Abstract
Field experiments were carried out for 3 years to assess the effect of using drip irrigation on the growth and yield of two Japanese soybean cultivars in Kagawa Prefecture, which has the second-lowest rainfall in Japan. The treatments were drip irrigation (Drip) and rainfed (Rainfed) from the blooming stage to the full-seed stage. The largest seed yield was achieved in 2017, followed by 2018 and 2016. This order corresponded to the total water input (TWI, the sum of effective rainfall and irrigation) throughout cultivation. TWI was the main factor affecting the variation of yield and its components among years. Similarly, the higher TWI in Drip than in Rainfed contributed to the higher yield in Drip than in Rainfed within each year. ANOVA detected a significant effect of drip irrigation on total seed yield, above-ground dry matter (AGDM) at maturity, and numbers of branches, nodes, and fertile pods. AGDM had a significant correlation with the mean crop growth rate (CGR) during the treatment, and CGR was closely correlated with the mean net assimilation rate (NAR). Significant positive correlation among NAR, radiation use efficiency, and leaf water potential suggested that drip irrigation prevented the decrease of plant water status that contributed to maintain dry matter production. The advantage of using drip irrigation for soybean cultivation at the experiment site would be suppressing the decrease in yield in years with low rainfall rather than achieving higher yield than standard in years with normal or high rainfall. Abbreviations: AGDM, aboveground dry matter; CGR, crop growth rate; CISR, cumulative intercepted solar radiation; DAS, days after sowing; ETa, actual evapotranspiration; ETr, reference evapotranspiration; FIPAR, fraction of intercepted photosynthetically active radiation; LAI, leaf area index; ΨL, leaf water potential; mLAI, mean leaf area index; NAR, net assimilation rate; PAR, photosynthetically active radiation; PCC, percent of canopy coverage; RUE, radiation use efficiency; TWI, total water input
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Claims 11
Claim · model-written summary
Seed yield ranked 2017 above 2018 above 2016 and tracked total water input.
- Taxon
- soybean
Glycine maxt0 - Outcome
- seed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest seed yield was achieved in 2017, followed by 2018 and 2016. This order corresponded to the total water input (TWI, the sum of effective rainfall and irrigation) throughout cultivation.”
t0“soybean”
Claim · model-written summary
Total water input was the main factor in between-year yield and component variation.
- Taxon
- soybeanGlycine maxt0
- Outcome
- yield and its componentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TWI was the main factor affecting the variation of yield and its components among years.”
t0“soybean”
Claim · model-written summary
Drip irrigation had higher yield than rainfed cultivation within each year, associated with higher water input.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the higher TWI in Drip than in Rainfed contributed to the higher yield in Drip than in Rainfed within each year.”
t0“soybean”
Claim · model-written summary
Drip irrigation significantly affected total seed yield.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drip irrigatione0
- Outcome
- total seed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ANOVA detected a significant effect of drip irrigation on total seed yield, above-ground dry matter (AGDM) at maturity, and numbers of branches, nodes, and fertile pods.”
t0“soybean”
Claim · model-written summary
Drip irrigation significantly affected above-ground dry matter at maturity.
- Taxon
- soybeanGlycine maxt0
- Outcome
- above-ground dry matter (AGDM) at maturitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ANOVA detected a significant effect of drip irrigation on total seed yield, above-ground dry matter (AGDM) at maturity, and numbers of branches, nodes, and fertile pods.”
t0“soybean”
Claim · model-written summary
Drip irrigation significantly affected numbers of branches, nodes, and fertile pods.
- Taxon
- soybeanGlycine maxt0
- Outcome
- numbers of branches, nodes, and fertile podse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ANOVA detected a significant effect of drip irrigation on total seed yield, above-ground dry matter (AGDM) at maturity, and numbers of branches, nodes, and fertile pods.”
t0“soybean”
Claim · model-written summary
Above-ground dry matter correlated significantly with crop growth rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- mean crop growth rate (CGR)e0
- Outcome
- AGDMe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AGDM had a significant correlation with the mean crop growth rate (CGR) during the treatment”
t0“soybean”
Claim · model-written summary
Crop growth rate closely correlated with net assimilation rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- mean net assimilation rate (NAR)e0
- Outcome
- CGRe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CGR was closely correlated with the mean net assimilation rate (NAR).”
t0“soybean”
Claim · model-written summary
Net assimilation rate, radiation use efficiency, and leaf water potential were positively correlated.
- Taxon
- soybeanGlycine maxt0
- Outcome
- NAR, radiation use efficiency, and leaf water potentiale0
- Direction
- positivee0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant positive correlation among NAR, radiation use efficiency, and leaf water potential”
t0“soybean”
Claim · model-written summary
The authors infer that drip irrigation maintains dry matter production by preventing decline in plant water status.
- Taxon
- soybeanGlycine maxt0
- Treatment
- drip irrigatione0
- Outcome
- dry matter productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drip irrigation prevented the decrease of plant water status that contributed to maintain dry matter production.”
t0“soybean”
Claim · model-written summary
The authors conclude that drip irrigation at this site chiefly suppresses yield decreases in low-rainfall years.
- Taxon
- soybeanGlycine maxe0
- Outcome
- suppressing the decrease in yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The advantage of using drip irrigation for soybean cultivation at the experiment site would be suppressing the decrease in yield in years with low rainfall rather than achieving higher yield than standard in years with normal or high rainfall.”