryza sativae5 - Treatment
- cover cropse5
- Outcome
- levels of nutrientse5
- Direction
- highere5
- Qualifier
- NTSe5
- Comparator
- CTe5
- Setting
- flood plainse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“tropical rice cultivated on flood plains”
e5“Overall, cover crops provided higher levels of nutrients to rice plants in NTS than in CT”
Claim · model-written summary
Cover crops gave greater rice yield than fallow treatments.
Verbatim
e2“tropical rice cultivated on flood plains”
e6“Cover crops provide greater yield than fallow treatments”
Claim · model-written summary
Rice yield was higher in NTS than in CT.
Verbatim
e2“tropical rice cultivated on flood plains”
e7“Rice yield was higher in NTS than in CT”
Claim · model-written summary
Rice yield was greater at the higher nitrogen fertilization level than at the lower level.
Verbatim
e2“tropical rice cultivated on flood plains”
e7“Rice yield was higher in NTS than in CT”
e3“greater at a higher rather than lower nitrogen fertilization level”
The same questions in other papers
cover crop · nutrient: content · Oryza sativa (rice)Results agree
5 papers in the same direction as this paper
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →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.