Abstract
Compost application can enhance soil fertility and is consequently presumed to increase crop production in Japan’s paddy-upland rotation fields. This study aimed to evaluate the effects of rice straw compost (RSC) application on available soil nitrogen (Av-N) levels and rice and soybean plants in a paddy-upland rotation field using data obtained from a long-term field experiment. Data collected between 2005 and 2020 were analyzed from a long-term paddy rice – upland soybean rotation field. The experimental design employed a split-plot arrangement, with RSC application (with and without RSC) representing the whole plot, N fertilizer application (no nitrogen vs. standard fertilizer) representing the split-plot, and years representing the replication factor. The datasets included eight years of rice and soybean cultivation, and the chemical properties of postharvest soil spanned 16 years. The data was analyzed via analysis of variance. Applying RSC increased the Av-N concentration significantly by 63%–67%. The RSC application significantly increased the N concentration in rice shoots at the mature stage by 8%–12% but decreased it in soybean shoots after the seed emergence stage by 4%–8%. Consequently, the rice yield displayed clear responses to RSC application, whereas the soybean yield did not. The lack of soybean yield response might be due to an inhibitory effect of the Av-N gain attributable to the RSC application on biological nitrogen fixation. While applying compost can enhance Av-N content as well as rice productivity in paddy-upland rotation fields, its impact on soybean productivity requires careful evaluation.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Rice straw compost increased available soil nitrogen significantly by 63%–67%.
- Taxon
- rice
Oryza sativat0 - Treatment
- Applying RSCe0
- Outcome
- Av-N concentratione0
- Direction
- increasede0
- Value
- 63%–67%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice, and soybeans”
e0“Applying RSC increased the Av-N concentration significantly by 63%–67%”
Claim · model-written summary
Rice straw compost increased mature rice shoot N concentration significantly by 8%–12%.
- Taxon
- riceOryza sativae0
- Organ / stage
- rice shoots at the mature stagee0
- Treatment
- RSC applicatione0
- Outcome
- N concentratione0
- Direction
- increasede0
- Value
- 8%–12%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RSC application significantly increased the N concentration in rice shoots at the mature stage by 8%–12%”
Claim · model-written summary
Rice straw compost decreased soybean shoot N concentration after seed emergence by 4%–8%.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- soybean shoots after the seed emergence stagee0
- Treatment
- RSC applicatione0
- Outcome
- N concentratione0
- Direction
- decreasede0
- Value
- 4%–8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RSC application significantly increased the N concentration in rice shoots at the mature stage by 8%–12% but decreased it in soybean shoots after the seed emergence stage by 4%–8%”
Claim · model-written summary
Rice yield showed clear responses to compost application.
- Taxon
- riceOryza sativae0
- Treatment
- RSC applicatione0
- Outcome
- rice yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rice yield displayed clear responses to RSC application”
Claim · model-written summary
Soybean yield did not respond to compost application.
- Taxon
- soybeanGlycine maxe0
- Treatment
- RSC applicatione1
- Outcome
- soybean yielde0
- Direction
- did note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the soybean yield did not”
e1“responses to RSC application, whereas the soybean yield did not”
Claim · model-written summary
The authors suggested increased available soil N from compost might inhibit biological nitrogen fixation and explain the lack of soybean yield response.
- Taxon
- soybeanGlycine maxe1
- Treatment
- RSC applicatione0
- Outcome
- lack of soybean yield responsee0
- Qualifier
- inhibitory effect of the Av-N gaine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lack of soybean yield response might be due to an inhibitory effect of the Av-N gain attributable to the RSC application on biological nitrogen fixation”
e1“soybean plants”
Claim · model-written summary
The authors recommend careful evaluation of compost effects on soybean productivity.
- Taxon
- soybeanGlycine maxe1
- Outcome
- impact on soybean productivity requires careful evaluatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its impact on soybean productivity requires careful evaluation”
e1“soybean plants”
The same questions in other papers
Oryza sativa · nutrient: content · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Oryza sativa · yield · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 20 in the opposite direction
- positive
- positive
- positive
20 papers more in this group
See all 24 papers →fertilization · soil: chemistry · Oryza sativa (rice)Positive and negative results
279 papers in the same direction as this paper · 23 in the opposite direction · 2 reporting no difference from an alternative
- positive
- no effect
- no effect
301 papers more in this group
See all 305 papers →fertilization · nutrient: content · Glycine max (soybean)Positive and negative results
44 papers in the same direction as this paper · 265 in the opposite direction
- positive
- positive
- positive
306 papers more in this group
See all 310 papers →fertilization · nutrient: content · Oryza sativa (rice)Positive and negative results
931 papers in the same direction as this paper · 56 in the opposite direction · 5 reporting no difference from an alternative
- positive
- negative
- no effect
989 papers more in this group
See all 993 papers →fertilization · yield · Glycine max (soybean)Positive and negative results
170 papers in the same direction as this paper · 1,021 in the opposite direction
- positive
- positive
- positive
1,188 papers more in this group
See all 1,192 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.